NEW ANTIFERROMAGNETIC DINUCLEAR COMPLEXES OF MANGANESE(II) WITH 1,8-NAPHTHALATO AS BRIDGING LIGAND - SYNTHESIS, SPECTRUM AND MAGNETISM

Three manganese(II) binuclear complexes have been synthesized, namely [Mn-2(NAPH)(L)(4)(CIO4)(2), L is bpy (2,2'-bipyridyl), phen (1,10-phen anthroline) or NO2-phen (5-nitro-1,10-phenanthroline), NAPH denotes th e 1,8-naphthalate dianion. Based on IRI elemental analyses and conduct ivity measurement, these complexes are proposed to have extended NAPH- bridged structures and consist of two manganese(II) in a distorted oct ahedron environment. The temperature dependence of magnetic susceptibi lities of manganese(II) complexes have been studied, giving the exchan ge integral J -0.36 cm(-1) (bpy); J = -0.49 cm(-1) (phen), respectivel y. These results indicate a weak antiferromagnetic coupling between th e paramagnetic ions in the complexes.