Molecular structures and solid-solid phase transitions of trinuclear CpCo[P(O)(OR)2]32M complexes

摘要: The trinuclear complexes {CpCo[P(O)(OMe)2]3}2Co and {CpCo[P(O)(OEt)2]3}2M, where M=Mg, Ca, Sr, Ba, Pb, Mn, Co, Ni, Cu, Zn, Cd or Hg, have been studied by x-ray diffraction methods the crystal structures of {CpCo[P(O)(OR)2]3}2M [R=Me with M=Co (1) R = Et M Cu (2)] solved heavy atom technique. Complex (2) crystallizes in triclinic space group P 1 two crystallographically independent molecules per unit cell. cell dimensions area 12.195(3) A,b 20.429(6) A, c 12.518(3) A,α 102.39(2)°, β=120.15(2)°, γ=92.28(2)°. molecule contains cobalt atoms one copper a linear arrangement situated on center symmetry. Each is bonded to cyclopentadienyl ring connected central three phosphonate groups acting as bridging ligands. Disorder phenomena within these are best described an enhanced thermal motion corresponding mainly rotation around Co-Cu-Co axis. CuO6 coordination octahedra exhibit small (4+2) distortion.