Crystal and molecular structure of mono-α-picolinecopper(II) chloroacetate

Abstract

The crystal structure of mono-α-picolinecopper(II) chloroacetate has been determined by X-ray diffraction methods; refinement has been carried out by a full-matrix least-squares procedure with three-dimensional counter data. The crystals are triclinic, space group P, with a= 7·881 ± 0·015, b= 8·913 ± 0·009, c= 10·995 ± 0·019 Å, α= 115° 53′± 5′, β= 87° 7′± 5′, γ= 87° 42′± 6′, and Z= 1. The copper atoms are bridged in pairs by four chloroacetate groups to form binuclear molecules, [Cu(ClCH₂O·CO₂)₂(Me·C₅H₄N)]₂. The copper atom lies 0·26 Å from the plane of the four oxygen atoms (Cu–O 1·975 Å) to which it is bonded, towards the nitrogen atom of the α-picoline ligand. The distorted octahedral environment around the copper atom is completed by the nitrogen atom of the α-picoline ligand (Cu–N 2·161 Å) and by the second copper atom (Cu⋯Cu 2·747 Å). The binuclear molecule as a whole possesses a centre of symmetry.