Crystal structures of potassium tri­fluorido­(4-meth­oxy­phen­yl)borate and potassium tri­fluorido(4-fluoro­phen­yl)borate

Harrison, W.T.A.; Wardell, J.L.

doi:10.1107/S1600536814009684

research communications

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ISSN: 2056-9890

Volume 70| Part 8| August 2014| Pages 68-71

doi:10.1107/S1600536814009684

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Crystal structures of potassium trifluorido(4-methoxyphenyl)borate and potassium trifluorido(4-fluorophenyl)borate

William T. A. Harrison ^a ^* and James L. Wardell ^a,^b

^aDepartment of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, Scotland, and ^bFioCruz-Fundação Oswaldo Cruz, Instituto de Tecnologia em Fármacos-Far-Manguinhos, Rua Sizenando Nabuco, 100, Manguinhos, 21041-250 Rio de Janeiro, RJ, Brazil
^*Correspondence e-mail: w.harrison@abdn.ac.uk

Edited by M. Weil, Vienna University of Technology, Austria (Received 16 April 2014; accepted 29 April 2014; online 19 July 2014)

The title compounds, K⁺·C₇H₇BF₃O⁻, (I), and K⁺·C₆H₄BF₄⁻, (II), are molecular salts containing para-substituted phenyltrifluoridoborate anions. In each compound, the B atom adopts a distorted tetrahedral BCF₃ geometry. Despite their different compositions and space groups, the irregular KF₈ coordination polyhedra of the potassium cations in the structures are almost identical. These polyhedra share faces and edges, generating infinite (010) layers in (I) and infinite (001) layers in (II). In (I), adjacent layers are stacked in an AAA… fashion, whereas in (II), they are stacked in an ABAB… sequence.

Keywords: crystal structure; boron; Lewis acid; layered structure.

CCDC references: 1004280; 1004281

1. Chemical context

The phenyltrifluoridoborate anion is an interesting intermediate species between the well-known tetrafluoridoborate (BF₄⁻) and tetraphenylborate [B(C₆H₅)₄⁻] ions (Conole et al., 1995 ) and may serve as a bulky charge-balancing anion (Quach et al., 2001 ; Fei et al., 2010 ). As part of our studies in this area, we now describe the syntheses and structures of the para-substituted phenyltrifluoridoborate salts K⁺C₇H₇BF₃O⁻ (I) and K⁺C₆H₄BF₄⁻ (II).

2. Structural commentary

Compound (I) comprises one cation and one anion in the asymmetric unit (Fig. 1). In the anion, the C7 atom of the methoxy group is close to coplanar with the benzene ring [displacement = 0.048 (2) Å]. The B atom adopts its expected tetrahedral BF₃C geometry (Conole et al., 1995) and the C1—B1 bond length of 1.5987 (18) Å is consistent with previous data (Quach et al., 2001). One of the B—F bonds (to F1) in (I) is notably longer than the other two, which might reflect the different modes of coordination of the fluorine atoms to the potassium ions. The F—B—F bond angles (mean = 105.7°) are significantly smaller than the C—B—F angles (mean = 113.0°). F1 is displaced by −1.427 (2) Å from the plane of the benzene ring and F2 and F3 are displaced in the opposite sense, by 0.715 (2) and 0.252 (2) Å, respectively.

Figure 1
The asymmetric unit of (I)

showing 50% displacement ellipsoids.

The potassium ion in (I) is coordinated by eight fluorine atoms, with one of the K—F bonds substantially longer than the others (Table 1): the next-nearest F atom is over 4 Å distant. The coordination geometry of the K⁺ ion, which arises from one tridentate, one bidentate and three monodentate BF₃⁻ groups, is irregular and highly asymmetric (Fig. 2), with five of the F atoms forming an approximate plane and the other three (arising from one BF₃ group) lying to one side. The metal ion is displaced by 1.00 Å from the geometric centroid of the eight F atoms. In terms of the F atoms in (I), F1 bonds to three different metal ions (mean K—F = 2.734 Å), generating a distorted FBK₃ tetrahedron, whereas F2 bonds to two K⁺ ions (mean K—F = 2.755 Å) in an FBK₂ distorted T-shape. If the geometry around F3 is not merely deemed to be irregular, it could be described as an FBK₃ trigonal-based pyramid, with the long K—F bond (Table 1) as the apex (mean K—F = 2.963 Å). The extended structure in (I) consists of (010) sheets in which the KF₈ polyhedra share faces in the [100] direction and edges in [001]: the shortest K⋯K separation is 4.4523 (4) Å.

Table 1
Selected bond lengths (Å) for (I)

K1—F3ⁱ	2.6156 (10)	K1—F2^iv	2.8885 (8)
K1—F2ⁱⁱ	2.6211 (7)	K1—F3^iv	3.4886 (9)
K1—F1ⁱⁱⁱ	2.6550 (10)	B1—F3	1.4162 (19)
K1—F1^iv	2.7568 (10)	B1—F2	1.4196 (14)
K1—F3	2.7836 (8)	B1—F1	1.4403 (17)
K1—F1	2.7887 (8)
Symmetry codes: (i) $[-x+{\script{3\over 2}}, y, z-{\script{1\over 2}}]$ ; (ii) x+1, y, z; (iii) $[-x+{\script{3\over 2}}, y, z+{\script{1\over 2}}]$ ; (iv) $[x+{\script{1\over 2}}, -y+1, z]$ .

Figure 2
The coordination of the potassium ion in (I)

. See Table 1

for symmetry codes.

The asymmetric unit of compound (II) also consists of an ion-pair (Fig. 3). The geometry of the anion in (II) is very similar to that of the equivalent species in (I): the C1—B1 bond length is 1.590 (2) Å and the mean F—B—F and C—B—F bond angles are 105.5 and 113.2°, respectively. The displacements of F1, F2 and F3 from the benzene-ring plane are −1.386 (2), 0.813 (3) and 0.131 (3) Å, respectively. As seen for (I), the B1—F1 bond in (II) is noticeably longer than the B1—F2 and B1—F3 bonds.

