cis and trans Influences in Pt(PPh3)2 Complexes Luca Rigamonti,a Michele Rusconi,a Carlo Manassero,b Mario Manassero,b Alessandra Forni,c Alessandro Pasinia a Dipartimento di Chimica Inorganica, Metallorganica e Analitica ‘L. Malatesta’, Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy. [email protected] b Dipartimento di Chimica Strutturale e Stereochimica Inorganica, Università degli Studi di Milano, Via Venezian 21, 20133 Milano, Italy. c CNR-ISTM, Via Golgi 19, 20133 Milano, Italy. The cis and the trans influences are important tools to rationalize the bond strengths in complexes. In cis/trans- [PtIIXY(PPh3)2] compounds (X and Y are anionic ligands) the variations of the Pt-P bond strengths can be related to the 1JPtP values, which depend on both the cis and trans influences of X and Y. Analysing the coupling constants of a series of cis and trans[PtIIXY(PPh3)2] compounds these influences can be rationalized and quantified.1 The structural trans and cis influences are less manifest, as shown by several crystal structures, which have been determined. A theoretical study will also be described, in order to fully comprehend these systems. 1. some already published results in: Rigamonti, L.; Manassero, C.; Rusconi, M.; Manassero, M.; Pasini, A. Dalton Trans. 2009, 12061213.