Copper(II) coordination compounds: Classification and analysis of crystallographic and structural data V. Polymeric compounds

This review classifies almost 600 polymeric Cu(II) compounds. The various g eometries are found in increasing number in the order: four- (mostly square -planar)much less than five- (mostly square-pyramidal)<<< six-coordinate (m ostly tetragonal-bipyramidal). The most common ligands are oxygen and nitro gen atoms. The ligands range from mono- to undecadentate. In most examples, apical positions are occupied by oxygen-donor ligands. In general, the mea n Cu-L(equatorial) bond length is shorter than the respective Cu-L(apical) bond length. The shortest Cu-Cu distance in the series of four-coordinate d erivatives is 2.95 Angstrom, five-coordinate 2.652(2) Angstrom and six-cood inate 2.977(2) Angstrom. Several relationships between the various structur al parameters were found and are discussed.