Figure 3
The asymmetric unit of (II)

showing 50% displacement ellipsoids.

It is notable that the K⁺ ion in (II) adopts a very similar coordination geometry (Table 2) to the equivalent species in (I), despite the different space groups. Again, a very asymmetric KF₈ coordination polyhedron (Fig. 4) arises from one tridentate, one bidentate and three monodentate anions; one K—F bond is much longer than the others and the potassium ion is displaced by 0.98 Å from the geometric centroid of the fluorine atoms.

Table 2
Selected bond lengths (Å) for (II)

K1—F3ⁱ	2.6116 (10)	K1—F2^iv	2.8853 (10)
K1—F2ⁱⁱ	2.6159 (9)	K1—F3^iv	3.3927 (10)
K1—F1ⁱⁱⁱ	2.6527 (9)	B1—F2	1.4166 (17)
K1—F1^iv	2.7612 (10)	B1—F3	1.4182 (19)
K1—F3	2.7732 (9)	B1—F1	1.4393 (18)
K1—F1	2.8050 (9)
Symmetry codes: (i) $[-x+{\script{1\over 2}}, y+{\script{1\over 2}}, z]$ ; (ii) x-1, y, z; (iii) $[-x+{\script{1\over 2}}, y-{\script{1\over 2}}, z]$ ; (iv) $[x-{\script{1\over 2}}, y, -z+{\script{1\over 2}}]$ .

Figure 4
The coordination of the potassium ion in (II)

. See Table 2

for symmetry codes.

The extended structure of (II) consists of (001) sheets [rather than (010) sheets, as seen in (I)] of face- and edge-sharing KF₈ groups with the same topology as in (I): the shortest K⋯K separation is 4.4255 (5) Å.

3. Supramolecular features

In (I) the methoxyphenyl groups lie roughly normal to (010). When the packing is viewed along [101] (Fig. 5), it may be seen that adjacent benzene ring planes are rotated by 90°, which facilitates the formation of a weak edge-to-face intra-sheet C—H⋯π interaction (Table 3). An intra-sheet C2—H2⋯F2 hydrogen bond also occurs. The only possible inter-sheet interaction in (I) is an extremely weak C—H⋯O hydrogen bond with an H⋯O separation essentially the same as the van der Waals separation of these species. The layer-stacking sequence for (I) is AAA….

Table 3
Hydrogen-bond geometry (Å, °) for (I)

Cg1 is the centroid of the C1–C6 benzene ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C2—H2⋯F2^v	0.95	2.50	3.3359 (17)	147
C7—H7a⋯O1^vi	0.98	2.72	3.496 (1)	137
C3—H3⋯Cg1^v	0.95	2.85	3.7171 (15)	152
Symmetry codes: (v) $[-x+{\script{1\over 2}}, y, z-{\script{1\over 2}}]$ ; (vi) $[-x+1, -y+2, z-{\script{1\over 2}}]$ .

Figure 5
The unit-cell packing in (I)

viewed approximately down [101].

When the crystal structure of (II) is viewed down [110] (Fig. 6), adjacent aromatic rings show the same 90° rotation as they do in (I), but the only directional interaction identified is an intralayer weak C—H⋯F hydrogen bond (Table 4) and there are no C—H⋯π interactions. There are no identified inter-layer interactions and the stacking sequence is ABAB….

Table 4
Hydrogen-bond geometry (Å, °) for (II)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C6—H6⋯F2^v	0.95	2.53	3.4099 (19)	154
Symmetry code: (v) $[-x+{\script{3\over 2}}, y+{\script{1\over 2}}, z]$ .

Figure 6
The unit-cell packing in (II)

viewed approximately down [110].

4. Database survey

Compound (I) is closely related to K^+.C₆H₅BF₃⁻ (Conole et al., 1995), (III). Compounds (I) and (III) have the same space group and a similar unit cell, extended in the b-axis direction for (I) to accommodate the methoxy group. The potassium ion in (III) has almost the same KF₈ coordination geometry as the equivalent species in (I) and (II) described above. In (III), weak edge-to-face C—H⋯π interactions occur between approximately perpendicular aromatic rings, as they do in (I). As already noted, the C₆H₅BF₃⁻ anion has found use as a bulky charge-balancing species (Quach et al., 2001; Fei et al., 2010).

5. Synthesis and crystallization

(I) and (II) were received as commercial samples from Aldrich and recrystallized from ethanol solution, yielding colourless blocks.

6. Refinement

The H atoms were placed in idealized positions (C—H = 0.95–0.98 Å) and refined as riding atoms with U_iso(H) = 1.2U_eq(C) or 1.5U_eq(methyl C). The methyl group in (I) was allowed to rotate, but not to tip, to best fit the electron density.. Experimental details are given in Table 5.

Table 5
Experimental details

	(I)	(II)
Crystal data
Chemical formula	K⁺·C₇H₇BF₃O⁻	K⁺·C₆H₄BF₄⁻
M_r	214.04	202.00
Crystal system, space group	Orthorhombic, Pca2₁	Orthorhombic, Pbca
Temperature (K)	120	100
a, b, c (Å)	7.1347 (2), 17.2819 (7), 7.3289 (3)	7.1317 (5), 7.3757 (5), 29.129 (2)
V (Å³)	903.66 (6)	1532.22 (18)
Z	4	8
Radiation type	Mo Kα	Mo Kα
μ (mm⁻¹)	0.59	0.70
Crystal size (mm)	0.52 × 0.15 × 0.15	0.07 × 0.05 × 0.01

Data collection
Diffractometer	Rigaku CCD	Rigaku CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2012 )	Multi-scan (SADABS; Bruker, 2012)
T_min, T_max	0.750, 0.917	0.953, 0.993
No. of measured, independent and observed [I > 2σ(I)] reflections	5789, 1833, 1822	9537, 1726, 1435
R_int	0.026	0.037
(sin θ/λ)_max (Å⁻¹)	0.649	0.649

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.021, 0.059, 1.10	0.027, 0.065, 1.06
No. of reflections	1833	1726
No. of parameters	120	109
No. of restraints	1	0
H-atom treatment	H-atom parameters constrained	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.24, −0.20	0.27, −0.23
Absolute structure	Flack (1983 ), 712 Friedel pairs	–
Absolute structure parameter	0.02 (3)	–
Computer programs: CrystalClear (Rigaku, 2010 ), SHELXS97 and SHELXL97 (Sheldrick, 2008 ), ORTEP-3 for Windows (Farrugia, 2012 ) and publCIF (Westrip, 2010 ).

