Synthesis and characterization of platinum(II)-terminated dendritic carbosilanes: X-ray crystal structure of the model species [PtCl(C6H3{CH2NMe2}-2-SiMe3-5)(PPh3)]

A series of cycloplatinated carbosilane dendrimers appended with the monoanionic C,N-bidentate ligand [C6H4{CH2NMe2}-2]− (CN) was prepared via a multiple CH activation reaction. Ligand exchange in the parent model species [PtCl(C6H3{CH2NMe2}-2-SiMe3-5)(DMSO)] (1) in the presence of PPh3 gave the phosphine complex [PtCl(C6H3{CH2NMe2}-2-SiMe3-5)(PPh3)] (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Hortho of the CN ligand.