Journal of Organometallic Chemistry, 474 (1994) 217-221 217 Square planar platinum( II) complexes. Crystal structures of cis-bis( triphenylphosphine) hydro( triphenylstannyl)platinum( II) and cis-bis( triphenylphosphine) hydro( triphenylsilyl)platinum( II) Latifah Abdol Latif ‘, Colin Eaborn and Alan P. Pidcock School of Molecular Sciences, Universi@ of Sussex, Brigh!on BNl 9QJ (UK) Ng Seik Weng Institute of Advanced Studies, University of Malaya, 59100 Kuala Lumpur (M alay sia) (Received September 27, 1993) zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Abstract The complexes cis-[PtH6nPh,)(PPh,)2], crs-[PtH(Sn(C,H,Me-p),)(PPh,),l, cis-[PtH(Sn(C,H,Me-p),XDIOP)], and cis- [PtH(SiPh,XPPh,),] have been prepared, and the crystal structures of cis-[PtH(SnPh,XPPh,),] and cis-[PtH6iPh,XPPh,)21 have been determined. Both of these complexes exhibit distorted square-planar geometry at platinum. In the tin complex, the Pt-P bonds are almost equal in length, but in the silicon complex, the Pt-P bond trans to silicon is significantly longer than that cis to silicon, in accord with the larger trans influence of silyl ligands. Key words: Platinum; Tin; Silicon; Crystal structure 1. Introduction We describe below the preparation of three new complexes, cis-[PtH(SnPh,XPPh,),], cis-[PtH{Sn(C, H,Me-p),)(PPh,),], cis-[PtH{Sn(C,H,Me-p)J(DIOP)I and the results of an X-ray diffraction study of the first of these. The structure of the corresponding silicon- containing compound, cis-[PtH(SiPh,XPPh,),l has also been determined for comparison. A search of the Cam- bridge Crystallographic Data Base has revealed only one other compound containing a triarylstannyl- platinum bond, and that is a trans-species, viz. truns- H-NSnPh,XPCy,),l Ill. 2. Experimental details 2.1. Synthesis of triarylstannyl-platinum (ZZ)complexes The [Pt(C,H,XPPh,),l complex was prepared by the standard procedure [2] and [ p-(MeC,H,),SnH] by Correspondence to: Dr. L.A. Latif. ’ Present address: Centre of Foundation Studies in Science, Univer- sity of Malaya, 59100 Kuala Lumpur, Malaysia. 0022-328X/94/$7.00 SSDI 0022-328)3(93)24290-L the method used for the synthesis of (C,H,),SnH [3]. Other reagents were purchased from commercial sources. Manipulations were carried out under nitro- gen by standard vacuum and Schlenk techniques. 2.1.1. cis-[PtH(SnPh,)(PPh,),j Equimolar amounts of [Pt(C,H,XPPh,)J and Ph,SnH were dissolved in cu. 10 ml of ether. When evolution of ethylene had ceased, the pale yellow solid was filtered off and recrystallized from dichlorometh- ane-ether mixture to afford the pure product (0.9 g, 60%), m.p. 147-149°C. (Found: C, 62.2; H, 5.0. Calc. for C,,H,,P,SnPt: C, 60.6; H, 4.3%). IR (KBr): 2040 cm-’ (Pt-H). ‘H NMR (90 MHz, CDCl,) at -30°C: -3.16 [2 doublets, 2J(31P’-Pt-1 H) 154.1 Hz, 2J(31P”- Pt-’ H) 15.5 Hz, 1J(195Pt-1 H) 767.2 Hz] ppm relative to Me,Si. 31P-(1H} (32.4 MHz, CDCl,) at -30°C): 8(P’) - 109.8 [1J(195Pt-31 P) 2621.9 Hz, 2J(119Sn-Pt-31 P) 137.5 Hz, 2J(117Sn-Pt-3’ P) 131.5 Hz)], a(P”) - 107.7 [1J(195Pt-31P) 2613.3 Hz, 2J(1’9Sn-Pt-31 P) 1687.1 Hz, 2J(117Sn-Pt-31 P) 1612.3 Hz, 2J(31P-Pt-31 P) 8.6 Hz] ppm relative to P(OMe), (P’ refers to the phosphorus truns to H and P” to that cis to H). 119Sn-{1H) NMR 0 1994 - Elsevier Science S.A. All rights reserved