Supporting information

CCDC references: 1004280; 1004281

Crystal structure: contains datablocks I, II, global. DOI: 10.1107/S1600536814009684/wm0001sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536814009684/wm0001Isup2.hkl

Structure factors: contains datablock II. DOI: 10.1107/S1600536814009684/wm0001IIsup3.hkl

checkCIF report

Chemical context top

The phenyltrifluoridoborate anion is an interesting intermediate species between the well-known tetrafluoridoborate (BF₄^-) and tetraphenylborate [B(C₆H₅)₄^-] ions (Conole et al., 1995) and may serve as a bulky charge-balancing anion (Quach et al., 2001; Fei et al., 2010). As part of our studies in this area, we now describe the syntheses and structures of the para-substituted phenyltrifluoridoborate salts K⁺C₇H₇BF₃O^- (I) and K⁺C₆H₄BF₄^- (II).

Structural commentary top

Compound (I) comprises one cation and one anion in the asymmetric unit (Fig. 1). In the anion, the C7 atom of the methoxy group is close to coplanar with the benzene ring [displacement = 0.048 (2) Å]. The B atom adopts its expected tetrahedral BF₃C geometry (Conole et al., 1995) and the C1—B1 bond length of 1.5987 (18) Å is consistent with previous data (Quach et al., 2001). One of the B—F bonds (to F1) in (I) is notably longer than the other two, which might reflect the different modes of coordinations of the fluorine atoms to the potassium ions. The F—B—F bond angles (mean = 105.7°) are significantly smaller than the C—B—F angles (mean = 113.0°). F1 is displaced by -1.427 (2) Å from the plane of the benzene ring and F2 and F3 are displaced in the opposite sense, by 0.715 (2) and 0.252 (2) Å, respectively.

The potassium ion in (I) is coordinated by eight fluorine atoms, with one of the K—F bonds substantially longer than the others (Table 2): the next-nearest F atom is over 4 Å distant. The coordination geometry of the K⁺ ion, which arises from one tridentate, one bidentate and three monodentate BF₃^- groups, is irregular and highly asymmetric (Fig. 2), with five of the F atoms forming an approximate plane and the other three (arising from one BF₃ group) lying to one side. The metal ion is displaced by 1.00 Å from the geometric centroid of the eight F atoms. In terms of the F atoms in (I), F1 bonds to three different metal ions (mean K—F = 2.734 Å), generating a distorted FBK₃ tetrahedron, whereas F2 bonds to two K⁺ ions (mean K—F = 2.755 Å) in an FBK₂ distorted T-shape. If the geometry around F3 is not merely deemed to be irregular, it could be described as an FBK₃ trigonal-based pyramid, with the long K—F bond (Table 1) as the apex (mean K—F = 2.963 Å). The extended structure in (I) consists of (010) sheets in which the KF₈ polyhedra share faces in the [100] direction and edges in [001]: the shortest K···K separation is 4.4523 (4) Å.

The asymmetric unit of compound (II) also consists of an ion-pair (Fig. 3). The geometry of the anion in (II) is very similar to that of the equivalent species in (I): the C1—B1 bond length is 1.590 (2) Å and the mean F—B—F and C—B—F bond angles are 105.5 and 113.2°, respectively. The displacements of F1, F2 and F3 from the benzene-ring plane are –1.386 (2), 0.813 (3) and 0.131 (3) Å, respectively. As seen for (I), the B1—F1 bond in (II) is noticeably longer than the B1—F2 and B1—F3 bonds.

It is notable that the K⁺ ion in (II) adopts a very similar coordination geometry (Table 3) to the equivalent species in (I), despite the different space groups. Again, a very asymmetric KF₈ coordination polyhedron (Fig. 4) arises from one tridentate, one bidentate and three monodentate anions; one K—F bond is much longer than the others and the potassium ion is displaced by 0.98 Å from the geometric centroid of the fluorine atoms.

Supramolecular features top

In (I) the methoxyphenyl groups lie roughly normal to (010). When the packing is viewed along [101] (Fig. 5), it may be seen that adjacent benzene ring planes are rotated by 90°, which facilitates the formation of a weak edge-to-face intra-sheet C—H···π interaction (Table 4). An intra-sheet C2—H2···F2 hydrogen bond also occurs. The only possible inter-sheet interaction in (I) is an extremely weak C—H···O hydrogen bond with an H···O separation essentially the same as the van der Waals separation of these species. The layer-stacking sequence for (I) is AAA··· .

When the crystal structure of (II) is viewed down [110] (Fig. 6), adjacent aromatic rings show the same 90° rotation as they do in (I), but the only directional interaction identified is an intralayer weak C—H···F hydrogen bond (Table 5) and there are no C—H···π interactions. There are no identified inter-layer interactions and the stacking sequence is ABAB··· .

Database survey top

Compound (I) is closely related to K^+.C₆H₅BF₃^- (Conole et al., 1995) (III). Compounds (I) and (III) have the same space group and a similar unit cell, extended in the b-axis direction for (I) to accommodate the methoxy group. The potassium ion in (III) has almost the same KF₈ coordination geometry as the equivalent species in (I) and (II) described above. In (III), weak edge-to-face C—H···π interactions occur between approximately perpendicular aromatic rings, as they do in (I). As already noted, the C₆H₅BF₃^- anion has found use as a bulky charge-balancing species (Quach et al., 2001; Fei et al., 2010).

Synthesis and crystallization top

(I) and (II) were received as commercial samples from Aldrich and recrystallized from ethanol solution, yielding colourless blocks.

Refinement top

Related literature top

For related literature, see: Conole et al. (1995); Fei et al. (2010); Quach et al. (2001).

