Bis(triphenylphosphanylidene)iminium dichloridotriphenylstannate(IV)

The structure of the title compound, [Ph3P=N=PPh3]+[Ph3SnCl2]− or (C36H30NP2)[Sn(C6H5)3Cl2], obtained as a by product of the reaction between Ph3SnCl and [Ph3P=N=PPh3]+·HSeO3 −, consists of discrete essentially isolated ions. Both the cation and the anion lie on twofold axes which pass through the central N atom in the cation and through the SnIV atom in the anion. In the crystal, the ions interact only through a weak interaction between the Cl atom of the anion and an H atom of a phenyl ring of the cation.

The structure of the title compound, [Ph 3 P=N=PPh 3 ] + -[Ph 3 SnCl 2 ] À or (C 36 H 30 NP 2 )[Sn(C 6 H 5 ) 3 Cl 2 ], obtained as a by product of the reaction between Ph 3 SnCl and [Ph 3 P N PPh 3 ] + ÁHSeO 3 À , consists of discrete essentially isolated ions. Both the cation and the anion lie on twofold axes which pass through the central N atom in the cation and through the Sn IV atom in the anion. In the crystal, the ions interact only through a weak interaction between the Cl atom of the anion and an H atom of a phenyl ring of the cation.

Experimental
Crystal data (C 36  Financial support from the PRIN 2008-Molecular Clusters in Nanoscience and the University of Parma, Italy, is gratefully acknowledged.

Comment
The title compound was isolated from a dichloromethane solution as a by product of the reaction between of Ph 3 SnCl  (Ng, 1995(Ng, ,1999Harrison et al., 1978;Nayek et al., 2010) reported in the CSD: The mean values are 2.590 (2) Å and 176.6 (7)°, respectively. The mean planes of the phenyl rings form dihedral angles of 59.70 (2)° and 38.78 (2)° with the SnC 3 mean plane.
In the crystal there is a weak interaction between the chlorine atom of the dichlorotriphenylstannate anion and a hydrogen atom of a phenyl ring of the bis(triphenylphosphine)iminium cation (Table 1).

Experimental
A dichloromethane solution of equimolar amounts of triphenyl-tin chloride and bis(triphenylphosphine)iminium hydrogenselenite was stirred at room temperature for 1 h. The solution was then cooled slowly to 278 K. Crystals suitable for X-ray analysis were obtained from the solution in two days.

Refinement
The C-bound H-atoms were included in calculated positions and treated as riding atoms: C-H = 0.93 Å for CH(aromatic), with U iso (H) = 1.2U eq (parent C-atom).

Special details
Geometry. All e.s. 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 Rfactors(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.