Potassium aqua­terbium(III) oxalate sulfate

Sun, Y.-G.; Guo, M.; Xiong, G.; Jiang, B.; Wang, L.

doi:10.1107/S1600536809019679

inorganic compounds

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 65| Part 7| July 2009| Page i48

doi:10.1107/S1600536809019679

Open

access

Potassium aquaterbium(III) oxalate sulfate

Ya-Guang Sun,^a ^* Mei-yan Guo,^a Gang Xiong,^a Bing Jiang ^a and Lei Wang ^a

^aLaboratory of Coordination Chemistry, Shenyang Institute of Chemical Technology, Shenyang 110142, People's Republic of China
^*Correspondence e-mail: yaguangsun@yahoo.com.cn

(Received 22 April 2009; accepted 24 May 2009; online 6 June 2009)

Single crystals of KTb(C₂O₄)(SO₄)(H₂O), potassium aquaterbium(III) oxalate sulfate, were obtained under hydrothermal conditions. In the crystal structure, the Tb(III) atom is coordinated by four O atoms from two oxalate anions, three O atoms from three sulfate anions and one O atom from a water molecule within a TbO₈ distorted square antiprismatic coordination. The potassium and terbium(III) atoms are bridged by the oxalate and sulfate groups, forming a three-dimensional structure. The coordination mode of the oxalate has not yet been reported. O—H⋯O hydrogen bonding between the water molecules and the oxygen atoms of oxalate and sulfate anions is also observed.

Related literature

For oxaltes and their coordination modes, see: Audebrand et al. (2003 ); Dean et al. (2004 ); Lu et al. (2004 ).

Experimental

Crystal data

KTb(C₂O₄)(SO₄)(H₂O)
M_r = 400.14
Monoclinic, P 2₁ /c
a = 6.5274 (13) Å
b = 8.5072 (17) Å
c = 14.591 (4) Å
β = 112.65 (3)°
V = 747.7 (3) Å³
Z = 4
Mo Kα radiation
μ = 10.32 mm⁻¹
T = 113 K
0.06 × 0.04 × 0.02 mm

Data collection

Bruker SMART 1000 CCD diffractometer
Absorption correction: multi-scan (SADABS; Sheldrick, 2003 ) T_min = 0.576, T_max = 0.820
4812 measured reflections
1317 independent reflections
1079 reflections with I > 2σ(I)
R_int = 0.057

Refinement

R[F² > 2σ(F²)] = 0.023
wR(F²) = 0.051
S = 1.05
1317 reflections
127 parameters
24 restraints
H-atom parameters constrained
Δρ_max = 0.92 e Å⁻³
Δρ_min = −0.78 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O9—H9A⋯O2ⁱ	0.96 (6)	1.88 (4)	2.731 (4)	145 (5)
O9—H9B⋯O3ⁱⁱ	0.96 (6)	1.86 (3)	2.787 (5)	160 (9)
O9—H9B⋯O7ⁱ	0.97 (6)	2.83 (9)	3.149 (5)	100 (6)
Symmetry codes: (i) -x+1, -y+1, -z; (ii) -x, -y+1, -z.

Data collection: SMART (Bruker, 2001 ); cell refinement: SAINT (Bruker, 2001); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1998 ); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536809019679/br2105sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536809019679/br2105Isup2.hkl

checkCIF report

Comment top

Recently, rationally design of novel inorganic componds based on alkali metal ions and rare earth ions are currently of great interest because of their potential applications in photoluminescent fields. For purpose of enriching the chemistry field of this compound family, we have successfully synthesized the title compound.

In the title compound, the coordination environments of the rare earth Tb^III cations consist of eight O atoms which are associated with one water molecule, two sulfate groups and two oxalates. Tb^III cations are at the shared apex of two dicapped rectangular pyramids (Fig.1). The K⁺ cations are surrounded by nine O atoms, including one water O atom, six O atoms from oxalates and two O atoms from sulfate groups.

Oxalates are of considerable interest because many of them are natural minerals and in addition, the oxalate anion can adopt different coordination modes to bind metals to form infinite chains, sheets and networks, leading to the rich structural chemistry (Lu et al., 2004; Dean et al., 2004; Audebrand et al., 2003). In the title compound, the oxalate ligand has an unique coordination mode (κ³-κ²-µ₄)-(κ³-κ²-µ₄)-µ₆-ox^2-. Fig.2 shows coordination mode of the oxalate and sulfate ligands in the title compuond.