Computing details top

For both compounds, data collection: CrystalClear (Rigaku, 2010); cell refinement: CrystalClear (Rigaku, 2010); data reduction: CrystalClear (Rigaku, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: publCIF (Westrip, 2010).

Figures top

	Fig. 1. The asymmetric unit of (I) showing 50% displacement ellipsoids.
	Fig. 2. The coordination of the potassium ion in (I). See Table 2 for symmetry codes.
	Fig. 3. The asymmetric unit of (II) showing 50% displacement ellipsoids.
	Fig. 4. The coordination of the potassium ion in (II). See Table 3 for symmetry codes.
	Fig. 5. The unit-cell packing in (I) viewed approximately down [101].
	Fig. 6. The unit-cell packing in (II) viewed approximately down [110].

(I) Potassium trifluorido(4-methoxyphenyl)borate top

Crystal data top

K⁺·C₇H₇BF₃O⁻	D_x = 1.573 Mg m⁻³
M_r = 214.04	Mo Kα radiation, λ = 0.71075 Å
Orthorhombic, Pca2₁	Cell parameters from 4830 reflections
a = 7.1347 (2) Å	θ = 1.2–27.5°
b = 17.2819 (7) Å	µ = 0.59 mm⁻¹
c = 7.3289 (3) Å	T = 120 K
V = 903.66 (6) Å³	Block, colourless
Z = 4	0.52 × 0.15 × 0.15 mm
F(000) = 432

Data collection top

Rigaku CCD diffractometer	1833 independent reflections
Radiation source: fine-focus sealed tube	1822 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.026
ω scans	θ_max = 27.5°, θ_min = 1.2°
Absorption correction: multi-scan (SADABS; Bruker, 2012)	h = −9→9
T_min = 0.750, T_max = 0.917	k = −22→20
5789 measured reflections	l = −8→9

Refinement top

Refinement on F²	Hydrogen site location: inferred from neighbouring sites
Least-squares matrix: full	H-atom parameters constrained
R[F² > 2σ(F²)] = 0.021	w = 1/[σ²(F_o²) + (0.035P)² + 0.1245P] where P = (F_o² + 2F_c²)/3
wR(F²) = 0.059	(Δ/σ)_max < 0.001
S = 1.10	Δρ_max = 0.24 e Å⁻³
1833 reflections	Δρ_min = −0.20 e Å⁻³
120 parameters	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
1 restraint	Extinction coefficient: 0.0115 (14)
Primary atom site location: structure-invariant direct methods	Absolute structure: Flack (1983), 712 Friedel pairs
Secondary atom site location: difference Fourier map	Absolute structure parameter: 0.02 (3)

Crystal data top

K⁺·C₇H₇BF₃O⁻	V = 903.66 (6) Å³
M_r = 214.04	Z = 4
Orthorhombic, Pca2₁	Mo Kα radiation
a = 7.1347 (2) Å	µ = 0.59 mm⁻¹
b = 17.2819 (7) Å	T = 120 K
c = 7.3289 (3) Å	0.52 × 0.15 × 0.15 mm

Data collection top

Rigaku CCD diffractometer	1833 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2012)	1822 reflections with I > 2σ(I)
T_min = 0.750, T_max = 0.917	R_int = 0.026
5789 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.021	H-atom parameters constrained
wR(F²) = 0.059	Δρ_max = 0.24 e Å⁻³
S = 1.10	Δρ_min = −0.20 e Å⁻³
1833 reflections	Absolute structure: Flack (1983), 712 Friedel pairs
120 parameters	Absolute structure parameter: 0.02 (3)
1 restraint

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
K1	0.93636 (3)	0.577078 (16)	0.49116 (4)	0.01659 (9)
C1	0.48663 (17)	0.69908 (7)	0.3989 (2)	0.0159 (3)
C2	0.36313 (18)	0.72309 (8)	0.2628 (2)	0.0195 (3)
H2	0.2718	0.6875	0.2199	0.023*
C3	0.36757 (18)	0.79722 (8)	0.1867 (2)	0.0223 (3)
H3	0.2813	0.8114	0.0938	0.027*
C4	0.5004 (2)	0.84983 (8)	0.2493 (2)	0.0208 (3)
C5	0.62439 (19)	0.82828 (8)	0.3880 (2)	0.0233 (3)
H5	0.7139	0.8643	0.4324	0.028*
C6	0.61673 (19)	0.75407 (8)	0.4608 (2)	0.0206 (3)
H6	0.7018	0.7402	0.5549	0.025*
C7	0.3970 (3)	0.94712 (11)	0.0422 (3)	0.0393 (5)
H7A	0.4278	1.0000	0.0044	0.059*
H7B	0.2674	0.9454	0.0865	0.059*
H7C	0.4105	0.9121	−0.0622	0.059*
B1	0.48502 (18)	0.61227 (8)	0.4743 (2)	0.0153 (3)
F1	0.57562 (10)	0.55930 (5)	0.35081 (13)	0.01754 (18)
F2	0.30347 (10)	0.58074 (4)	0.50165 (17)	0.02096 (19)
F3	0.58402 (11)	0.60460 (5)	0.64078 (13)	0.02023 (19)
O1	0.52053 (18)	0.92364 (6)	0.1842 (2)	0.0297 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
K1	0.01225 (13)	0.02391 (15)	0.01361 (16)	0.00081 (8)	0.00031 (12)	0.00042 (12)
C1	0.0132 (5)	0.0193 (6)	0.0152 (6)	0.0009 (5)	0.0007 (5)	−0.0009 (5)
C2	0.0199 (6)	0.0204 (6)	0.0183 (7)	−0.0015 (5)	−0.0044 (5)	−0.0014 (6)
C3	0.0233 (6)	0.0229 (6)	0.0206 (7)	0.0011 (5)	−0.0043 (5)	0.0017 (6)
C4	0.0234 (6)	0.0167 (6)	0.0222 (7)	0.0007 (5)	0.0007 (6)	0.0011 (6)
C5	0.0223 (6)	0.0200 (6)	0.0277 (8)	−0.0036 (5)	−0.0054 (5)	−0.0028 (6)
C6	0.0181 (5)	0.0211 (6)	0.0226 (8)	0.0002 (5)	−0.0046 (5)	−0.0010 (6)
C7	0.0421 (9)	0.0273 (7)	0.0484 (13)	0.0011 (7)	−0.0085 (8)	0.0167 (9)
B1	0.0121 (5)	0.0185 (6)	0.0153 (7)	0.0000 (4)	0.0002 (6)	0.0008 (6)
F1	0.0182 (4)	0.0196 (4)	0.0148 (5)	0.0031 (3)	0.0025 (3)	−0.0007 (4)
F2	0.0129 (3)	0.0209 (3)	0.0291 (5)	−0.0015 (2)	0.0028 (4)	−0.0004 (3)
F3	0.0204 (3)	0.0271 (4)	0.0132 (5)	−0.0004 (3)	−0.0022 (3)	0.0025 (4)
O1	0.0352 (5)	0.0176 (5)	0.0362 (8)	−0.0009 (4)	−0.0037 (6)	0.0052 (5)

