Synthesis, characterization and crystal structures of some four coordinated nickel(II) complexes with tridentate Schiff base ligands
摘要:
A number of Ni(II) complexes with tridentate Schiff base ligands with a N2O donor set and coordinating NNN- and SCN- anions have been synthesized and characterized by analytical, spectroscopic and electrochemical techniques. X-ray structure analyses of three of these complexes [(LNi)-Ni-1(NNN)] (1), [(LNi)-Ni-2(NNN)] (2) and [(LNi)-Ni-3(NCS)] (6) [HL1 = Me2NCH2CH2N(Me)C6H4OH, HL2 = Et2NCH2CH2N(H)C6H4OH, HL3 = Et2NCH2CH2N(H)C6H3BrOH] show that the nickel atom has a square planar geometry. Thermogravimetric studies show multiple step decomposition, and electrochemical studies indicate that the complexes are irreversibly oxidized to Ni(III) species, which are unstable and undergo rapid decomposition. (C) 2001 Elsevier Science B.V. All rights reserved.