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Acta Cryst. (2007). E63, m1956    [ doi:10.1107/S1600536807029200 ]

cis-Dichloridobis(ethyldiphenylphosphine-[kappa]P)platinum(II)

W. Domanska-Babul, J. Chojnacki and J. Pikies

Abstract top

In the title compound, [PtCl2(C14H15P)2], the isomer from the reaction of potassium tetrachloridoplatinate(II) and ethyldiphenylphosphine, the Pt atom is in a square-planar geometry.

Comment top

In the course of our studies upon the reactivity of [(R3P)2MCl2] towards R'2P–P(SiMe3)2 (Domańska-Babul et al., 2007) we have studied the reaction of (iPr2N)2P–P(SiMe3)2 with [(EtPh2P)2PtCl2]. The title compound was obtained unchanged in the synthesis.

The complex exhibits square-planar coordination that is typical for platinum(II) compounds. The platinum atom is 0.0556 (4) Å above the square plane. The structure is similar to that of [(MePh2P)2PtCl2] (Ho et al., 1982). The square planar geometry is characteristic of complexes having less bulky tertiary phosphines. Significant deviation from planarity is observed with sterically bulky phosphines ligands, as noted in cis-dichlorobis(di-t-butylphenylphosphine)platinum(II) (Krautscheid et al., 1997; Porzio et al., 1980). The bond dimensions involving the platinum atom are typical of [cis-(R3P)2PtCl2] compounds such as for [(MePh2P)2PtCl2]. Weak intermolecular C—H···Cl interactions are also present.

Related literature top

For the related cis-dichlorobis(methyldiphenylphosphine)platinum, see Ho et al. (1982).

For related literature, see: Domańska-Babul, Chojnacki, Matern & Pikies (2007); Krautscheid et al. (1997); Porzio et al. (1980).

Experimental top

The compound was been obtained as yellow powder by the reaction of a solution of ethyl(diphenyl)phosphane in ethanol with a solution of potassium tetrachloroplatinate(II) in water. It was obtained in a crystalline habit from the reaction of (iPr2N)2P–P(SiMe3)2 with [(EtPh2P)2PtCl2] a 1:1 molar ratio in THF. Crystals were obtained by recrystallization from pentane at 249 K

Refinement top

All C–H hydrogen atoms were refined as riding on carbon atoms with methyl C–H = 0.98 Å, methylen C–H = 0.99 Å, aromatic C–H = 0.95 Å and Uiso(H)=1.2 Ueq(C) for aromatic CH, 1.3 for CH2 groups and 1.5 for methyl groups.

Computing details top

Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell refinement: CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999) and PLATON (Spek, 2003).

