[μ-Bis(diphenyl­phosphan­yl)acetonitrile-κ2P:P]bis­[chloridogold(I)]

Sithole, S.V.; Staples, R.J.; van Zyl, W.E.

doi:10.1107/S1600536810049834

metal-organic compounds

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Volume 67| Part 1| January 2011| Page m64

https://doi.org/10.1107/S1600536810049834

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[μ-Bis(diphenylphosphanyl)acetonitrile-κ²P:P]bis[chloridogold(I)]

Sicelo V. Sithole,^a Richard J. Staples ^b and Werner E. van Zyl ^a ^*

^aSchool of Chemistry, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa, and ^bDepartment of Chemistry, Michigan State University, East Lansing, MI 48824-1322, USA
^*Correspondence e-mail: vanzylw@ukzn.ac.za

(Received 26 November 2010; accepted 29 November 2010; online 11 December 2010)

The title complex, [Au₂Cl₂(C₂₆H₂₁NP₂)], has an intramolecular Au⋯Au interaction of 3.1669 (4) Å, but no intermolecular Au⋯Au interactions in the solid state. The Cl—Au—P bond angle of 176.84 (7)° is slightly distorted from linearity. The P—C bond length to the phenyl group is shorter [1.810 (7) Å] than the P—C bond length [1.876 (7) Å] to the bridging carbon, indicative of the flexibility of the bidentate bite of the ligand. The C—C≡N fragment is essentially linear at 179.5 (9)° and the C≡N bond length of 1.125 (11) Å indicates predominantly triple-bond character. In the crystal packing, there are no hydrogen-bonding or aurophilic interactions between the molecules.

Related literature

For background to bis(diphenylphosphane)methane, Ph₂PCH₂PPh₂, (dppm), see: Puddephatt (1983 ); Minahan & Hill (1984 ). For polymorphs of the related complex [(AuCl)₂(dppm)], see: Schmidbaur et al. (1977 ); Healy (2003 ). For use of the anionic version of the ligand used in the present study, see: Ruiz et al. (1996 ); Mosquera et al. (2001 ). For recent work on bis(diphenylphosphane)acetonitrile, see: Braun et al. (2007 ); Spannhoff et al. (2009 ). For background to our interest in dinuclear gold(I) complexes, see: Van Zyl (2010 ).

Experimental

Crystal data

[Au₂Cl₂(C₂₆H₂₁NP₂)]
M_r = 874.21
Orthorhombic, P n a 2₁
a = 13.9062 (8) Å
b = 12.6837 (7) Å
c = 14.7938 (8) Å
V = 2609.4 (3) Å³
Z = 4
Mo Kα radiation
μ = 11.58 mm⁻¹
T = 173 K
0.22 × 0.21 × 0.19 mm

Data collection

Bruker APEXII CCD diffractometer
Absorption correction: multi-scan (SADABS; Bruker, 2009 ) T_min = 0.189, T_max = 0.216
35892 measured reflections
4770 independent reflections
4621 reflections with I > 2σ(I)
R_int = 0.059

Refinement

R[F² > 2σ(F²)] = 0.025
wR(F²) = 0.063
S = 1.05
4770 reflections
298 parameters
1 restraint
H-atom parameters constrained
Δρ_max = 0.76 e Å⁻³
Δρ_min = −0.81 e Å⁻³
Absolute structure: Flack (1983 ), 2283 Friedel pairs
Flack parameter: 0.014 (8)

