Nickel(II) and Palladium(II) Complexes with η5:κ1(N)-Coordinated Dicarbollide Ligands Containing Pendant Pyridine Group

Abstract

A series of C- and B-substituted nido-carborane derivatives with a pendant pyridyl group was prepared. The synthesized compounds were used as ligands in the complexation reactions with bis(triphenylphosphine)nickel(II) and palladium(II) chlorides to give six new metallacomplexes with unusual η⁵:κ¹(N)-coordination of the metal center. The single crystal structures of 1-(NC₅H₄-2'-S)-1,2-C₂B₁₀H₁₁, 1-(NC₅H₄-2'-CH₂S)-1,2-C₂B₁₀H₁₁, Cs [7-(NC₅H₄-2'-CH₂S)-7,8-C₂B₉H₁₁] closo- and nido-carboranes and 3-Ph₃P-3-(4(7)-NC₅H₄-2'-S)-closo-3,1,2-NiC₂B₉H₁₀ and 3-Ph₃P-3-(4(7)-NC₅H₄-2'-CH₂S)-closo-3,1,2-NiC₂B₉H₁₀ metallacarboranes were determined using single crystal X-ray diffraction.

Keywords: half-sandwich metal complexes; nickel; nido-carborane; palladium; pyridine; structure; synthesis.