Synthesis and Characterization of Platinum(II)-Terminated Dendritic Carbosilanes. X-ray Molecular Structure and Isomerization Behavior of the Model Species [PtCl(C6H3{CH2NMe2}-2-SiMe3-5)(PPh3)]

Abstract

A series of cycloplatinated carbosilane dendrimers appended with the monoanionic C, N-bidentate ligand [C{6}H{4}{CH{2}NMe{2}}-2]}-{ (CN) was prepared via a multiple C@?H activation reaction. Ligand exchange in the parent model species [PtCl(C{6}H{3}{CH{2}NMe{2}}-2-SiMe{3}-5)(DMSO)] (1) in the presence of PPh{3} gave the phosphine complex [PtCl(C{6}H{3}{CH{2}NMe{2}}-2-SiMe{3}-5)(PPh{3})] (2). The crystal structure of 2 was also determined, showing a close proximity between one of the Ar@?H of the phosphine ligand and the Ar@?H{o}{r}{t}{h}{o} of the CN ligand.