Influence of inductive effects and steric encumbrance on the catecholase activities of copper(II) complexes of reduced Schiff base ligands.

摘要: A series of copper(II) complexes derived from reduced Schiff base ligands has been synthesized and characterized by single-crystal X-ray diffraction spectroscopic analyses. With the exception [Cu(Ala5NO2)(H2O)] (1a), which crystallized as a mononuclear repeating unit, [Cu2L2(H2O)x(DMSO)y]·solvent (L = Ala5H (2), Ala5OMe (3a), Ala5Cl (4a), Ala5Br (5a), Gly5Br (6a), Val5Br (7a) Leu5Br (8a), x 1 or 2, y 0 1, solvent MeOH DMSO H2O) phenoxo-bridged dinuclear building units containing Cu2O2 cores. In 3a, 4a, 5a, 7a 8a, axial positions are occupied carboxylate oxygen atoms adjacent dimers, resulting in formation 1D helical coordination polymers. 6a, 2D network is constructed utilizing weak Cu⋯O interactions (∼2.7 A) with groups. All have investigated for their catecholase activities 3,5-DTBC, they show significant catalytic except 1a. The also observed to increase increasing +I effects, well steric bulkiness on α-carbon group.