SYNTHESIS, CRYSTAL STRUCTURE AND ANTI-FERROMAGNETIC BEHAVIOR OF A TWO-DIMENSIONAL MANGANESE(H) COMPLEX WITH 3,6-DINITRO-1,2,4,5,-BENZENETETRA-CARBOXYLATE ANION AS BRIDGING LIGAND

摘要

A two-dimensional complex {[Mn_2(DBT)(DMF)_4] centre dot 2H_2O}_n (DBT = 3,6-dinitro-1,2,4,5- benze-netetracarboxylate anion; DMF = N,N-dimethylformamide) has been synthesized and its crystal structure determined by X-ray crystallography. The complex crystallizes in a triclinic system and the space group is P1 with a = 9.012(5), b = 9.196(6), c = 9.910(6) A. In the complex there exist two kinds of coordination environments for Mn(II) ions; each DBT coordinates four Mn(II) ions by its four carboxylate groups and in this way a two-dimensional sheet was constructed. The variable-temperature magnetic susceptibility of the complex was measured in the 5-300 K range and the magnetic data indicate that the magnetic interaction between the bridged manganese(II) ions displays an anti-ferromagnetic coupling.