620170-33-4Relevant academic research and scientific papers
Platination of [3-X-7,8-Ph2-7,8-nido-C2 B9H8]2- (X=Et, F)Synthesis and characterisation of slipped and 1,2→1,7 isomerised products
Robertson, Susan,Ellis, David,Rosair, Georgina M.,Welch, Alan J.
, p. 286 - 293 (2007/10/03)
The reaction of the labelled carborane ligand [3-Et-7, 8-Ph2-7,8- nido -C2B9H8] 2- with a source of {Pt(PMe2Ph)2} 2+ affords non-isomerised 1,2-Ph2-3, 3-(PMe2Ph) 2-6-Et-3,1,2-closo-PtC2 B9H8 (1). The analogous reaction between [3-F-7, 8-Ph2-7,8- nido -C2B9H8] 2- and {Pt(PMe2Ph)2}2+ yields 1,8-Ph2-2,2-(PMe2Ph)2-4-F-2,1, 8- closo -PtC2B9H8 (3). Compound 1 has a heavily slipped structure (Δ 0.72 A?), which to some degree obviates the need for C atom isomerisation. However, that it is a kinetic product of the reaction is evident from the fact that it reverts to isomerised 1,8-Ph2-2,2-(PMe2Ph) 2-4-Et-2,1,8-closo-PtC2B9H8 (2) slowly at room temperature but more rapidly with gentle warming. The heteroatom and labelled-B atom positions in the isomerised compounds 2 and 3 may be explained most simply by the rotation of a CB2 face of an intermediate based on the structure of 1. Compounds 1-3 were characterised by a combination of spectroscopic and crystallographic techniques.
