Original scientific paper

Schiff Base Complexes of Copper(II)

Antony F. Marinovich ; Department of Chemistry, The University of Auckland, Private Bag 92 019, Auckland, New Zealand
R. Shane O’Mahony ; Department of Chemistry, The University of Auckland, Private Bag 92 019, Auckland, New Zealand
Joyce M. Waters ; Chemistry, Institute of Fundamental Sciences, Massey University, Private Bag 102 904, North Shore Mail Centre, Auckland, New Zealand
T. Neil M. Waters ; Chemistry, Institute of Fundamental Sciences, Massey University, Private Bag 102 904, North Shore Mail Centre, Auckland, New Zealand

Abstract

The crystal structures of four Schiff base molecules are presented, one of which is a re-appraisal of a previously reported structure. Crystals of N,N'-1,2-phenylene-bis(salicylideneiminato)copper(II) have been grown from both chloroform and pyridine. The structure from chloroform shows two crystallographically distinct squareplanar molecules per asymmetric unit in an orthorhombic cell, a = 20.159(2), b = 14.918(1), c = 13.329(1) Å; space group Pna21. Two different stereochemistries are observed when pyridine is the solvent. One has square planar geometry and the other square pyramidal with a pyridine molecule bound in the fifth co-ordination site. The space group is P1 with a = 8.748(4), b = 14.499(4), c = 18.725(5) Å, α = 109.93(3), β = 91.99(2), γ = 101.64(3)°. Bis(N-phenyl pyridoxylideneiminato)copper(II) crystallises in a monoclinic cell, space group P21/c, a = 5.7037(6), b = 20.394(1), c = 10.6321(6) Å, β = 101.443(6)° with the trans square planar co-ordination geometry. In the re-appraised structure of aqua(5-phosphopyridoxylidene-DLphenylalanineato) copper(II) the complex is square pyramidal with two oxygen and one nitrogen donor from the ligand. The fourth site is occupied by a water molecule and the fifth, apical donor is a phosphate oxygen from an adjacent molecule. The space group is triclinic P1 with a = 8.697(2), b = 13.039(3), c = 12.418(3) Å, α = 110.49(2), β = 108.61(2), γ = 63.65(10)°.

Keywords

copper(II) complexes; Schiff base complexes; salicylideneiminato complexes; pyridoxal

Hrčak ID:

132265

URI

https://hrcak.srce.hr/132265

Publication date:

1.9.1999.

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