Figures top
[Figure 1] Fig. 1. View of (I) (50% probability displacement ellipsoids)
cis-Dichloridobis(ethyldiphenylphosphine-κP)platinum(II) top
Crystal data top
[PtCl2(C14H15P)2]F000 = 1360
Mr = 694.45Dx = 1.791 Mg m−3
Monoclinic, P21/cMo Kα radiation
λ = 0.71073 Å
Hall symbol: -P 2ybcCell parameters from 9761 reflections
a = 14.2831 (6) Åθ = 2.9–32.5º
b = 11.1025 (5) ŵ = 5.80 mm−1
c = 16.9556 (7) ÅT = 120 (2) K
β = 106.677 (4)ºPrism, yellow
V = 2575.69 (19) Å30.26 × 0.14 × 0.07 mm
Z = 4
Data collection top
Oxford Diffraction KM-4-CCD
diffractometer		5413 reflections with I > 2σ(I)
Monochromator: graphiteRint = 0.032
0.75° ω scansθmax = 27º
Absorption correction: Analytical
CrysAlis RED (Oxford Diffraction, 2006; Clark & Reid, 1995).		θmin = 2.9º
Tmin = 0.232, Tmax = 0.501h = −18→18
19512 measured reflectionsk = −14→14
5614 independent reflectionsl = −21→13
Refinement top
Refinement on F2H-atom parameters constrained
Least-squares matrix: full  w = 1/[σ2(Fo2) + (0.0399P)2 + 6.0673P]
where P = (Fo2 + 2Fc2)/3
R[F2 > 2σ(F2)] = 0.029(Δ/σ)max = 0.001
wR(F2) = 0.072Δρmax = 2.88 e Å−3
S = 1.10Δρmin = −1.23 e Å−3
5614 reflectionsExtinction correction: none
300 parameters
Crystal data top
[PtCl2(C14H15P)2]V = 2575.69 (19) Å3
Mr = 694.45Z = 4
Monoclinic, P21/cMo Kα
a = 14.2831 (6) ŵ = 5.80 mm−1
b = 11.1025 (5) ÅT = 120 (2) K
c = 16.9556 (7) Å0.26 × 0.14 × 0.07 mm
β = 106.677 (4)º
Data collection top
Oxford Diffraction KM-4-CCD
diffractometer		5614 independent reflections
Absorption correction: Analytical
CrysAlis RED (Oxford Diffraction, 2006; Clark & Reid, 1995).		5413 reflections with I > 2σ(I)
Tmin = 0.232, Tmax = 0.501Rint = 0.032
19512 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.029300 parameters
wR(F2) = 0.072H-atom parameters constrained
S = 1.10Δρmax = 2.88 e Å−3
5614 reflectionsΔρmin = −1.23 e Å−3
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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
Pt10.270906 (9)0.459023 (11)0.282544 (7)0.01446 (6)
P10.15530 (6)0.41497 (8)0.34561 (5)0.01523 (17)
P20.36679 (6)0.29500 (8)0.31639 (5)0.01523 (17)
Cl10.36472 (8)0.53298 (8)0.20004 (6)0.0278 (2)
Cl20.17113 (7)0.62945 (9)0.23685 (6)0.0308 (2)
C10.1445 (3)0.5374 (3)0.4142 (2)0.0167 (7)
C20.0551 (3)0.5606 (3)0.4295 (2)0.0221 (7)
H2−0.00010.51190.40430.027*
C30.0462 (3)0.6541 (3)0.4811 (2)0.0256 (8)
H3−0.01520.66990.49040.031*
C40.1265 (3)0.7245 (3)0.5193 (2)0.0268 (8)
H40.12070.78730.55570.032*
C50.2154 (3)0.7028 (4)0.5043 (2)0.0287 (8)
H50.27050.75130.53010.034*
C60.2243 (3)0.6101 (3)0.4515 (2)0.0244 (8)
