4-Cyano-1-methyl­pyridinium perchlor­ate

The title salt, C₇H₇N₂⁺·ClO₄⁻, crystallizes with alternating cations and anions in wavy sheets, which are formed by a number of C—H...O and C—H...N hydrogen bonds, lying approximately parallel to (001).

Key indicators

• Single-crystal X-ray study
• T = 100 K
• Mean [sigma](C-C) = 0.002 Å
• R factor = 0.034
• wR factor = 0.097
• Data-to-parameter ratio = 19.2

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT480_ALERT_4_C Long H...A H-Bond Reported H1C    ..  O2      ..       2.61 Ang.
PLAT480_ALERT_4_C Long H...A H-Bond Reported H2     ..  O2      ..       2.63 Ang.
PLAT480_ALERT_4_C Long H...A H-Bond Reported H3     ..  N2      ..       2.67 Ang.

Alert level G
PLAT005_ALERT_5_G No _iucr_refine_instructions_details  in the CIF     Please Do !
PLAT912_ALERT_4_G Missing # of FCF Reflections Above STh/L=  0.600         34 Note

   0 ALERT level A = Most likely a serious problem - resolve or explain
   0 ALERT level B = A potentially serious problem, consider carefully
   3 ALERT level C = Check. Ensure it is not caused by an omission or oversight
   2 ALERT level G = General information/check it is not something unexpected

   0 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   0 ALERT type 2 Indicator that the structure model may be wrong or deficient
   0 ALERT type 3 Indicator that the structure quality may be low
   4 ALERT type 4 Improvement, methodology, query or suggestion
   1 ALERT type 5 Informative message, check

---

S1. Comment

The title compound, Fig. 1, crystallizes with alternating cations and anions in wavy sheets, which are formed by a number of C—H···O and C—H···N hydrogen bonds, which are approximately parallel to (001) [see Table 1 and Fig. 2].

As with 3-cyano-1-methylpyridinium perchlorate (McCormick et al., 2014), the perchlorate ions are located near the pyridinium nitrogen atoms as the result of electrostatic attraction but the remainder of the two structures differ considerably due to the different position of the cyano group and the effect this has on the weak interionic interactions.

Related literature

For the crystal structures of other 4-cyano-1-methylpyridinium salts, see: McCormick et al. (2013); Kammer et al. (2012a,b); Hardacre et al. (2008, 2010); Glavcheva et al. (2004); Bockman & Kochi (1989, 1992). For the structure of 3-cyano-1-methylpyridinium perchlorate, see: McCormick et al. (2014) and for the structure of 4-cyanoanilinium perchlorate, see: Dai (2008). For [please specify subject], see: Frontera et al. (2011).

S2. Experimental

4-Cyanopyridine (10.55 g) was dissolved in benzene (40 ml). Iodomethane (9.5 ml) was added to this solution slowly with stirring and the solution was refluxed for 75 minutes. Yellow solid 4-cyano-1-methylpyridinium iodide (m.p. 189–193° C) was collected by vacuum filtration. This solid (0.98 g) was then dissolved in a solution of silver perchlorate previously prepared by reacting Ag₂O (0.47 g) with 0.5 M aqueous HClO₄(8.0 ml). After stirring, precipitated AgI was removed by vacuum filtration and the filtrate containing 4-cyano-1-methylpyridinium perchlorate (m.p.114–119° C) was slowly evaporated to dryness to form crystals of the title compound.

S3. Refinement

H-atoms were placed in calculated positions (C—H = 0.95 - 0.98 Å) and included as riding contributions with U_iso(H) = 1.5U_eq(C-methyl) and = 1.2U_eq(C) for other H atoms.

Computing details

Data collection: APEX2 (Bruker, 2010); cell refinement: SAINT (Bruker, 2010); data reduction: SAINT (Bruker, 2010); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL (Sheldrick, 2008)').

Figures

	Fig. 1. A view of the molecular structure of the title compound, with atom labelling. Displacement ellipsoids are drawn at the 50% probability level.
	Fig. 2. A view of the crystal packing along the b axis, with the C—H···O and C—H···N hydrogen bonds as red and blue dashed lines, respectively (see Table 1 for details).