Two adjacent Tb^III ions were connected through the oxalates to form one-dimensional chain structure (see Fig.3), and then were connected through the sulfate anions and water molecules to form the three-dimensional framework (see Fig.4).

Related literature top

For oxaltes and their coordination modes, see: Audebrand et al. (2003); Dean et al. (2004); Lu et al. (2004).

Experimental top

A mixture of FeSO₄.7H₂O (0.1 mmol),Tb(NO₃)₃.5H₂O (0.1 mmol) and oxalic acid (0.2 mmol) in H₂O (10 mL) was adjust to pH=6.8 with KOH aqueous solution, sealed in a 25 mL Teflon-lined bomb at 430 K for 4 days and then slowly cooled to room temperature at a rate of 5° K per hour. Colorless block crystals were obtained by filtration.The structure was determined by single-crystal diffraction.

Computing details top

Data collection: SMART (Bruker, 2001); cell refinement: SMART (Bruker, 2001); data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1998); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. A view of the environment of (a) the Tb atom, The symmetry codes are in Table 1.Displacement ellipsoids are drawn at the 50% probability level.
	Fig. 2. A view of coordination modes of (a)the Oxalate and (b) the sulfate anion.
	Fig. 3. The one-dimensional chain structure of the KTb(SO₄)(C₂O₄)(H₂O) along c axis(hydrogen atoms omitted).
	Fig. 4. The structural arrangement of KTb(SO₄)(C₂O₄)(H₂O) along b axis(hydrogen and potassium atoms omitted).The green polyhedras are TbO_8.

Potassium aquaterbium(III) oxalate sulfate top

Crystal data top

KTb(C₂O₄)(SO₄)(H₂O)	F(000) = 744
M_r = 400.14	D_x = 3.554 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 1317 reflections
a = 6.5274 (13) Å	θ = 2.8–27.2°
b = 8.5072 (17) Å	µ = 10.32 mm⁻¹
c = 14.591 (4) Å	T = 113 K
β = 112.65 (3)°	Block, colorless
V = 747.7 (3) Å³	0.06 × 0.04 × 0.02 mm
Z = 4

Data collection top

Bruker SMART 1000 CCD diffractometer	1317 independent reflections
Radiation source: rotating anode	1079 reflections with I > 2σ(I)
Confocal monochromator	R_int = 0.057
ω scans	θ_max = 25.0°, θ_min = 2.8°
Absorption correction: multi-scan (SADABS; Sheldrick, 2003)	h = −7→7
T_min = 0.576, T_max = 0.820	k = −9→10
4812 measured reflections	l = −17→17

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)] = 0.023	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.051	H-atom parameters constrained
S = 1.05	w = 1/[σ²(F_o²) + (0.0171P)²] where P = (F_o² + 2F_c²)/3
1317 reflections	(Δ/σ)_max = 0.001
127 parameters	Δρ_max = 0.92 e Å⁻³
24 restraints	Δρ_min = −0.78 e Å⁻³

Crystal data top

KTb(C₂O₄)(SO₄)(H₂O)	V = 747.7 (3) Å³
M_r = 400.14	Z = 4
Monoclinic, P2₁/c	Mo Kα radiation
a = 6.5274 (13) Å	µ = 10.32 mm⁻¹
b = 8.5072 (17) Å	T = 113 K
c = 14.591 (4) Å	0.06 × 0.04 × 0.02 mm
β = 112.65 (3)°

Data collection top

Bruker SMART 1000 CCD diffractometer	1317 independent reflections
Absorption correction: multi-scan (SADABS; Sheldrick, 2003)	1079 reflections with I > 2σ(I)
T_min = 0.576, T_max = 0.820	R_int = 0.057
4812 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.023	24 restraints
wR(F²) = 0.051	H-atom parameters constrained
S = 1.05	Δρ_max = 0.92 e Å⁻³
1317 reflections	Δρ_min = −0.78 e Å⁻³
127 parameters