H60.28520.59640.4410.029*
C70.1573 (3)0.2795 (3)0.4077 (2)0.0179 (7)
C80.0867 (3)0.1887 (3)0.3837 (2)0.0258 (8)
H80.03620.19620.33330.031*
C90.0898 (4)0.0879 (4)0.4328 (3)0.0357 (10)
H90.04020.02840.41680.043*
C100.1648 (4)0.0736 (4)0.5049 (3)0.0386 (11)
H100.16790.00310.53730.046*
C110.2353 (4)0.1624 (4)0.5297 (2)0.0316 (9)
H110.28740.15240.57880.038*
C120.2297 (3)0.2667 (3)0.4825 (2)0.0227 (7)
H120.27580.32960.50160.027*
C130.0365 (3)0.4052 (4)0.2677 (2)0.0225 (7)
H13A−0.01210.37290.29370.029*
H13B0.01520.48730.24750.029*
C140.0376 (3)0.3256 (4)0.1944 (2)0.0300 (9)
H14A0.07710.36410.16290.045*
H14B−0.02940.31480.1590.045*
H14C0.06570.2470.21440.045*
C150.2996 (3)0.1563 (3)0.2819 (2)0.0181 (7)
C160.2805 (3)0.0686 (3)0.3338 (2)0.0212 (7)
H160.29920.08180.39160.025*
C170.2339 (3)−0.0384 (3)0.3015 (3)0.0237 (8)
H170.2212−0.0980.33730.028*
C180.2061 (3)−0.0577 (4)0.2169 (3)0.0249 (8)
H180.1767−0.13190.19510.03*
C190.2210 (3)0.0305 (4)0.1648 (3)0.0298 (9)
H190.19940.01870.10690.036*
C200.2678 (3)0.1370 (4)0.1970 (2)0.0280 (8)
H200.27820.19740.16070.034*
C210.4359 (2)0.2718 (3)0.4232 (2)0.0184 (7)
C220.4926 (3)0.1674 (4)0.4455 (3)0.0284 (8)
H220.48990.10570.40610.034*
C230.5528 (3)0.1547 (4)0.5254 (3)0.0332 (9)
H230.59130.08390.54020.04*
C240.5576 (3)0.2429 (4)0.5837 (2)0.0333 (10)
H240.59870.23250.63830.04*
C250.5021 (3)0.3470 (4)0.5622 (2)0.0295 (9)
H250.50460.40770.60230.035*
C260.4427 (3)0.3623 (3)0.4817 (2)0.0225 (7)
H260.40660.43480.46660.027*
C270.4649 (3)0.2823 (4)0.2668 (2)0.0232 (7)
H27A0.48630.19720.26970.03*
H27B0.43790.30340.20790.03*
C280.5551 (3)0.3615 (4)0.3040 (3)0.0313 (9)
H28A0.53720.44650.29380.047*
H28B0.60650.34140.27830.047*
H28C0.57910.34720.36340.047*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Pt10.01654 (8)0.01163 (8)0.01519 (8)−0.00052 (4)0.00450 (5)0.00112 (4)
P10.0155 (4)0.0138 (4)0.0161 (4)0.0003 (3)0.0041 (3)−0.0004 (3)
P20.0140 (4)0.0137 (4)0.0174 (4)−0.0005 (3)0.0037 (3)−0.0013 (3)
Cl10.0330 (5)0.0240 (5)0.0315 (5)−0.0059 (4)0.0174 (4)0.0040 (3)
Cl20.0351 (5)0.0213 (4)0.0369 (5)0.0105 (4)0.0121 (4)0.0129 (4)
C10.0216 (17)0.0132 (16)0.0164 (16)0.0034 (12)0.0072 (14)0.0024 (12)
C20.0253 (19)0.0192 (17)0.0244 (18)−0.0008 (14)0.0111 (15)0.0020 (14)
C30.034 (2)0.0206 (18)0.0275 (19)0.0058 (15)0.0176 (16)0.0023 (15)
C40.045 (2)0.0164 (17)0.0201 (17)0.0039 (16)0.0118 (16)−0.0002 (14)
C50.033 (2)0.0226 (19)0.027 (2)−0.0041 (16)0.0029 (16)−0.0045 (16)
C60.0220 (18)0.0225 (18)0.0272 (18)0.0005 (14)0.0045 (15)−0.0034 (15)
C70.0203 (16)0.0157 (16)0.0198 (16)−0.0002 (13)0.0090 (13)−0.0010 (13)