4-Cyano-1-methylpyridinium perchlorate

Crystal data

C7H7N2^+·ClO4^−	F(000) = 896
Mr = 218.60	Dx = 1.557 Mg m^−3
Orthorhombic, Pbca	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ac 2ab	Cell parameters from 9543 reflections
a = 10.232 (2) Å	θ = 3.0–29.1°
b = 10.872 (3) Å	µ = 0.40 mm^−1
c = 16.769 (4) Å	T = 100 K
V = 1865.3 (7) Å^3	Block, colourless
Z = 8	0.23 × 0.16 × 0.12 mm

Data collection

Bruker SMART APEX CCD diffractometer	2475 independent reflections
Radiation source: fine-focus sealed tube	2235 reflections with I > 2σ(I)
Graphite monochromator	Rint = 0.054
φ and ω scans	θmax = 29.1°, θmin = 2.4°
Absorption correction: multi-scan (SADABS; Bruker, 2010)	h = −13→14
Tmin = 0.86, Tmax = 0.95	k = −14→14
30647 measured reflections	l = −22→22

Refinement

Refinement on F^2	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F^2 > 2σ(F^2)] = 0.034	H-atom parameters constrained
wR(F^2) = 0.097	w = 1/[σ^2(Fo^2) + (0.0474P)^2 + 1.204P] where P = (Fo^2 + 2Fc^2)/3
S = 1.07	(Δ/σ)max < 0.001
2475 reflections	Δρmax = 0.38 e Å^−3
129 parameters	Δρmin = −0.39 e Å^−3
0 restraints	Extinction correction: SHELXL97 (Sheldrick, 2008), Fc^*=kFc[1+0.001xFc^2λ^3/sin(2θ)]^-1/4
Primary atom site location: structure-invariant direct methods	Extinction coefficient: 0.0061 (7)

Special details

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. H-atoms were placed in calculated positions (C—H = 0.95 - 0.98 Å) and included as riding contributions with isotropic displacement parameters 1.2 - 1.5 times those of the attached carbon atoms.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Ų)

	x	y	z	Uiso*/Ueq
N1	0.07438 (11)	0.87020 (10)	0.65230 (6)	0.0173 (2)
N2	−0.23590 (12)	0.56153 (11)	0.49548 (7)	0.0259 (3)
C1	0.15878 (14)	0.95747 (13)	0.69622 (9)	0.0238 (3)
H1A	0.2307	0.9125	0.7215	0.036*
H1B	0.1071	0.9994	0.7372	0.036*
H1C	0.1944	1.0183	0.6590	0.036*
C2	−0.04511 (13)	0.90672 (12)	0.62884 (8)	0.0201 (3)
H2	−0.0730	0.9884	0.6394	0.024*
C3	−0.12714 (13)	0.82710 (12)	0.58970 (8)	0.0198 (3)
H3	−0.2115	0.8530	0.5731	0.024*
C4	−0.08458 (13)	0.70782 (12)	0.57475 (7)	0.0175 (3)
C5	0.03964 (13)	0.67124 (12)	0.59898 (8)	0.0204 (3)
H5	0.0700	0.5902	0.5887	0.024*
C6	0.11766 (14)	0.75535 (13)	0.63820 (8)	0.0200 (3)
H6	0.2026	0.7320	0.6554	0.024*
C7	−0.16859 (13)	0.62451 (12)	0.53131 (8)	0.0201 (3)
Cl1	0.01260 (3)	0.73669 (3)	0.35515 (2)	0.01939 (12)
O1	0.12396 (10)	0.79937 (10)	0.32127 (6)	0.0253 (2)
O2	−0.05193 (12)	0.81513 (10)	0.41181 (6)	0.0285 (3)
O3	0.05528 (12)	0.62622 (10)	0.39448 (9)	0.0386 (3)
O4	−0.07787 (11)	0.70787 (15)	0.29216 (7)	0.0432 (4)

Atomic displacement parameters (Ų)

