SYNTHESIS, PROPERTIES, AND CRYSTAL-STRUCTURES OF A SERIES OF DINUCLEAR MANGANESE(III) COMPLEXES WITH 1,5-BIS(SALICYLIDENEAMINO)-3-PENTANOL AND VARIOUS ANIONS - FORMATION OF A TETRANUCLEAR MANGANESE(III) COMPLEX

Mu-Alkoxo-bridged dinuclear and tetranuclear manganese(III) complexes with 1,5-bis(salicylideneamino)-3-pentanol (H3L), [Mn2(L)(CH3O)Cl2(CH3OH)2] (1), [Mn2(L)(CH3O)(CH3COO)(CH3OH)2]X(X=Br (2), I (3)), [Mn2(L)(CH3O)(CH3COO)(CH3OH)Y](Y=NCS (4), N3 (5), ClO4 (6)), [Mn2(L)(CH3O)(NCO)2(H2O)2] (7), and [Mn4(L)2(O)2(CH3COO)2].4H2O.2CH3OH (8) have been prepared and characterized by infrared and electronic spectra, magnetic susceptibilities, and cyclic voltammetry. The molecular structures of 1-5, 7, and 8 were determined by the single-crystal X-ray structure analyses. All the complexes except for 8 have a similar structure, where Cl-, CH3COO-, N3-, NCS-, CH3OH, or H2O is incorporated into the fifth or sixth coordination site on the Mn2(L)(CH3O) plane. The structure of 8, is a tetramer consisting of two Mn2(L)(O)(CH3COO) dimeric units held together through the oxo ions and the phenoxo-oxygen atoms of L. The spectral and magnetic properties were discussed in relation to the crystal structures.