Geometric parameters (Å, º) top

K1—F3ⁱ	2.6156 (10)	C4—C5	1.398 (2)
K1—F2ⁱⁱ	2.6211 (7)	C5—C6	1.390 (2)
K1—F1ⁱⁱⁱ	2.6550 (10)	C5—H5	0.9500
K1—F1^iv	2.7568 (10)	C6—H6	0.9500
K1—F3	2.7836 (8)	C7—O1	1.423 (2)
K1—F1	2.7887 (8)	C7—H7A	0.9800
K1—F2^iv	2.8885 (8)	C7—H7B	0.9800
K1—F3^iv	3.4886 (9)	C7—H7C	0.9800
C1—C2	1.3940 (19)	B1—F3	1.4162 (19)
C1—C6	1.4036 (18)	B1—F2	1.4196 (14)
C1—B1	1.5987 (18)	B1—F1	1.4403 (17)
C2—C3	1.398 (2)	B1—K1^v	3.2930 (14)
C2—K1ⁱ	3.5183 (15)	F1—K1ⁱ	2.6550 (10)
C2—H2	0.9500	F1—K1^v	2.7568 (10)
C3—C4	1.3910 (19)	F2—K1^vi	2.6211 (7)
C3—H3	0.9500	F2—K1^v	2.8885 (8)
C4—O1	1.3696 (17)	F3—K1ⁱⁱⁱ	2.6157 (10)

F3ⁱ—K1—F2ⁱⁱ	94.59 (3)	O1—C4—C5	115.78 (13)
F3ⁱ—K1—F1ⁱⁱⁱ	173.67 (3)	C3—C4—C5	119.79 (13)
F2ⁱⁱ—K1—F1ⁱⁱⁱ	90.34 (3)	C6—C5—C4	119.99 (13)
F3ⁱ—K1—F1^iv	79.00 (3)	C6—C5—H5	120.0
F2ⁱⁱ—K1—F1^iv	70.82 (2)	C4—C5—H5	120.0
F1ⁱⁱⁱ—K1—F1^iv	106.45 (2)	C5—C6—C1	121.78 (14)
F3ⁱ—K1—F3	107.78 (2)	C5—C6—H6	119.1
F2ⁱⁱ—K1—F3	152.47 (3)	C1—C6—H6	119.1
F1ⁱⁱⁱ—K1—F3	66.40 (3)	O1—C7—H7A	109.5
F1^iv—K1—F3	128.21 (2)	O1—C7—H7B	109.5
F3ⁱ—K1—F1	66.83 (3)	H7A—C7—H7B	109.5
F2ⁱⁱ—K1—F1	159.35 (3)	O1—C7—H7C	109.5
F1ⁱⁱⁱ—K1—F1	108.89 (2)	H7A—C7—H7C	109.5
F1^iv—K1—F1	95.79 (2)	H7B—C7—H7C	109.5
F3—K1—F1	47.98 (3)	F3—B1—F2	107.30 (13)
F3ⁱ—K1—F2^iv	100.35 (3)	F3—B1—F1	104.95 (10)
F2ⁱⁱ—K1—F2^iv	110.489 (19)	F2—B1—F1	104.73 (10)
F1ⁱⁱⁱ—K1—F2^iv	81.59 (3)	F3—B1—C1	112.45 (11)
F1^iv—K1—F2^iv	47.24 (3)	F2—B1—C1	114.56 (11)
F3—K1—F2^iv	81.63 (2)	F1—B1—C1	112.10 (12)
F1—K1—F2^iv	66.60 (3)	B1—F1—K1ⁱ	122.39 (8)
C2—C1—C6	116.59 (12)	B1—F1—K1^v	98.47 (7)
C2—C1—B1	121.46 (12)	K1ⁱ—F1—K1^v	117.24 (3)
C6—C1—B1	121.90 (12)	B1—F1—K1	96.46 (7)
C1—C2—C3	122.95 (12)	K1ⁱ—F1—K1	112.53 (3)
C1—C2—K1ⁱ	86.24 (8)	K1^v—F1—K1	106.81 (3)
C3—C2—K1ⁱ	114.99 (10)	B1—F2—K1^vi	156.48 (8)
C1—C2—H2	118.5	B1—F2—K1^v	93.39 (6)
C3—C2—H2	118.5	K1^vi—F2—K1^v	107.73 (2)
K1ⁱ—C2—H2	68.1	B1—F3—K1ⁱⁱⁱ	146.64 (8)
C4—C3—C2	118.88 (13)	B1—F3—K1	97.29 (7)
C4—C3—H3	120.6	K1ⁱⁱⁱ—F3—K1	113.95 (3)
C2—C3—H3	120.6	C4—O1—C7	117.09 (13)
O1—C4—C3	124.43 (14)