	U^11	U^22	U^33	U^12	U^13	U^23
N1	0.0169 (5)	0.0170 (5)	0.0180 (5)	−0.0015 (4)	0.0016 (4)	0.0016 (4)
N2	0.0280 (6)	0.0231 (6)	0.0265 (6)	−0.0034 (5)	−0.0028 (5)	0.0021 (5)
C1	0.0233 (6)	0.0201 (6)	0.0278 (7)	−0.0042 (5)	−0.0028 (5)	−0.0017 (5)
C2	0.0206 (6)	0.0157 (6)	0.0241 (6)	0.0022 (5)	0.0010 (5)	0.0026 (5)
C3	0.0177 (6)	0.0184 (6)	0.0232 (6)	0.0023 (5)	−0.0001 (5)	0.0039 (5)
C4	0.0187 (6)	0.0182 (6)	0.0155 (5)	−0.0011 (5)	0.0017 (4)	0.0020 (4)
C5	0.0200 (6)	0.0183 (6)	0.0229 (6)	0.0040 (5)	0.0013 (5)	−0.0013 (5)
C6	0.0160 (6)	0.0210 (6)	0.0229 (6)	0.0030 (5)	0.0007 (5)	0.0007 (5)
C7	0.0208 (6)	0.0184 (6)	0.0211 (6)	0.0010 (5)	0.0005 (5)	0.0041 (5)
Cl1	0.01679 (17)	0.01989 (18)	0.02150 (19)	0.00045 (11)	0.00104 (11)	−0.00297 (11)
O1	0.0221 (5)	0.0261 (5)	0.0277 (5)	−0.0036 (4)	0.0033 (4)	0.0018 (4)
O2	0.0401 (6)	0.0236 (5)	0.0217 (5)	0.0050 (4)	0.0099 (4)	−0.0012 (4)
O3	0.0292 (6)	0.0213 (5)	0.0654 (9)	0.0055 (4)	0.0110 (6)	0.0133 (5)
O4	0.0193 (5)	0.0806 (10)	0.0297 (6)	−0.0081 (6)	−0.0003 (5)	−0.0213 (6)

Geometric parameters (Å, º)

N1—C2	1.3443 (18)	C3—H3	0.9500
N1—C6	1.3458 (17)	C4—C5	1.3924 (19)
N1—C1	1.4793 (17)	C4—C7	1.4456 (18)
N2—C7	1.1420 (18)	C5—C6	1.3806 (19)
C1—H1A	0.9800	C5—H5	0.9500
C1—H1B	0.9800	C6—H6	0.9500
C1—H1C	0.9800	Cl1—O2	1.4373 (10)
C2—C3	1.3728 (19)	Cl1—O3	1.4382 (12)
C2—H2	0.9500	Cl1—O4	1.4389 (12)
C3—C4	1.3907 (18)	Cl1—O1	1.4441 (10)
C2—N1—C6	121.46 (12)	C3—C4—C7	119.27 (12)
C2—N1—C1	119.16 (11)	C5—C4—C7	120.72 (12)
C6—N1—C1	119.36 (11)	C6—C5—C4	118.54 (12)
N1—C1—H1A	109.5	C6—C5—H5	120.7
N1—C1—H1B	109.5	C4—C5—H5	120.7
H1A—C1—H1B	109.5	N1—C6—C5	120.52 (12)
N1—C1—H1C	109.5	N1—C6—H6	119.7
H1A—C1—H1C	109.5	C5—C6—H6	119.7
H1B—C1—H1C	109.5	N2—C7—C4	177.94 (14)
N1—C2—C3	120.65 (12)	O2—Cl1—O3	109.38 (7)
N1—C2—H2	119.7	O2—Cl1—O4	108.60 (7)
C3—C2—H2	119.7	O3—Cl1—O4	110.50 (9)
C2—C3—C4	118.86 (12)	O2—Cl1—O1	110.03 (7)
C2—C3—H3	120.6	O3—Cl1—O1	109.56 (7)
C4—C3—H3	120.6	O4—Cl1—O1	108.76 (7)
C3—C4—C5	119.97 (12)
C6—N1—C2—C3	0.2 (2)	C3—C4—C5—C6	0.48 (19)
C1—N1—C2—C3	−178.38 (12)	C7—C4—C5—C6	178.09 (12)
N1—C2—C3—C4	0.0 (2)	C2—N1—C6—C5	−0.1 (2)
C2—C3—C4—C5	−0.4 (2)	C1—N1—C6—C5	178.49 (12)
C2—C3—C4—C7	−178.02 (12)	C4—C5—C6—N1	−0.3 (2)

Hydrogen-bond geometry (Å, º)

D—H···A	D—H	H···A	D···A	D—H···A
C1—H1A···O4^i	0.98	2.37	3.245 (2)	149
C1—H1C···O2^ii	0.98	2.61	3.2540 (19)	123
C2—H2···O1^ii	0.95	2.46	3.4001 (18)	173
C2—H2···O2^ii	0.95	2.63	3.2549 (18)	123
C3—H3···N2^iii	0.95	2.67	3.3098 (18)	125
C3—H3···O3^iv	0.95	2.46	3.300 (2)	148
C6—H6···O4^i	0.95	2.50	3.351 (2)	149

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