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
Tb1	0.33208 (4)	0.24112 (3)	0.086605 (17)	0.00425 (11)
K1	0.9670 (2)	−0.15405 (14)	0.19899 (9)	0.0144 (3)
S1	0.7406 (2)	0.16467 (15)	−0.02448 (9)	0.0057 (3)
O1	0.2682 (6)	0.1255 (4)	0.2251 (3)	0.0079 (8)
O2	0.6044 (6)	0.4446 (4)	0.1557 (2)	0.0074 (8)
O3	0.2189 (6)	0.4466 (4)	0.1717 (2)	0.0079 (8)
O4	0.6523 (6)	0.1083 (4)	0.1984 (3)	0.0065 (8)
O5	0.5568 (7)	0.2364 (4)	−0.0040 (3)	0.0077 (8)
O6	0.7540 (6)	−0.0053 (4)	−0.0015 (3)	0.0080 (8)
O7	0.9493 (7)	0.2388 (4)	0.0409 (3)	0.0096 (9)
O8	0.7035 (7)	0.1876 (5)	−0.1285 (3)	0.0119 (9)
O9	0.1774 (6)	0.4070 (4)	−0.0544 (3)	0.0072 (8)
H9A	0.285 (8)	0.475 (6)	−0.063 (5)	0.04 (2)*
H9B	0.047 (6)	0.448 (9)	−0.107 (5)	0.13 (4)*
C1	0.4137 (9)	0.0364 (6)	0.2801 (4)	0.0043 (11)
C2	0.3644 (9)	0.5312 (6)	0.2329 (4)	0.0052 (11)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Tb1	0.00438 (17)	0.00457 (17)	0.00411 (16)	0.00031 (11)	0.00197 (12)	0.00024 (10)
K1	0.0141 (8)	0.0162 (7)	0.0164 (7)	−0.0038 (6)	0.0099 (6)	−0.0061 (5)
S1	0.0054 (8)	0.0063 (7)	0.0061 (7)	−0.0002 (6)	0.0029 (6)	−0.0010 (5)
O1	0.006 (2)	0.009 (2)	0.010 (2)	0.0033 (17)	0.0045 (18)	0.0001 (15)
O2	0.010 (2)	0.0070 (19)	0.008 (2)	−0.0028 (17)	0.0067 (18)	−0.0041 (16)
O3	0.008 (2)	0.009 (2)	0.006 (2)	−0.0019 (17)	0.0013 (18)	−0.0020 (15)
O4	0.0068 (12)	0.0062 (11)	0.0066 (11)	−0.0001 (9)	0.0028 (9)	−0.0002 (8)
O5	0.011 (2)	0.0047 (19)	0.013 (2)	0.0011 (16)	0.0096 (18)	−0.0002 (14)
O6	0.011 (2)	0.0035 (19)	0.010 (2)	−0.0010 (17)	0.0048 (17)	−0.0014 (14)
O7	0.008 (2)	0.009 (2)	0.012 (2)	0.0002 (17)	0.0041 (18)	0.0008 (16)
O8	0.016 (3)	0.014 (2)	0.008 (2)	−0.0015 (19)	0.0071 (19)	0.0010 (16)
O9	0.0063 (12)	0.0077 (12)	0.0083 (11)	−0.0003 (9)	0.0036 (9)	0.0017 (8)
C1	0.0048 (14)	0.0036 (14)	0.0043 (13)	0.0005 (9)	0.0015 (10)	−0.0011 (9)
C2	0.0052 (14)	0.0046 (14)	0.0057 (14)	0.0003 (9)	0.0019 (10)	0.0010 (9)

Geometric parameters (Å, º) top

Tb1—O6ⁱ	2.311 (4)	S1—O5	1.476 (3)
Tb1—O5	2.323 (3)	S1—O6	1.480 (4)
Tb1—O7ⁱⁱ	2.325 (4)	O1—C1	1.238 (6)
Tb1—O9	2.375 (4)	O1—K1^vii	2.900 (3)
Tb1—O4	2.382 (4)	O1—K1ⁱⁱ	3.016 (4)
Tb1—O2	2.406 (4)	O2—C1^vii	1.261 (5)
Tb1—O3	2.419 (3)	O2—K1^viii	2.909 (4)
Tb1—O1	2.423 (3)	O3—C2	1.250 (6)
K1—O8ⁱⁱⁱ	2.733 (4)	O3—K1^vii	2.744 (3)
K1—O3^iv	2.744 (3)	O4—C2^iv	1.238 (6)
K1—O1^iv	2.900 (3)	O4—K1^viii	3.105 (4)
K1—O9ⁱ	2.903 (4)	O6—Tb1ⁱ	2.311 (4)
K1—O2^v	2.909 (4)	O7—Tb1^vi	2.325 (4)
K1—O6	2.992 (4)	O8—K1ⁱⁱⁱ	2.733 (4)
K1—O1^vi	3.016 (4)	O9—K1ⁱ	2.903 (4)
K1—O4	3.032 (4)	O9—H9A	0.96 (6)
K1—O4^v	3.105 (4)	O9—H9B	0.97 (6)
K1—C2^iv	3.132 (5)	C1—O2^iv	1.261 (5)
K1—C1^vi	3.141 (6)	C1—C2^iv	1.532 (7)
K1—S1ⁱⁱⁱ	3.7251 (18)	C2—O4^vii	1.238 (6)
S1—O8	1.455 (4)	C2—C1^vii	1.532 (7)
S1—O7	1.470 (4)