C6—C1—C2—C3	1.2 (2)	C2—C1—C6—C5	−1.1 (2)
B1—C1—C2—C3	−176.35 (14)	B1—C1—C6—C5	176.46 (14)
C6—C1—C2—K1ⁱ	118.72 (12)	C2—C1—B1—F3	−164.66 (12)
B1—C1—C2—K1ⁱ	−58.84 (12)	C6—C1—B1—F3	17.90 (18)
C1—C2—C3—C4	−0.2 (2)	C2—C1—B1—F2	−41.81 (19)
K1ⁱ—C2—C3—C4	−102.69 (14)	C6—C1—B1—F2	140.76 (15)
C2—C3—C4—O1	179.10 (14)	C2—C1—B1—F1	77.36 (16)
C2—C3—C4—C5	−0.9 (2)	C6—C1—B1—F1	−100.07 (15)
O1—C4—C5—C6	−178.99 (14)	C3—C4—O1—C7	−0.4 (2)
C3—C4—C5—C6	1.0 (2)	C5—C4—O1—C7	179.62 (15)
C4—C5—C6—C1	0.0 (2)

Symmetry codes: (i) −x+3/2, y, z−1/2; (ii) x+1, y, z; (iii) −x+3/2, y, z+1/2; (iv) x+1/2, −y+1, z; (v) x−1/2, −y+1, z; (vi) x−1, y, z.

Hydrogen-bond geometry (Å, º) top

Cg1 is the centroid of the C1–C6 benzene ring.

D—H···A	D—H	H···A	D···A	D—H···A
C2—H2···F2^vii	0.95	2.50	3.3359 (17)	147
C7—H7a···O1^viii	0.98	2.72	3.496 (1)	137
C3—H3···Cg1^vii	0.95	2.85	3.7171 (15)	152

Symmetry codes: (vii) −x+1/2, y, z−1/2; (viii) −x+1, −y+2, z−1/2.

(II) Potassium trifluorido(4-fluorophenyl)borate top

Crystal data top

K⁺·C₆H₄BF₄⁻	F(000) = 800
M_r = 202.00	D_x = 1.751 Mg m⁻³
Orthorhombic, Pbca	Mo Kα radiation, λ = 0.71075 Å
Hall symbol: -P 2ac 2ab	Cell parameters from 8210 reflections
a = 7.1317 (5) Å	θ = 3.2–27.5°
b = 7.3757 (5) Å	µ = 0.70 mm⁻¹
c = 29.129 (2) Å	T = 100 K
V = 1532.22 (18) Å³	Block, colourless
Z = 8	0.07 × 0.05 × 0.01 mm

Data collection top

Rigaku CCD diffractometer	1726 independent reflections
Radiation source: fine-focus sealed tube	1435 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.037
ω scans	θ_max = 27.5°, θ_min = 3.2°
Absorption correction: multi-scan (SADABS; Bruker, 2012)	h = −9→8
T_min = 0.953, T_max = 0.993	k = −9→7
9537 measured reflections	l = −32→37

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.027	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.065	H-atom parameters constrained
S = 1.06	w = 1/[σ²(F_o²) + (0.0274P)² + 0.6658P] where P = (F_o² + 2F_c²)/3
1726 reflections	(Δ/σ)_max = 0.001
109 parameters	Δρ_max = 0.27 e Å⁻³
0 restraints	Δρ_min = −0.23 e Å⁻³

Crystal data top

K⁺·C₆H₄BF₄⁻	V = 1532.22 (18) Å³
M_r = 202.00	Z = 8
Orthorhombic, Pbca	Mo Kα radiation
a = 7.1317 (5) Å	µ = 0.70 mm⁻¹
b = 7.3757 (5) Å	T = 100 K
c = 29.129 (2) Å	0.07 × 0.05 × 0.01 mm

Data collection top

Rigaku CCD diffractometer	1726 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2012)	1435 reflections with I > 2σ(I)
T_min = 0.953, T_max = 0.993	R_int = 0.037
9537 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.027	0 restraints
wR(F²) = 0.065	H-atom parameters constrained
S = 1.06	Δρ_max = 0.27 e Å⁻³
1726 reflections	Δρ_min = −0.23 e Å⁻³
109 parameters

Special details top

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
K1	0.06924 (4)	0.02356 (5)	0.205013 (12)	0.01668 (10)
C1	0.5118 (2)	0.1023 (2)	0.13156 (5)	0.0161 (3)
C2	0.3892 (2)	0.0245 (2)	0.09978 (6)	0.0213 (3)
H2	0.3130	−0.0745	0.1091	0.026*
C3	0.3750 (2)	0.0869 (2)	0.05506 (6)	0.0245 (4)
H3	0.2905	0.0324	0.0339	0.029*
C4	0.4867 (2)	0.2301 (2)	0.04213 (5)	0.0236 (4)
C5	0.6112 (2)	0.3121 (2)	0.07145 (6)	0.0250 (4)
H5	0.6871	0.4105	0.0616	0.030*
C6	0.6226 (2)	0.2463 (2)	0.11604 (6)	0.0207 (3)
H6	0.7085	0.3011	0.1367	0.025*
B1	0.5200 (2)	0.0373 (2)	0.18355 (6)	0.0147 (3)
F1	0.43225 (11)	0.16564 (12)	0.21396 (3)	0.0178 (2)
F2	0.70288 (11)	0.01321 (13)	0.20154 (3)	0.0210 (2)
F3	0.42107 (11)	−0.12680 (12)	0.19106 (3)	0.0193 (2)
F4	0.47218 (15)	0.29343 (14)	−0.00157 (3)	0.0327 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
K1	0.01228 (15)	0.01386 (17)	0.02390 (18)	0.00022 (12)	0.00079 (12)	0.00020 (13)
C1	0.0143 (6)	0.0139 (7)	0.0200 (8)	0.0019 (6)	0.0007 (6)	−0.0006 (6)
C2	0.0214 (7)	0.0201 (8)	0.0225 (8)	−0.0029 (7)	−0.0016 (6)	0.0002 (7)
C3	0.0268 (8)	0.0256 (9)	0.0211 (9)	−0.0019 (7)	−0.0056 (7)	−0.0016 (7)
C4	0.0306 (9)	0.0243 (9)	0.0160 (8)	0.0046 (7)	0.0013 (6)	0.0020 (7)
C5	0.0296 (9)	0.0221 (9)	0.0234 (9)	−0.0056 (7)	0.0052 (6)	0.0014 (7)
C6	0.0222 (7)	0.0189 (8)	0.0211 (8)	−0.0050 (7)	0.0007 (6)	−0.0014 (7)
B1	0.0116 (7)	0.0130 (8)	0.0194 (8)	0.0014 (6)	0.0006 (6)	−0.0008 (6)
F1	0.0184 (4)	0.0152 (5)	0.0198 (5)	0.0027 (4)	0.0027 (3)	−0.0012 (4)
F2	0.0125 (4)	0.0295 (5)	0.0209 (5)	0.0032 (4)	−0.0024 (3)	−0.0012 (4)
F3	0.0205 (4)	0.0125 (5)	0.0247 (5)	−0.0017 (4)	0.0003 (4)	0.0026 (4)
F4	0.0474 (6)	0.0332 (6)	0.0174 (5)	−0.0013 (5)	−0.0007 (5)	0.0061 (4)

