A series of [Na2MnII2MnIII6] clusters derived from trigonal bipyramidal [NaMnIIMnIII3] subunits bridged by mono-, di- and tri-fold azide groups: synthesis, crystal structures and magnetic properties

• DOI: 10.1016/j.poly.2018.12.007
• Publication Date: 2018-12-17T22:05:53Z
• Authors: Jiang Liu; Quanling Suo; Jian Song; Lijuan Zhang; Yuanyuan Gao
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract A series of [Na2MnII2MnIII6] clusters derived from trigonal bipyramidal [NaMnIIMnIII3] subunits bridged by mono-, di- and tri- fold azide groups Na[Na2MnII2MnIII6(μ3-O)2(HL1)6(μ1,3-N3)(HCOO)8(H2O)2](ClO4)2 (1), [Na2MnII2MnIII6(μ3-O)2(L2)6(μ1,1-N3)4(μ1,3-N3)2(N3)2(CH3OH)2] (2) and [Na2MnII2MnIII6(μ3-O)2(L3)6(μ1,1-N3)7(N3)2(H2O)2] (3) have been obtained via the self-assembly of different potentially multidentate Schiff base ligands and auxiliary ligands (azide ions and formate ions) with divalent manganese salt in an air-exposed water-methanol solution. The structures of 1, 2 and 3 were characterized by elemental analysis, FT-IR spectroscopy and single-crystal X-ray diffraction analysis. Crystal structures reveal that all the three similar interesting decanuclear clusters [Na2MnII2MnIII6] are derived from double trigonal bipyramid subunits bridged by mono-, di- and tri- fold azide groups, respectively. The magnetic susceptibility studies of 1, 2 and 3 in the temperature range 2–300 K shows that predominantly antiferromagnetic interactions between the manganese centers.