O6ⁱ—Tb1—O5	75.84 (12)	O1^vi—K1—O4	80.09 (10)
O6ⁱ—Tb1—O7ⁱⁱ	80.00 (13)	O8ⁱⁱⁱ—K1—O4^v	60.90 (11)
O5—Tb1—O7ⁱⁱ	132.93 (13)	O3^iv—K1—O4^v	110.83 (11)
O6ⁱ—Tb1—O9	96.65 (12)	O1^iv—K1—O4^v	80.67 (10)
O5—Tb1—O9	70.62 (12)	O9ⁱ—K1—O4^v	80.98 (10)
O7ⁱⁱ—Tb1—O9	72.86 (12)	O2^v—K1—O4^v	57.98 (10)
O5—Tb1—O4	78.58 (12)	O6—K1—O4^v	136.94 (9)
O7ⁱⁱ—Tb1—O4	138.98 (12)	O1^vi—K1—O4^v	95.21 (11)
O9—Tb1—O4	147.42 (11)	O4—K1—O4^v	153.72 (5)
O6ⁱ—Tb1—O2	146.78 (11)	O8—S1—O7	111.1 (2)
O5—Tb1—O2	74.00 (11)	O8—S1—O5	109.5 (2)
O7ⁱⁱ—Tb1—O2	131.70 (12)	O7—S1—O5	108.3 (2)
O9—Tb1—O2	86.26 (13)	O8—S1—O6	109.8 (2)
O4—Tb1—O2	75.09 (13)	O7—S1—O6	108.2 (2)
O6ⁱ—Tb1—O3	147.54 (12)	O5—S1—O6	109.9 (2)
O5—Tb1—O3	133.59 (11)	C1—O1—Tb1	117.0 (3)
O7ⁱⁱ—Tb1—O3	69.30 (12)	C1—O1—K1^vii	122.4 (3)
O4—Tb1—O3	110.60 (12)	Tb1—O1—K1^vii	110.02 (12)
O2—Tb1—O3	65.64 (12)	C1—O1—K1ⁱⁱ	84.2 (3)
O6ⁱ—Tb1—O1	90.64 (12)	Tb1—O1—K1ⁱⁱ	121.87 (14)
O5—Tb1—O1	144.76 (13)	K1^vii—O1—K1ⁱⁱ	98.21 (10)
O9—Tb1—O1	144.20 (12)	C1^vii—O2—Tb1	119.4 (3)
O4—Tb1—O1	67.90 (12)	C1^vii—O2—K1^viii	88.6 (3)
O2—Tb1—O1	106.20 (11)	Tb1—O2—K1^viii	116.49 (13)
O3—Tb1—O1	71.38 (11)	C2—O3—Tb1	119.0 (3)
O8ⁱⁱⁱ—K1—O3^iv	155.77 (13)	C2—O3—K1^vii	96.0 (3)
O8ⁱⁱⁱ—K1—O1^iv	133.26 (11)	Tb1—O3—K1^vii	115.52 (14)
O3^iv—K1—O1^iv	59.99 (10)	C2^iv—O4—Tb1	118.6 (3)
O8ⁱⁱⁱ—K1—O9ⁱ	74.43 (11)	C2^iv—O4—K1	83.0 (3)
O3^iv—K1—O9ⁱ	128.67 (11)	Tb1—O4—K1	139.97 (14)
O1^iv—K1—O9ⁱ	74.15 (10)	C2^iv—O4—K1^viii	105.0 (3)
O8ⁱⁱⁱ—K1—O2^v	68.22 (11)	Tb1—O4—K1^viii	110.44 (12)
O3^iv—K1—O2^v	87.98 (11)	K1—O4—K1^viii	93.58 (10)
O1^iv—K1—O2^v	114.22 (11)	S1—O5—Tb1	149.7 (2)
O9ⁱ—K1—O2^v	134.04 (11)	S1—O6—Tb1ⁱ	138.2 (2)
O8ⁱⁱⁱ—K1—O6	79.21 (11)	S1—O6—K1	126.8 (2)
O3^iv—K1—O6	112.22 (11)	Tb1ⁱ—O6—K1	94.79 (12)
O1^iv—K1—O6	122.12 (12)	S1—O7—Tb1^vi	144.5 (2)
O9ⁱ—K1—O6	72.82 (10)	S1—O8—K1ⁱⁱⁱ	122.7 (2)
O2^v—K1—O6	123.02 (10)	Tb1—O9—K1ⁱ	95.73 (12)
O8ⁱⁱⁱ—K1—O1^vi	63.92 (11)	Tb1—O9—H9A	113 (4)
O3^iv—K1—O1^vi	96.12 (11)	K1ⁱ—O9—H9A	113 (4)
O1^iv—K1—O1^vi	151.31 (6)	Tb1—O9—H9B	149 (4)
O9ⁱ—K1—O1^vi	133.59 (10)	K1ⁱ—O9—H9B	75 (6)
O2^v—K1—O1^vi	44.18 (10)	H9A—O9—H9B	97.7 (13)
O6—K1—O1^vi	79.92 (11)	O1—C1—O2^iv	126.4 (5)
O8ⁱⁱⁱ—K1—O4	134.96 (11)	O1—C1—C2^iv	117.6 (4)
O3^iv—K1—O4	45.03 (10)	O2^iv—C1—C2^iv	116.0 (5)
O1^iv—K1—O4	91.10 (10)	O4^vii—C2—O3	127.1 (5)
O9ⁱ—K1—O4	120.90 (11)	O4^vii—C2—C1^vii	117.8 (5)
O2^v—K1—O4	104.49 (11)	O3—C2—C1^vii	115.0 (4)
O6—K1—O4	68.10 (9)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O9—H9A···O2^ix	0.96 (6)	1.88 (4)	2.731 (4)	145 (5)
O9—H9B···O3^x	0.96 (6)	1.86 (3)	2.787 (5)	160 (9)
O9—H9B···O7^ix	0.97 (6)	2.83 (9)	3.149 (5)	100 (6)