Geometric parameters (Å, º) top

K1—F3ⁱ	2.6116 (10)	C4—F4	1.3597 (18)
K1—F2ⁱⁱ	2.6159 (9)	C4—C5	1.373 (2)
K1—F1ⁱⁱⁱ	2.6527 (9)	C5—C6	1.389 (2)
K1—F1^iv	2.7612 (10)	C5—H5	0.9500
K1—F3	2.7732 (9)	C6—H6	0.9500
K1—F1	2.8050 (9)	B1—F2	1.4166 (17)
K1—F2^iv	2.8853 (10)	B1—F3	1.4182 (19)
K1—F3^iv	3.3927 (10)	B1—F1	1.4393 (18)
C1—C2	1.397 (2)	B1—K1^v	3.2665 (18)
C1—C6	1.399 (2)	F1—K1ⁱ	2.6527 (9)
C1—B1	1.590 (2)	F1—K1^v	2.7612 (9)
C2—C3	1.385 (2)	F2—K1^vi	2.6159 (9)
C2—H2	0.9500	F2—K1^v	2.8852 (10)
C3—C4	1.375 (2)	F3—K1ⁱⁱⁱ	2.6116 (10)
C3—H3	0.9500	F3—K1^v	3.3928 (10)

F3ⁱ—K1—F2ⁱⁱ	92.82 (3)	F4—C4—C3	118.44 (15)
F3ⁱ—K1—F1ⁱⁱⁱ	176.44 (3)	C5—C4—C3	122.87 (16)
F2ⁱⁱ—K1—F1ⁱⁱⁱ	88.32 (3)	C4—C5—C6	117.74 (16)
F3ⁱ—K1—F1^iv	76.56 (3)	C4—C5—H5	121.1
F2ⁱⁱ—K1—F1^iv	71.99 (3)	C6—C5—H5	121.1
F1ⁱⁱⁱ—K1—F1^iv	107.00 (2)	C5—C6—C1	122.34 (15)
F3ⁱ—K1—F3	110.37 (2)	C5—C6—H6	118.8
F2ⁱⁱ—K1—F3	152.42 (3)	C1—C6—H6	118.8
F1ⁱⁱⁱ—K1—F3	67.67 (3)	F2—B1—F3	107.08 (12)
F1^iv—K1—F3	126.67 (3)	F2—B1—F1	104.80 (12)
F3ⁱ—K1—F1	67.74 (3)	F3—B1—F1	104.48 (11)
F2ⁱⁱ—K1—F1	159.45 (3)	F2—B1—C1	115.08 (12)
F1ⁱⁱⁱ—K1—F1	111.49 (2)	F3—B1—C1	112.70 (13)
F1^iv—K1—F1	96.05 (2)	F1—B1—C1	111.86 (12)
F3—K1—F1	47.78 (3)	F2—B1—K1^v	61.95 (7)
F3ⁱ—K1—F2^iv	99.45 (3)	F3—B1—K1^v	82.74 (8)
F2ⁱⁱ—K1—F2^iv	111.45 (2)	F1—B1—K1^v	57.03 (7)
F1ⁱⁱⁱ—K1—F2^iv	83.24 (3)	C1—B1—K1^v	163.77 (11)
F1^iv—K1—F2^iv	47.18 (2)	F2—B1—K1	145.97 (10)
F3—K1—F2^iv	80.14 (3)	F3—B1—K1	57.04 (6)
F1—K1—F2^iv	67.51 (3)	F1—B1—K1	58.42 (6)
F3ⁱ—K1—F3^iv	118.03 (3)	C1—B1—K1	98.93 (9)
F2ⁱⁱ—K1—F3^iv	73.38 (3)	K1^v—B1—K1	85.12 (4)
F1ⁱⁱⁱ—K1—F3^iv	65.53 (2)	B1—F1—K1ⁱ	126.56 (8)
F1^iv—K1—F3^iv	41.51 (2)	B1—F1—K1^v	97.04 (8)
F3—K1—F3^iv	106.37 (3)	K1ⁱ—F1—K1^v	117.58 (3)
F1—K1—F3^iv	109.07 (3)	B1—F1—K1	95.66 (8)
F2^iv—K1—F3^iv	41.62 (2)	K1ⁱ—F1—K1	111.04 (3)
C2—C1—C6	116.82 (15)	K1^v—F1—K1	105.32 (3)
C2—C1—B1	122.05 (14)	B1—F2—K1^vi	158.46 (9)
C6—C1—B1	121.08 (14)	B1—F2—K1^v	92.38 (8)
C3—C2—C1	122.18 (15)	K1^vi—F2—K1^v	107.01 (3)
C3—C2—H2	118.9	B1—F3—K1ⁱⁱⁱ	148.62 (8)
C1—C2—H2	118.9	B1—F3—K1	97.55 (8)
C4—C3—C2	118.06 (15)	K1ⁱⁱⁱ—F3—K1	113.33 (3)
C4—C3—H3	121.0	B1—F3—K1^v	72.76 (8)
C2—C3—H3	121.0	K1ⁱⁱⁱ—F3—K1^v	100.12 (3)
F4—C4—C5	118.69 (15)	K1—F3—K1^v	91.16 (3)

