Synthesis and Properties of Tetranuclear Octahalo Copper(II) Complexes, Pip4Cu4X8 (Pip = Piperidine, X = Cl or Br) and the Dimer Pip4Cu2Cl4 in Aprotic Media

Abstract

This paper reports a new family of tetranuclear Cu complexes Pip₄Cu₄X₈; Pip = piperidine, X = Cl or Br. Two electron oxidant Br₂ has been used to prepare Pip₄Cu₄Br₈ from the respective [PipCuBr]₄ complex. The dimeric complex, Pip₄Cu₂Cl₄, is also prepared by the direct reaction of anhydrous CuCl₂ with piperidine in O₂-free CH₂Cl₂. These complexes are isolated as stable solids. They are easily soluble in aprotic solvents as CH₂Cl₂ or PhNO₂. Cryoscopic measurements support tetranuclear core structure for Pip₄Cu₄X₈.