Structural studies of mixed-ligands copper(II) and copper(I) complexes with the rigid nitrogen ligand: bis[N-(2,6-diisopropylphenyl)imino]acenaphthene

摘要

The crystal structure of the rigid bidentate nitrogen ligand bis[N-(2,6-diisopropylphenyl)imino]acenaphtene (abbr. o,o'-iPr(2)C(6)H(3)-BIAN) and three mixed- ligand copper complexes, namely [Cu-II(AcOH)(o,o'-iPr(2)C(6)H(3)-BIAN)Cl-2] (1), [Cu-II(acac)(AcOH)(o,o'-iPr(2)C(6)H(3)-BIAN)].(ClO4) (2) (where AcOH = acetic acid and acac = acetylacetonate) and [(CuBr)-Br-I(o,o'-iPr(2)-p-BrC6H2-BIAN)](2) (3) are reported. In complexes 1 and 2, the coordination around the copper(II) centre is distorted square pyramidal with acetic acid molecule in the apical position. Two imine nitrogen atoms of o,o'-iPr(2)C(6)H(3)-BIAN are occupying the basal plane together with two chloride atoms in case of 1 and two oxygen atoms (from acac ligand) in case of 2. In complex 3 the copper(I) ion is tetrahedrally surrounded by two imine nitrogen atoms of o,o'-iPr(2)-p-BrC6H2-BIAN, and by two bridging bromide atoms. Complex formation is followed by certain structural changes inside the rigid N-N ligand. Such changes led to an increased planarity of the o,o'-Pr2C6H3-BIAN backbone, and produced a nearly perpendicular angle between the naphthalene and the aromatic imine planes. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 35]