SYNTHESIS AND CHARACTERIZATION OF A SERIES OF MONONUCLEAR MANGANESE(IV) COMPLEXES WITH O-(SALICYLIDENEAMINOMETHYL)PHENOL AND ITS SUBSTITUTED DERIVATIVES

A series of manganese(IV) complexes, [Mn (R, R'-L)2].nS (R or R'=H, Cl , Br, CH3O; n=1/2, 1, 3/2, 2; S=H2O, THF (THF=tetrahydrofuran)) where H-2(R, R'-L) denotes o-(salicylideneaminomethyl)phenol with the substi tuent R on the salicylideneamino ring and the R' on the aminomethylphe nol ring, have been prepared and characterized by infrared and electro nic spectra, magnetic moments, cyclic voltammetry, and spectroelectroc hemical experiment. The molecular structure of [Mn (5-Cl'-L)2].2THF ha s been determined by X-ray crystallography. The ligands act as meridio nal tridentate ONO donors and the complex has an MnO4N2 coordination s phere. The spectral, magnetic, and electrochemical properties are disc ussed in relation to the molecular structure.