J. Ayllón, I. Santos, R. Henriques
Nov 13, 1998
Citations
0
Influential Citations
5
Citations
Journal
Polyhedron
Abstract
Abstract Tris(quinoxaline-2,3-dithiolato)manganese(IV) was synthesised and isolated as two different salts, (PPh4)2[MnIV(qdt)3] · 1⧹2CHCl3, 1, and (HNEt3)2[MnIV(qdt)3] · 2H2O, 2 (qdt=quinoxaline-2,3-dithiolate). The magnetic behaviour of 1 is the typical of a high spin d3 system, presenting an effective magnetic moment of 3.85 μB at room temperature. The reaction of 2 with copper(II) acetate in DMF (N,N-dimethylformamide) solution involves redox and ligand exchange processes and produces the new salt [MnII(DMF)4 (H2O)2][CuIII(qdt)2]2, 3. The crystal structure of compound 3 consists of sequences of two layers of [CuIII(qdt)2]− anions and one of [MnII(DMF)4(H2O)2]2 cations. Each cation is linked to four anions through O–H · · · N hydrogen bonds between the water ligand of the cation and one nitrogen atom of qdt ligand in the anion. Magnetic isolation of the Mn(II) centres in 3 is confirmed by magnetic susceptibility measurements.