C80.0266 (19)0.0230 (19)0.030 (2)−0.0086 (15)0.0116 (16)−0.0073 (15)
C90.051 (3)0.024 (2)0.040 (2)−0.0164 (19)0.024 (2)−0.0079 (18)
C100.074 (3)0.0173 (19)0.032 (2)−0.006 (2)0.028 (2)0.0026 (17)
C110.052 (3)0.0221 (19)0.0204 (18)0.0032 (18)0.0101 (17)−0.0003 (15)
C120.0294 (19)0.0163 (17)0.0228 (17)0.0001 (14)0.0081 (15)−0.0020 (14)
C130.0164 (16)0.0253 (19)0.0225 (17)0.0018 (14)0.0003 (13)−0.0030 (14)
C140.0258 (19)0.036 (2)0.0238 (19)0.0035 (17)−0.0006 (15)−0.0048 (17)
C150.0174 (16)0.0125 (16)0.0232 (17)0.0018 (13)0.0036 (13)−0.0027 (13)
C160.0215 (17)0.0209 (17)0.0210 (17)0.0003 (14)0.0060 (14)−0.0007 (14)
C170.0224 (19)0.0180 (18)0.032 (2)−0.0005 (13)0.0097 (16)0.0003 (14)
C180.0199 (17)0.0193 (18)0.034 (2)−0.0024 (14)0.0058 (15)−0.0071 (15)
C190.033 (2)0.028 (2)0.025 (2)−0.0058 (16)0.0031 (17)−0.0062 (16)
C200.038 (2)0.0209 (19)0.0211 (18)−0.0082 (16)0.0017 (16)0.0010 (15)
C210.0155 (15)0.0182 (17)0.0182 (16)−0.0031 (13)−0.0006 (12)−0.0014 (13)
C220.0238 (19)0.0234 (19)0.034 (2)0.0019 (15)0.0019 (16)0.0030 (16)
C230.025 (2)0.030 (2)0.038 (2)0.0001 (16)−0.0030 (17)0.0126 (18)
C240.028 (2)0.042 (2)0.0219 (19)−0.0080 (18)−0.0055 (15)0.0113 (18)
C250.031 (2)0.034 (2)0.0212 (18)−0.0110 (17)0.0038 (15)−0.0035 (16)
C260.0209 (17)0.0206 (18)0.0252 (18)−0.0030 (14)0.0051 (14)−0.0007 (14)
C270.0213 (17)0.0238 (18)0.0263 (19)0.0030 (14)0.0099 (15)−0.0041 (15)
C280.0193 (18)0.043 (2)0.032 (2)−0.0063 (17)0.0092 (16)−0.0061 (18)
Geometric parameters (Å, °) top
Pt1—P12.2633 (9)C13—H13A0.99
Pt1—P22.2517 (9)C13—H13B0.99
Pt1—Cl12.3458 (9)C14—H14A0.98
Pt1—Cl22.3618 (9)C14—H14B0.98
P1—C11.824 (3)C14—H14C0.98
P1—C131.830 (4)C15—C161.391 (5)
P1—C71.832 (4)C15—C201.397 (5)
P2—C211.816 (4)C16—C171.394 (5)
P2—C151.820 (4)C16—H160.95
P2—C271.835 (4)C17—C181.391 (6)
C1—C61.391 (5)C17—H170.95
C1—C21.398 (5)C18—C191.376 (6)
C2—C31.387 (5)C18—H180.95
C2—H20.95C19—C201.390 (5)
C3—C41.386 (6)C19—H190.95
C3—H30.95C20—H200.95
C4—C51.385 (6)C21—C261.396 (5)
C4—H40.95C21—C221.403 (5)
C5—C61.394 (5)C22—C231.388 (6)
C5—H50.95C22—H220.95
C6—H60.95C23—C241.379 (7)
C7—C121.395 (5)C23—H230.95
C7—C81.400 (5)C24—C251.390 (6)
C8—C91.388 (6)C24—H240.95
C8—H80.95C25—C261.395 (5)
C9—C101.385 (7)C25—H250.95
C9—H90.95C26—H260.95
C10—C111.386 (7)C27—C281.537 (5)
C10—H100.95C27—H27A0.99
C11—C121.397 (5)C27—H27B0.99
C11—H110.95C28—H28A0.98
C12—H120.95C28—H28B0.98
C13—C141.529 (5)C28—H28C0.98
P2—Pt1—P1100.23 (3)C14—C13—H13B108.9
P2—Pt1—Cl191.45 (3)P1—C13—H13B108.9
P1—Pt1—Cl1167.54 (3)H13A—C13—H13B107.7