Data collection: COSMO (Bruker, 2009); cell refinement: APEX2 (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S1600536810049834/fj2370sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810049834/fj2370Isup2.hkl

checkCIF report

Comment top

Interest in the chemistry of the ligand bis(diphenylphosphane)acetonitrile, (dppm-CN), was recently rejuvenated with the facile preparation thereof starting with readily available acetonitrile (Braun et al., 2007). Development of its chemistry followed thereafter, including the observed sharp increase in acidity by the replacement of a proton with a cyano group on the bridging carbon atom of the related ligand dppm (Spannhoff et al., 2009, and references therein). We prepared dppm-CN through slight modification of the stoichiometric amounts used in the literature procedure (Braun et al., 2007). Acetonitrile was doubly deprotonated with n-BuLi (2 molar equivalents) to yield the proposed intermediate Li₂[CHCN] (not isolated), which was treated in situ with Ph₂PCl (2 molar equivalents) to form dppm-CN. In continuing our interest in dinuclear gold(I) complexes (Van Zyl, 2010), we report the first structural investigation of a gold(I) complex with the ligand dppm-CN. Complex (I) was formed in CH₂Cl₂ solution from the reaction between the ligand and [AuCl(tht)] (tht = tetrahydrothiophene) (molar ratio 1:2) (see Experimental). The solution ³¹P NMR spectrum of complex(I) showed a singlet peak resonating at δ = 34.8 p.p.m. for the two equivalent P atoms. Complex (I) can be compared with the related [(AuCl)₂dppm] complex which exists as two polymorphs. The first polymorph (monoclinic) (Schmidbaur et al., 1977) contains an intramolecular Au···Au interaction of 3.351 (2) Å with no intermolecular Au···Au interaction, whilst the second polymorph (triclinic) (Healy, 2003) contains neither intra- (5.617 (3) Å) nor intermolecular Au···Au interactions. The cause for the structural difference between the two polymorphs can be found in two different conformational structures of the dppm ligand.

Related literature top

For background to bis(diphenylphosphane)methane, Ph₂PCH₂PPh₂, (dppm), see: Puddephatt (1983); Minahan et al. (1984). For polymorphs of the related complex [(AuCl)₂(dppm)], see: Schmidbaur et al. (1977); Healy (2003). For use of the anionic version of the ligand used in the present study, see: Ruiz et al. (1996); Mosquera et al. (2001). For recent work on bis(diphenylphosphane)acetonitrile, see: Braun et al. (2007); Spannhoff et al. (2009). For background to our interest in dinuclear gold(I) complexes, see: Van Zyl (2010).

Experimental top

Preparation and characterization of complex(I): A solution of [AuCl(tht)] (156 mg, 0.48 mmol) in dichloromethane (10 ml) was slowly added to a solution of dppm-CN (100 mg, 0.24 mmol) in dichloromethane (5 ml) and the mixture stirred for 45 minutes at room temperature. All solvent and tht were then removed under reduced pressure to give complex (I). Dry Et₂O (3 x 2 ml) was used to wash the product which was then further dried in vacuo overnight. The product was obtained as a free-flowing off-white powder. Yield (185 mg, 0.21 mmol) 88%. Mp: 155–158 °C; Elemental analysis for complex C₂₆H₂₁Au₂Cl₂NP₂ Found: C, 35.21; H, 2.28 requires C, 35.72; H, 2.42%. ¹H NMR (400 MHz, CDCl₃, 298 K) δ_H= 7.68–7.53 (m, 20H, Ph); 5.52 (t, 1H; CH, ²J_P,H = 12.77 Hz). ³¹P NMR (101 MHz, CDCl₃, 298 K) δ_P= 34.8 (s, 2P). IR (KBr, cm^-1): 2243 ν(CN). ESI-MS: m/z 875 [M+]. Single crystals were obtained by slow diffusion of dry hexane into a saturated solution of dry dichloromethane.

Structure description top

Computing details top

Data collection: COSMO (Bruker, 2009); cell refinement: APEX2 (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

Fig. 1. Molecular structure of the title complex showing the atom numbering scheme. Ellipsoids are drawn at the 50% probability level.

[µ-Bis(diphenylphosphanyl)acetonitrile- κ²P:P]bis[chloridogold(I)] top

Crystal data top

[Au₂Cl₂(C₂₆H₂₁NP₂)]	F(000) = 1624
M_r = 874.21	D_x = 2.225 Mg m⁻³
Orthorhombic, Pna2₁	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: P 2c -2n	Cell parameters from 9778 reflections
a = 13.9062 (8) Å	θ = 2.6–25.3°
b = 12.6837 (7) Å	µ = 11.58 mm⁻¹
c = 14.7938 (8) Å	T = 173 K
V = 2609.4 (3) Å³	Chunk, colourless
Z = 4	0.22 × 0.21 × 0.19 mm

Data collection top

Bruker APEXII CCD diffractometer	4770 independent reflections
Radiation source: fine-focus sealed tube	4621 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.059
Detector resolution: 836.6 pixels mm^-1	θ_max = 25.4°, θ_min = 2.1°
ω and φ 0.5° scans	h = −16→16
Absorption correction: multi-scan (SADABS; Bruker, 2009)	k = −15→15
T_min = 0.189, T_max = 0.216	l = −17→17
35892 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.025	H-atom parameters constrained
wR(F²) = 0.063	w = 1/[σ²(F_o²) + (0.011P)² + 3.9118P] where P = (F_o² + 2F_c²)/3
S = 1.05	(Δ/σ)_max = 0.001
4770 reflections	Δρ_max = 0.76 e Å⁻³
298 parameters	Δρ_min = −0.81 e Å⁻³
1 restraint	Absolute structure: Flack (1983), 2283 Friedel pairs
Primary atom site location: structure-invariant direct methods	Absolute structure parameter: 0.014 (8)

Crystal data top

[Au₂Cl₂(C₂₆H₂₁NP₂)]	V = 2609.4 (3) Å³
M_r = 874.21	Z = 4
Orthorhombic, Pna2₁	Mo Kα radiation
a = 13.9062 (8) Å	µ = 11.58 mm⁻¹
b = 12.6837 (7) Å	T = 173 K
c = 14.7938 (8) Å	0.22 × 0.21 × 0.19 mm

Data collection top

Bruker APEXII CCD diffractometer	4770 independent reflections
Absorption correction: multi-scan (SADABS; Bruker, 2009)	4621 reflections with I > 2σ(I)
T_min = 0.189, T_max = 0.216	R_int = 0.059
35892 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.025	H-atom parameters constrained
wR(F²) = 0.063	Δρ_max = 0.76 e Å⁻³
S = 1.05	Δρ_min = −0.81 e Å⁻³
4770 reflections	Absolute structure: Flack (1983), 2283 Friedel pairs
298 parameters	Absolute structure parameter: 0.014 (8)
1 restraint

Special details top

Experimental. Data was collected using a BRUKER CCD (charge coupled device) based diffractometer equipped with an Oxford low-temperature apparatus operating at 173 K. A suitable crystal was chosen and mounted on a glass fiber or nylon loop using Paratone oil for Mo radiation and Mineral oil for Copper radiation. Data were measured using omega and phi scans of 0.5° per frame for 30 s. The total number of images were based on results from the program COSMO where redundancy was expected to be 4 and completeness to 0.83Å to 100%. Cell parameters were retrieved using APEX II software and refined using SAINT on all observed reflections.Data reduction was performed using the SAINT software which corrects for Lp. Scaling and absorption corrections were applied using SADABS6 multi-scan technique, supplied by George Sheldrick. The structures are solved by the direct method using the SHELXS97 program and refined by least squares method on F2, SHELXL97, incorporated in SHELXTL.

All H atoms were placed in calculated positions and refined using a riding model. C—H(aromatic) = 0.94 Å and U_iso(H) = 1.2Ueq(C) C—H (alaphatic) = 0.99 Å and U_iso(H) = 1.2Ueq(C) CH2 = 0.98 Å and U_iso(H) = 1.2Ueq(C) CH3 = 0.97Å and U_iso(H) = 1.5Ueq(C) N—H = 0.86 (0.92)Å and U_iso(H) = 1.2 U_eq(N) O—H(alcohol) = 0.85Åand U_iso(H) = 1.2Ueq(O) O—H(acid) = 0.82 Å and U_iso(H) = 1.5Ueq(O)

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
Cl1	−0.07615 (15)	0.82567 (17)	0.92236 (14)	0.0565 (5)
Au1	−0.059247 (18)	0.86691 (2)	0.77316 (2)	0.04850 (8)
Au2	0.148444 (19)	0.78078 (2)	0.72563 (2)	0.05055 (8)
C4	−0.0452 (5)	0.8105 (7)	0.4587 (5)	0.0498 (17)
H4	−0.0476	0.8790	0.4328	0.060*
Cl2	0.13552 (17)	0.64675 (18)	0.82822 (17)	0.0687 (5)
P2	0.16917 (13)	0.90358 (15)	0.61806 (13)	0.0437 (4)
P1	−0.05098 (13)	0.91073 (16)	0.62748 (13)	0.0445 (4)
C5	−0.0428 (6)	0.7239 (8)	0.4036 (6)	0.063 (2)
H5	−0.0420	0.7325	0.3398	0.076*
C6	−0.0414 (6)	0.6240 (7)	0.4409 (6)	0.057 (2)
H6	−0.0424	0.5640	0.4025	0.069*
C7	−0.0388 (5)	0.6106 (6)	0.5327 (6)	0.0510 (17)
H7	−0.0357	0.5417	0.5577	0.061*
C8	−0.0406 (5)	0.6990 (6)	0.5898 (6)	0.0501 (17)
H8	−0.0394	0.6905	0.6536	0.060*
C3	−0.0442 (5)	0.7994 (5)	0.5514 (5)	0.0408 (14)
C15	0.2655 (5)	0.9971 (6)	0.6416 (5)	0.0490 (17)
C16	0.3248 (5)	0.9752 (7)	0.7136 (5)	0.0539 (18)
H16	0.3108	0.9175	0.7523	0.065*
C17	0.4056 (6)	1.0377 (7)	0.7298 (7)	0.070 (2)
H17	0.4486	1.0205	0.7775	0.083*
C19	0.3635 (6)	1.1447 (7)	0.6058 (8)	0.068 (3)
H19	0.3775	1.2027	0.5674	0.082*
C20	0.2838 (5)	1.0835 (6)	0.5887 (6)	0.0572 (19)
H20	0.2416	1.1012	0.5405	0.069*
C1	0.0603 (5)	0.9886 (5)	0.6014 (5)	0.0449 (16)
H1	0.0579	1.0120	0.5370	0.054*
C9	−0.1500 (5)	0.9924 (6)	0.5901 (5)	0.0480 (17)
C10	−0.1467 (5)	1.0590 (7)	0.5165 (6)	0.058 (2)
H10	−0.0883	1.0675	0.4839	0.069*
C11	−0.2286 (6)	1.1138 (6)	0.4897 (7)	0.065 (2)
H11	−0.2268	1.1594	0.4388	0.078*
C14	−0.2361 (5)	0.9810 (5)	0.6381 (5)	0.0496 (17)
H14	−0.2393	0.9350	0.6887	0.059*
C2	0.0620 (5)	1.0809 (7)	0.6594 (6)	0.057 (2)
N1	0.0639 (6)	1.1521 (7)	0.7045 (7)	0.086 (3)
C21	0.1903 (5)	0.8482 (6)	0.5076 (5)	0.0443 (15)
C22	0.1955 (6)	0.9097 (6)	0.4297 (5)	0.0536 (18)
H22	0.1890	0.9842	0.4333	0.064*
C23	0.2103 (6)	0.8614 (8)	0.3471 (6)	0.064 (2)
H23	0.2137	0.9033	0.2940	0.077*
C25	0.2138 (6)	0.6929 (7)	0.4167 (6)	0.0544 (18)
H25	0.2198	0.6185	0.4122	0.065*
C26	0.1985 (5)	0.7393 (5)	0.4999 (5)	0.0477 (17)
H26	0.1935	0.6964	0.5523	0.057*
C18	0.4224 (6)	1.1235 (7)	0.6765 (8)	0.070 (3)
H18	0.4754	1.1684	0.6890	0.085*
C24	0.2203 (6)	0.7542 (7)	0.3403 (6)	0.0578 (19)
H24	0.2317	0.7224	0.2832	0.069*
C13	−0.3161 (6)	1.0369 (7)	0.6115 (6)	0.0594 (19)
H13	−0.3741	1.0303	0.6450	0.071*
C12	−0.3136 (6)	1.1007 (7)	0.5390 (7)	0.067 (2)
H12	−0.3701	1.1372	0.5211	0.080*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cl1	0.0629 (12)	0.0548 (11)	0.0517 (11)	0.0020 (9)	0.0055 (9)	−0.0002 (9)
Au1	0.04863 (14)	0.05302 (15)	0.04384 (14)	0.00237 (11)	0.00289 (15)	−0.00088 (14)
Au2	0.05242 (15)	0.05362 (15)	0.04561 (14)	0.00443 (12)	−0.00177 (14)	0.00171 (15)
C4	0.041 (4)	0.059 (4)	0.050 (4)	0.006 (3)	0.003 (3)	0.002 (3)
Cl2	0.0773 (14)	0.0705 (13)	0.0582 (12)	0.0084 (11)	0.0039 (11)	0.0115 (10)
P2	0.0410 (9)	0.0456 (10)	0.0444 (9)	0.0022 (7)	−0.0042 (8)	−0.0037 (8)
P1	0.0394 (9)	0.0489 (10)	0.0453 (10)	0.0034 (7)	−0.0022 (7)	−0.0012 (8)
C5	0.056 (5)	0.093 (7)	0.041 (4)	0.004 (4)	0.002 (4)	−0.006 (4)
C6	0.046 (4)	0.063 (5)	0.063 (5)	−0.009 (4)	0.009 (4)	−0.020 (4)
C7	0.049 (4)	0.048 (4)	0.056 (5)	−0.007 (3)	0.009 (4)	−0.009 (3)
C8	0.049 (4)	0.047 (4)	0.055 (4)	−0.014 (3)	0.004 (3)	−0.003 (3)
C3	0.034 (3)	0.047 (4)	0.041 (4)	−0.002 (3)	−0.004 (3)	0.001 (3)
C15	0.040 (3)	0.052 (4)	0.055 (4)	0.005 (3)	−0.006 (3)	−0.016 (3)
C16	0.045 (4)	0.071 (5)	0.046 (4)	0.003 (3)	0.001 (3)	−0.016 (4)
C17	0.059 (4)	0.084 (6)	0.066 (5)	0.002 (4)	−0.018 (5)	−0.019 (5)
C19	0.055 (5)	0.044 (4)	0.106 (8)	−0.002 (3)	−0.003 (5)	−0.005 (4)
C20	0.047 (4)	0.046 (4)	0.078 (5)	0.001 (3)	−0.008 (4)	−0.005 (4)
C1	0.044 (4)	0.045 (4)	0.046 (4)	0.005 (3)	−0.005 (3)	−0.007 (3)
C9	0.043 (4)	0.047 (4)	0.054 (4)	0.008 (3)	−0.002 (3)	−0.005 (3)
C10	0.046 (4)	0.061 (5)	0.066 (5)	−0.001 (3)	−0.002 (4)	0.012 (4)
C11	0.063 (5)	0.050 (5)	0.082 (6)	−0.001 (4)	−0.021 (5)	0.012 (4)
C14	0.051 (4)	0.040 (4)	0.058 (4)	−0.002 (3)	0.001 (3)	−0.007 (3)
C2	0.042 (4)	0.063 (5)	0.067 (5)	0.005 (3)	−0.008 (4)	−0.017 (4)
N1	0.072 (5)	0.071 (5)	0.115 (8)	0.014 (4)	−0.015 (5)	−0.045 (5)
C21	0.033 (3)	0.052 (4)	0.048 (4)	−0.001 (3)	−0.004 (3)	−0.006 (3)
C22	0.063 (5)	0.045 (4)	0.052 (4)	0.000 (4)	0.005 (4)	0.001 (3)
C23	0.066 (5)	0.076 (6)	0.051 (5)	0.002 (4)	0.007 (4)	0.007 (4)
C25	0.049 (4)	0.053 (4)	0.061 (5)	0.001 (3)	−0.003 (4)	−0.012 (4)
C26	0.043 (4)	0.045 (4)	0.055 (4)	−0.001 (3)	−0.007 (3)	0.003 (3)
C18	0.052 (5)	0.059 (5)	0.100 (7)	−0.002 (4)	0.002 (5)	−0.031 (5)
C24	0.051 (4)	0.072 (5)	0.051 (5)	−0.004 (4)	0.005 (4)	−0.006 (4)
C13	0.046 (4)	0.062 (5)	0.071 (5)	0.000 (4)	−0.003 (4)	−0.003 (4)
C12	0.053 (5)	0.066 (5)	0.082 (6)	0.011 (4)	−0.014 (5)	−0.004 (5)

Geometric parameters (Å, º) top

Cl1—Au1	2.281 (2)	C19—C20	1.377 (11)
Au1—P1	2.229 (2)	C19—H19	0.9500
Au1—Au2	3.1669 (4)	C20—H20	0.9500
Au2—P2	2.245 (2)	C1—C2	1.451 (10)
Au2—Cl2	2.286 (2)	C1—H1	1.0000
C4—C5	1.367 (12)	C9—C10	1.379 (12)
C4—C3	1.379 (11)	C9—C14	1.398 (10)
C4—H4	0.9500	C10—C11	1.391 (11)
P2—C21	1.802 (7)	C10—H10	0.9500
P2—C15	1.822 (7)	C11—C12	1.399 (13)
P2—C1	1.874 (7)	C11—H11	0.9500
P1—C3	1.808 (7)	C14—C13	1.377 (11)
P1—C9	1.810 (7)	C14—H14	0.9500
P1—C1	1.876 (7)	C2—N1	1.125 (11)
C5—C6	1.383 (13)	C21—C26	1.391 (10)
C5—H5	0.9500	C21—C22	1.394 (11)
C6—C7	1.369 (13)	C22—C23	1.383 (12)
C6—H6	0.9500	C22—H22	0.9500
C7—C8	1.404 (10)	C23—C24	1.370 (12)
C7—H7	0.9500	C23—H23	0.9500
C8—C3	1.396 (10)	C25—C24	1.374 (12)
C8—H8	0.9500	C25—C26	1.381 (11)
C15—C20	1.371 (11)	C25—H25	0.9500
C15—C16	1.375 (10)	C26—H26	0.9500
C16—C17	1.396 (11)	C18—H18	0.9500
C16—H16	0.9500	C24—H24	0.9500
C17—C18	1.364 (14)	C13—C12	1.344 (13)
C17—H17	0.9500	C13—H13	0.9500
C19—C18	1.355 (15)	C12—H12	0.9500

P1—Au1—Cl1	176.84 (7)	C15—C20—H20	120.1
P1—Au1—Au2	79.88 (5)	C19—C20—H20	120.1
Cl1—Au1—Au2	103.28 (5)	C2—C1—P2	112.0 (5)
P2—Au2—Cl2	175.21 (8)	C2—C1—P1	108.4 (5)
P2—Au2—Au1	92.01 (5)	P2—C1—P1	109.7 (4)
Cl2—Au2—Au1	92.15 (6)	C2—C1—H1	108.9
C5—C4—C3	120.7 (8)	P2—C1—H1	108.9
C5—C4—H4	119.6	P1—C1—H1	108.9
C3—C4—H4	119.6	C10—C9—C14	119.5 (6)
C21—P2—C15	107.9 (3)	C10—C9—P1	124.5 (6)
C21—P2—C1	103.7 (3)	C14—C9—P1	115.9 (6)
C15—P2—C1	104.1 (3)	C9—C10—C11	120.2 (8)
C21—P2—Au2	113.2 (3)	C9—C10—H10	119.9
C15—P2—Au2	114.2 (3)	C11—C10—H10	119.9
C1—P2—Au2	112.8 (3)	C10—C11—C12	118.9 (8)
C3—P1—C9	107.2 (3)	C10—C11—H11	120.5
C3—P1—C1	103.9 (3)	C12—C11—H11	120.5
C9—P1—C1	105.3 (3)	C13—C14—C9	119.6 (7)
C3—P1—Au1	114.2 (2)	C13—C14—H14	120.2
C9—P1—Au1	113.5 (3)	C9—C14—H14	120.2
C1—P1—Au1	111.9 (2)	N1—C2—C1	179.5 (9)
C4—C5—C6	119.9 (8)	C26—C21—C22	118.9 (7)
C4—C5—H5	120.0	C26—C21—P2	118.4 (6)
C6—C5—H5	120.0	C22—C21—P2	122.7 (6)
C7—C6—C5	120.7 (8)	C23—C22—C21	119.4 (8)
C7—C6—H6	119.7	C23—C22—H22	120.3
C5—C6—H6	119.7	C21—C22—H22	120.3
C6—C7—C8	119.8 (8)	C24—C23—C22	121.3 (8)
C6—C7—H7	120.1	C24—C23—H23	119.3
C8—C7—H7	120.1	C22—C23—H23	119.3
C3—C8—C7	119.0 (8)	C24—C25—C26	120.1 (8)
C3—C8—H8	120.5	C24—C25—H25	120.0
C7—C8—H8	120.5	C26—C25—H25	120.0
C4—C3—C8	119.9 (7)	C25—C26—C21	120.6 (7)
C4—C3—P1	122.6 (6)	C25—C26—H26	119.7
C8—C3—P1	117.5 (6)	C21—C26—H26	119.7
C20—C15—C16	119.4 (7)	C19—C18—C17	120.1 (8)
C20—C15—P2	123.2 (6)	C19—C18—H18	120.0
C16—C15—P2	117.3 (6)	C17—C18—H18	120.0
C15—C16—C17	120.2 (8)	C23—C24—C25	119.6 (8)
C15—C16—H16	119.9	C23—C24—H24	120.2
C17—C16—H16	119.9	C25—C24—H24	120.2
C18—C17—C16	119.4 (9)	C12—C13—C14	121.1 (8)
C18—C17—H17	120.3	C12—C13—H13	119.5
C16—C17—H17	120.3	C14—C13—H13	119.5
C18—C19—C20	121.1 (10)	C13—C12—C11	120.7 (8)
C18—C19—H19	119.4	C13—C12—H12	119.7
C20—C19—H19	119.4	C11—C12—H12	119.7
C15—C20—C19	119.7 (8)

P1—Au1—Au2—P2	29.20 (7)	C21—P2—C1—P1	92.2 (4)
Cl1—Au1—Au2—P2	−150.94 (7)	C15—P2—C1—P1	−155.0 (4)
P1—Au1—Au2—Cl2	−148.43 (8)	Au2—P2—C1—P1	−30.6 (4)
Cl1—Au1—Au2—Cl2	31.43 (9)	C3—P1—C1—C2	179.9 (5)
Au1—Au2—P2—C21	−120.8 (2)	C9—P1—C1—C2	67.3 (6)
Au1—Au2—P2—C15	115.3 (3)	Au1—P1—C1—C2	−56.4 (6)
Au1—Au2—P2—C1	−3.4 (2)	C3—P1—C1—P2	−57.6 (4)
Au2—Au1—P1—C3	64.8 (2)	C9—P1—C1—P2	−170.2 (4)
Au2—Au1—P1—C9	−171.9 (3)	Au1—P1—C1—P2	66.1 (4)
Au2—Au1—P1—C1	−52.9 (2)	C3—P1—C9—C10	−76.6 (8)
C3—C4—C5—C6	1.4 (12)	C1—P1—C9—C10	33.7 (8)
C4—C5—C6—C7	−2.5 (13)	Au1—P1—C9—C10	156.3 (6)
C5—C6—C7—C8	2.1 (12)	C3—P1—C9—C14	100.1 (6)
C6—C7—C8—C3	−0.6 (11)	C1—P1—C9—C14	−149.7 (5)
C5—C4—C3—C8	0.1 (11)	Au1—P1—C9—C14	−27.0 (6)
C5—C4—C3—P1	−178.1 (6)	C14—C9—C10—C11	−0.5 (12)
C7—C8—C3—C4	−0.5 (10)	P1—C9—C10—C11	176.0 (7)
C7—C8—C3—P1	177.8 (5)	C9—C10—C11—C12	0.5 (14)
C9—P1—C3—C4	48.9 (7)	C10—C9—C14—C13	−0.4 (11)
C1—P1—C3—C4	−62.3 (6)	P1—C9—C14—C13	−177.2 (6)
Au1—P1—C3—C4	175.5 (5)	C15—P2—C21—C26	122.9 (6)
C9—P1—C3—C8	−129.4 (6)	C1—P2—C21—C26	−127.0 (6)
C1—P1—C3—C8	119.4 (6)	Au2—P2—C21—C26	−4.4 (6)
Au1—P1—C3—C8	−2.7 (6)	C15—P2—C21—C22	−59.2 (7)
C21—P2—C15—C20	59.5 (7)	C1—P2—C21—C22	50.9 (7)
C1—P2—C15—C20	−50.3 (7)	Au2—P2—C21—C22	173.5 (6)
Au2—P2—C15—C20	−173.8 (6)	C26—C21—C22—C23	−1.1 (12)
C21—P2—C15—C16	−117.1 (6)	P2—C21—C22—C23	−179.0 (7)
C1—P2—C15—C16	133.2 (6)	C21—C22—C23—C24	−0.2 (13)
Au2—P2—C15—C16	9.7 (6)	C24—C25—C26—C21	−0.5 (12)
C20—C15—C16—C17	−3.1 (11)	C22—C21—C26—C25	1.5 (11)
P2—C15—C16—C17	173.5 (6)	P2—C21—C26—C25	179.4 (6)
C15—C16—C17—C18	3.3 (12)	C20—C19—C18—C17	2.9 (15)
C16—C15—C20—C19	2.8 (12)	C16—C17—C18—C19	−3.2 (14)
P2—C15—C20—C19	−173.7 (7)	C22—C23—C24—C25	1.2 (14)
C18—C19—C20—C15	−2.7 (14)	C26—C25—C24—C23	−0.8 (13)
C21—P2—C1—C2	−147.4 (6)	C9—C14—C13—C12	1.4 (12)
C15—P2—C1—C2	−34.5 (7)	C14—C13—C12—C11	−1.5 (14)
Au2—P2—C1—C2	89.8 (6)	C10—C11—C12—C13	0.5 (14)

Experimental details

Crystal data
Chemical formula	[Au₂Cl₂(C₂₆H₂₁NP₂)]
M_r	874.21
Crystal system, space group	Orthorhombic, Pna2₁
Temperature (K)	173
a, b, c (Å)	13.9062 (8), 12.6837 (7), 14.7938 (8)
V (Å³)	2609.4 (3)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	11.58
Crystal size (mm)	0.22 × 0.21 × 0.19

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2009)
T_min, T_max	0.189, 0.216
No. of measured, independent and observed [I > 2σ(I)] reflections	35892, 4770, 4621
R_int	0.059
(sin θ/λ)_max (Å⁻¹)	0.602

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.025, 0.063, 1.05
No. of reflections	4770
No. of parameters	298
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.76, −0.81
Absolute structure	Flack (1983), 2283 Friedel pairs
Absolute structure parameter	0.014 (8)

Computer programs: COSMO (Bruker, 2009), APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Acknowledgements

WEvZ gratefully acknowledges financial support through a UKZN Competitive Grant, and thanks Rand Refineries (South Africa) for a gift of gold salt. SVS thanks the National Research Foundation (NRF) for an Innovative Grant.

References

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