C6—C1—C2—C3	−0.7 (2)	C2—C1—C6—C5	0.8 (2)
B1—C1—C2—C3	176.65 (15)	B1—C1—C6—C5	−176.56 (15)
C1—C2—C3—C4	0.1 (3)	C2—C1—B1—F2	135.24 (15)
C2—C3—C4—F4	−179.32 (15)	C6—C1—B1—F2	−47.6 (2)
C2—C3—C4—C5	0.4 (3)	C2—C1—B1—F3	12.0 (2)
F4—C4—C5—C6	179.43 (15)	C6—C1—B1—F3	−170.75 (13)
C3—C4—C5—C6	−0.3 (3)	C2—C1—B1—F1	−105.32 (17)
C4—C5—C6—C1	−0.3 (3)	C6—C1—B1—F1	71.88 (18)

Symmetry codes: (i) −x+1/2, y+1/2, z; (ii) x−1, y, z; (iii) −x+1/2, y−1/2, z; (iv) x−1/2, y, −z+1/2; (v) x+1/2, y, −z+1/2; (vi) x+1, y, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C6—H6···F2^vii	0.95	2.53	3.4099 (19)	154

Symmetry code: (vii) −x+3/2, y+1/2, z.

Experimental details

	(I)	(II)
Crystal data
Chemical formula	K⁺·C₇H₇BF₃O⁻	K⁺·C₆H₄BF₄⁻
M_r	214.04	202.00
Crystal system, space group	Orthorhombic, Pca2₁	Orthorhombic, Pbca
Temperature (K)	120	100
a, b, c (Å)	7.1347 (2), 17.2819 (7), 7.3289 (3)	7.1317 (5), 7.3757 (5), 29.129 (2)
V (Å³)	903.66 (6)	1532.22 (18)
Z	4	8
Radiation type	Mo Kα	Mo Kα
µ (mm⁻¹)	0.59	0.70
Crystal size (mm)	0.52 × 0.15 × 0.15	0.07 × 0.05 × 0.01

Data collection
Diffractometer	Rigaku CCD diffractometer	Rigaku CCD diffractometer
Absorption correction	Multi-scan (SADABS; Bruker, 2012)	Multi-scan (SADABS; Bruker, 2012)
T_min, T_max	0.750, 0.917	0.953, 0.993
No. of measured, independent and observed [I > 2σ(I)] reflections	5789, 1833, 1822	9537, 1726, 1435
R_int	0.026	0.037
(sin θ/λ)_max (Å⁻¹)	0.649	0.649

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.021, 0.059, 1.10	0.027, 0.065, 1.06
No. of reflections	1833	1726
No. of parameters	120	109
No. of restraints	1	0
H-atom treatment	H-atom parameters constrained	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.24, −0.20	0.27, −0.23
Absolute structure	Flack (1983), 712 Friedel pairs	?
Absolute structure parameter	0.02 (3)	?

Computer programs: CrystalClear (Rigaku, 2010), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 2012), publCIF (Westrip, 2010).

Selected bond lengths (Å) for (I) top

K1—F3ⁱ	2.6156 (10)	K1—F2^iv	2.8885 (8)
K1—F2ⁱⁱ	2.6211 (7)	K1—F3^iv	3.4886 (9)
K1—F1ⁱⁱⁱ	2.6550 (10)	B1—F3	1.4162 (19)
K1—F1^iv	2.7568 (10)	B1—F2	1.4196 (14)
K1—F3	2.7836 (8)	B1—F1	1.4403 (17)
K1—F1	2.7887 (8)

Symmetry codes: (i) −x+3/2, y, z−1/2; (ii) x+1, y, z; (iii) −x+3/2, y, z+1/2; (iv) x+1/2, −y+1, z.

Selected bond lengths (Å) for (II) top

K1—F3ⁱ	2.6116 (10)	K1—F2^iv	2.8853 (10)
K1—F2ⁱⁱ	2.6159 (9)	K1—F3^iv	3.3927 (10)
K1—F1ⁱⁱⁱ	2.6527 (9)	B1—F2	1.4166 (17)
K1—F1^iv	2.7612 (10)	B1—F3	1.4182 (19)
K1—F3	2.7732 (9)	B1—F1	1.4393 (18)
K1—F1	2.8050 (9)

Symmetry codes: (i) −x+1/2, y+1/2, z; (ii) x−1, y, z; (iii) −x+1/2, y−1/2, z; (iv) x−1/2, y, −z+1/2.

Hydrogen-bond geometry (Å, º) for (I) top

Cg1 is the centroid of the C1–C6 benzene ring.

D—H···A	D—H	H···A	D···A	D—H···A
C2—H2···F2^v	0.95	2.50	3.3359 (17)	147
C7—H7a···O1^vi	0.98	2.72	3.496 (1)	137
C3—H3···Cg1^v	0.95	2.85	3.7171 (15)	152

Symmetry codes: (v) −x+1/2, y, z−1/2; (vi) −x+1, −y+2, z−1/2.

Hydrogen-bond geometry (Å, º) for (II) top

D—H···A	D—H	H···A	D···A	D—H···A
C6—H6···F2^v	0.95	2.53	3.4099 (19)	154

Symmetry code: (v) −x+3/2, y+1/2, z.

Acknowledgements

We thank the National Crystallography Service (University of Southampton) for the data collections.

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Volume 70| Part 8| August 2014| Pages 68-71

doi:10.1107/S1600536814009684

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Crystal structures of potassium tri­fluorido­(4-meth­­oxy­phen­yl)borate and potassium tri­fluorido(4-fluoro­phen­yl)borate

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Database survey

5. Synthesis and crystallization

6. Refinement

Supporting information

Acknowledgements

References

research communications

Crystal structures of potassium trifluorido(4-methoxyphenyl)borate and potassium trifluorido(4-fluorophenyl)borate

3. Supramolecular features