Symmetry codes: (ix) −x+1, −y+1, −z; (x) −x, −y+1, −z.

Experimental details

Crystal data
Chemical formula	KTb(C₂O₄)(SO₄)(H₂O)
M_r	400.14
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	113
a, b, c (Å)	6.5274 (13), 8.5072 (17), 14.591 (4)
β (°)	112.65 (3)
V (Å³)	747.7 (3)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	10.32
Crystal size (mm)	0.06 × 0.04 × 0.02

Data collection
Diffractometer	Bruker SMART 1000 CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 2003)
T_min, T_max	0.576, 0.820
No. of measured, independent and observed [I > 2σ(I)] reflections	4812, 1317, 1079
R_int	0.057
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.023, 0.051, 1.05
No. of reflections	1317
No. of parameters	127
No. of restraints	24
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.92, −0.78

Computer programs: SMART (Bruker, 2001), SAINT (Bruker, 2001), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), DIAMOND (Brandenburg, 1998), SHELXTL (Sheldrick, 2008).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O9—H9A···O2ⁱ	0.96 (6)	1.88 (4)	2.731 (4)	145 (5)
O9—H9B···O3ⁱⁱ	0.96 (6)	1.86 (3)	2.787 (5)	160 (9)
O9—H9B···O7ⁱ	0.97 (6)	2.83 (9)	3.149 (5)	100 (6)

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

Acknowledgements

This project was sponsored by SRF for ROCS, SEM, and the Research Foundation of Education Department of Liaoning Province (No. 2008581).

References

Audebrand, N., Raite, S. & Louer, D. (2003). Solid State Sci. 5, 783–794. Web of Science CSD CrossRef CAS Google Scholar
Brandenburg, K. (1998). DIAMOND. Crystal Impact GbR, Bonn, Germany. Google Scholar
Bruker (2001). SAINT and SMART. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Dean, P. A. W., Craig, D., Dance, I., Russell, V. & Scudder, M. (2004). Inorg. Chem. 43, 443–449. Web of Science CSD CrossRef PubMed CAS Google Scholar
Lu, J., Li, Y., Zhao, K., Xu, J.-Q., Yu, J.-H., Li, G.-H., Zhang, X., Bie, H.-Y. & Wang, T.-G. (2004). Inorg. Chem. Commun. 7, 1154–1156. Web of Science CSD CrossRef CAS Google Scholar
Sheldrick, G. M. (2003). SADABS. University of Göttingen, Germany. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar