Bis[μ-1,3-bis(diphenylphosphanyl)propane-κ2 P:P′]digold(I) tetrachloridonickelate(II) diethyl ether monosolvate

The title compound, [Au2(C27H26P2)2][NiCl4]·C4H10O, consists of a digold(I) complex cation, an [NiCl4]2− complex anion and a diethyl ether solvent molecule. Two 1,3-bis(diphenylphosphanyl)propane (dppp) ligands bridge two AuI atoms, forming a metallacycle in which each of the AuI atoms is coordinated in a slightly distorted linear environment by two P atoms. In the complex anion, the NiII atom is coordinated by four chloride ligands in a distorted tetrahedral geometry. The complex cation and the complex anion form a cation–anion pair through two Au⋯Cl contacts of 3.040 (1) and 3.021 (2) Å. One of the phenyl groups of the dppp ligand is disordered over two positions with equal occupancies.

The title compound, [Au 2 (C 27 H 26 P 2 ) 2 ][NiCl 4 ]ÁC 4 H 10 O, consists of a digold(I) complex cation, an [NiCl 4 ] 2À complex anion and a diethyl ether solvent molecule. Two 1,3-bis(diphenylphosphanyl)propane (dppp) ligands bridge two Au I atoms, forming a metallacycle in which each of the Au I atoms is coordinated in a slightly distorted linear environment by two P atoms. In the complex anion, the Ni II atom is coordinated by four chloride ligands in a distorted tetrahedral geometry. The complex cation and the complex anion form a cation-anion pair through two AuÁ Á ÁCl contacts of 3.040 (1) and 3.021 (2) Å . One of the phenyl groups of the dppp ligand is disordered over two positions with equal occupancies.
Recently, we started to investigate the creation of diphosphine-bridged digold(I) metalloligands and their coordination behavior toward various metal ions, with the aim of the rational construction of heterometallic multinuclear and metallosupramolecular structures Igashira-Kamiyama et al., 2012;Hashimoto et al., 2010). In the course of this study, we found the formation of a diphosphine-bridged digold(I) complex, [Au 2 (dppp) 2 ] 2+ (dppp = 1,3-bis- Here, we report the synthesis and crystal structure of (I).
In the complex-cation of (I), two Au I atoms and four P atoms are deviated from co-planarity, with the dihedral angle between two Au 2 P 2 planes being 21.94 (2)°. This structural feature is different from those found in complex-cation are located nearly on the same plane (Gruber et al., 2010;Brandys et al., 2001 (3.040 (1) Å and 3.021 (2) Å), while any other significant intermolecular interactions do not exist in (I) (Fig. 2).

Experimental
To a  U iso (H) = 1.2U eq (C). One phenyl ring is disordered over two positions (C7-C12 and C13-C18) with site occupancies of 0.5. The FLAT and SIMU restraints were used to model the disordered phenyl ring.

Bis[µ-1,3-bis(diphenylphosphanyl)propane-κ 2 P:P′]digold(I) tetrachloridonickelate(II) diethyl ether monosolvate
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 F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.