P2—Pt1—Cl2175.70 (3)C13—C14—H14A109.5
P1—Pt1—Cl282.81 (3)C13—C14—H14B109.5
Cl1—Pt1—Cl285.30 (3)H14A—C14—H14B109.5
C1—P1—C13105.86 (17)C13—C14—H14C109.5
C1—P1—C7103.62 (15)H14A—C14—H14C109.5
C13—P1—C7102.95 (17)H14B—C14—H14C109.5
C1—P1—Pt1110.29 (12)C16—C15—C20118.7 (3)
C13—P1—Pt1108.86 (13)C16—C15—P2124.8 (3)
C7—P1—Pt1123.80 (11)C20—C15—P2116.6 (3)
C21—P2—C15106.63 (16)C15—C16—C17120.4 (3)
C21—P2—C27100.27 (17)C15—C16—H16119.8
C15—P2—C27100.92 (17)C17—C16—H16119.8
C21—P2—Pt1119.05 (12)C18—C17—C16120.0 (4)
C15—P2—Pt1112.12 (11)C18—C17—H17120
C27—P2—Pt1115.72 (13)C16—C17—H17120
C6—C1—C2118.8 (3)C19—C18—C17120.1 (4)
C6—C1—P1120.9 (3)C19—C18—H18120
C2—C1—P1120.3 (3)C17—C18—H18120
C3—C2—C1120.6 (4)C18—C19—C20119.9 (4)
C3—C2—H2119.7C18—C19—H19120
C1—C2—H2119.7C20—C19—H19120
C4—C3—C2120.2 (4)C19—C20—C15120.9 (4)
C4—C3—H3119.9C19—C20—H20119.6
C2—C3—H3119.9C15—C20—H20119.6
C5—C4—C3119.7 (4)C26—C21—C22119.2 (3)
C5—C4—H4120.1C26—C21—P2120.9 (3)
C3—C4—H4120.1C22—C21—P2119.5 (3)
C4—C5—C6120.2 (4)C23—C22—C21119.7 (4)
C4—C5—H5119.9C23—C22—H22120.2
C6—C5—H5119.9C21—C22—H22120.2
C1—C6—C5120.5 (4)C24—C23—C22121.1 (4)
C1—C6—H6119.8C24—C23—H23119.4
C5—C6—H6119.8C22—C23—H23119.4
C12—C7—C8118.4 (3)C23—C24—C25119.7 (4)
C12—C7—P1119.4 (3)C23—C24—H24120.2
C8—C7—P1122.2 (3)C25—C24—H24120.2
C9—C8—C7120.6 (4)C24—C25—C26119.9 (4)
C9—C8—H8119.7C24—C25—H25120
C7—C8—H8119.7C26—C25—H25120
C10—C9—C8120.5 (4)C25—C26—C21120.4 (4)
C10—C9—H9119.8C25—C26—H26119.8
C8—C9—H9119.8C21—C26—H26119.8
C9—C10—C11119.8 (4)C28—C27—P2115.4 (3)
C9—C10—H10120.1C28—C27—H27A108.4
C11—C10—H10120.1P2—C27—H27A108.4
C10—C11—C12120.0 (4)C28—C27—H27B108.4
C10—C11—H11120P2—C27—H27B108.4
C12—C11—H11120H27A—C27—H27B107.5
C7—C12—C11120.7 (4)C27—C28—H28A109.5
C7—C12—H12119.7C27—C28—H28B109.5
C11—C12—H12119.7H28A—C28—H28B109.5
C14—C13—P1113.4 (3)C27—C28—H28C109.5
C14—C13—H13A108.9H28A—C28—H28C109.5
P1—C13—H13A108.9H28B—C28—H28C109.5
P2—Pt1—P1—C1125.44 (12)C7—C8—C9—C10−2.3 (6)
Cl1—Pt1—P1—C1−75.1 (2)C8—C9—C10—C112.2 (7)
Cl2—Pt1—P1—C1−57.64 (13)C9—C10—C11—C120.9 (7)
P2—Pt1—P1—C13−118.82 (13)C8—C7—C12—C113.9 (5)
Cl1—Pt1—P1—C1340.6 (2)P1—C7—C12—C11−177.6 (3)
Cl2—Pt1—P1—C1358.09 (14)C10—C11—C12—C7−4.0 (6)
P2—Pt1—P1—C72.09 (14)C1—P1—C13—C14167.9 (3)
Cl1—Pt1—P1—C7161.55 (18)C7—P1—C13—C14−83.7 (3)
Cl2—Pt1—P1—C7179.01 (14)Pt1—P1—C13—C1449.3 (3)
P1—Pt1—P2—C21−67.66 (14)C21—P2—C15—C1619.0 (4)
Cl1—Pt1—P2—C21116.69 (14)C27—P2—C15—C16123.3 (3)
Cl2—Pt1—P2—C21157.7 (4)Pt1—P2—C15—C16−112.9 (3)
P1—Pt1—P2—C1557.73 (13)C21—P2—C15—C20−159.4 (3)
Cl1—Pt1—P2—C15−117.92 (13)C27—P2—C15—C20−55.1 (3)
