MAGNETIC STUDIES ON THE MU-OXALATO NICKEL(II) DIMERS WITH AN [NIN4O2] ENVIRONMENT - CRYSTAL STRUCTURE OF (MU-OX)[NI(323-TET)](2)(CLO4)(2)CENTER-DOT-2H(2)O (323-TET=N,N'-BIS(3-AMINOPROPYL)-1,2-ETHANEDIAMINE)

摘要

Three nickel(II) dinuclear oxalato-bridged compounds (mu-ox)[Ni(232-tet)](2)(ClO4)(2) (1), (mu-ox)[Ni(323-tet)](2)(ClO4)(2).2H(2)O (2) and (mu-ox)[Ni(333-tet)](2)(ClO4)(2).3H(2)O (3) have been characterized. 232-tet, 323-tet and 333-tet are the tetramminate ligands N,N'-bis(2-aminoethyl)-1,3-propanediamine,N,N'-bis(3-aminopropyl)-1,2-etha nediamine and N,N'-bis(aminopropyl)-1,3-propane-diamine, respectively. Complex 2 crystallizes in the monoclinic system, space group P2(1), a = 8.143(4), b = 12.019(5), c = 16.664(6) Angstrom, beta = 96.2(1), V = 1621 Angstrom(3), Z = 2, R = 0.036, R(w) = 0.040. Magnetic measurements (300-4 K), show that the three compounds are antiferromagnetically coupled, J = -32.1, -28.9 and -20.6 cm(-1) for 1, 2 and 3, respectively. [References: 17]