The transformations of parallel and perpendicular L2M(µ-acetylene)ML2 complexes

Abstract

Acetylenes bond to two ML₂(M = Pt or Ni) fragments in parallel and perpendicular geometries. The electronic structures of these complexes are analyzed using qualitative molecular-orbital theory. With each mode of acetylene co-ordination there is required a different co-ordination geometry at the metal. Various transformations between L₂M (µ-acetylene) ML₂ isomers, known and unknown, are discussed and related by the isolobal analogy to common organic transits. Based upon the isolobal analogy and the calculated electronic structures, several as yet unknown complexes are proposed to be stable.