Cl2—Pt1—P2—C15−76.9 (5)Pt1—P2—C15—C2068.7 (3)
P1—Pt1—P2—C27172.74 (14)C20—C15—C16—C172.6 (5)
Cl1—Pt1—P2—C27−2.92 (14)P2—C15—C16—C17−175.7 (3)
Cl2—Pt1—P2—C2738.1 (5)C15—C16—C17—C18−0.2 (6)
C13—P1—C1—C6−146.9 (3)C16—C17—C18—C19−2.5 (6)
C7—P1—C1—C6105.2 (3)C17—C18—C19—C202.8 (6)
Pt1—P1—C1—C6−29.3 (3)C18—C19—C20—C15−0.3 (7)
C13—P1—C1—C232.5 (3)C16—C15—C20—C19−2.3 (6)
C7—P1—C1—C2−75.5 (3)P2—C15—C20—C19176.1 (3)
Pt1—P1—C1—C2150.1 (3)C15—P2—C21—C26−138.3 (3)
C6—C1—C2—C3−0.2 (5)C27—P2—C21—C26117.0 (3)
P1—C1—C2—C3−179.6 (3)Pt1—P2—C21—C26−10.3 (3)
C1—C2—C3—C4−1.1 (6)C15—P2—C21—C2249.4 (3)
C2—C3—C4—C51.4 (6)C27—P2—C21—C22−55.4 (3)
C3—C4—C5—C6−0.5 (6)Pt1—P2—C21—C22177.3 (3)
C2—C1—C6—C51.1 (6)C26—C21—C22—C231.3 (6)
P1—C1—C6—C5−179.5 (3)P2—C21—C22—C23173.9 (3)
C4—C5—C6—C1−0.8 (6)C21—C22—C23—C240.2 (6)
C1—P1—C7—C12−58.4 (3)C22—C23—C24—C25−0.6 (7)
C13—P1—C7—C12−168.6 (3)C23—C24—C25—C26−0.7 (6)
Pt1—P1—C7—C1267.8 (3)C24—C25—C26—C212.3 (6)
C1—P1—C7—C8120.0 (3)C22—C21—C26—C25−2.6 (6)
C13—P1—C7—C89.8 (3)P2—C21—C26—C25−175.0 (3)
Pt1—P1—C7—C8−113.8 (3)C21—P2—C27—C28−51.3 (3)
C12—C7—C8—C9−0.8 (6)C15—P2—C27—C28−160.6 (3)
P1—C7—C8—C9−179.2 (3)Pt1—P2—C27—C2878.1 (3)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
C13—H13B···Cl20.992.783.278 (4)112
C18—H18···Cl2i0.952.753.539 (4)141
C27—H27A···Cl1ii0.992.743.622 (4)149
C27—H27B···Cl10.992.743.185 (4)108
C28—H28A···Cl10.982.703.373 (5)126
Symmetry codes: (i) x, y−1, z; (ii) −x+1, y−1/2, −z+1/2.
Table 1
Selected geometric parameters (Å) top
Pt1—P12.2633 (9)Pt1—Cl12.3458 (9)
Pt1—P22.2517 (9)Pt1—Cl22.3618 (9)
Acknowledgements top

WD—B and JP thank the Polish State Committee of Scientific Research (project No. 1 T09A 148 30) for financial support.

references
References top

Clark, R. C. & Reid, J. S. (1995). Acta Cryst. A51, 887–897.

Domańska-Babul, W., Chojnacki, J., Matern, E. & Pikies, J. (2007). J. Organometal. Chem. (In the press).

Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565–?.

Farrugia, L. J. (1999). J. Appl. Cryst. 32, 837–838.

Ho, K.-C., McLaughlin, G. M., McPartlin, M. & Robertson, G. B. (1982). Acta Cryst. B38, 421–425.

Krautscheid, H., Matern, E., Kovacs, I., Fritz, G. & Pikies, J. (1997). Z. Anorg. Allg. Chem. 623, 1917–1924.

Oxford Diffraction (2006). CrysAlis CCD and CrysAlis RED. Version 1.171.29.9. Oxford Diffraction Ltd, Abingdon, Oxfordshire, England.

Porzio, W., Musco, A. & Immirzi, A. (1980). Inorg. Chem. 19, 2537–2540.

Sheldrick, G. M. (1997). SHELXS97 and SHELXL97. University of Göttingen, Germany.

Spek, A. L. (2003). J. Appl. Cryst. 36, 7–13.