New
complexes of Mn(II), Co(II), Ni(II) AND Cu(II) with 2,2’- OR 2,4’-bipyridine
and formates (Synthesis, thermal and other properties) |
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Authors: | D Czakis-Sulikowska J Radwańska-Doczekalska A Czylkowska M Markiewicz A Broniarczyk |
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Institution: | (1) Institute of General and Ecological Chemistry, Technical University of Lodz, Lodz, Poland |
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Abstract: | New mixed-ligand complexes with empirical
formulae: Mn(2-bpy)1.5L2·2H2O,
M(2-bpy)2L2·3H2O
(M(II)=Co, Cu), Ni(2-bpy)3L2·4H2O
and M(2,4’-bpy)2L2·2H2O
(where 2-bpy=2,2’-bipyridine, 2,4’-bpy=2,4’-bipyridine; L=HCOO– ) have been
obtained in pure solid-state. The complexes were characterized by chemical
and elemental analysis, IR and VIS spectroscopy, conductivity (in methanol
and dimethylsulfoxide). The way of metal-ligand coordination discussed. The
formate and 2,4’-bpy act as monodentate ligands and 2-bpy as chelate
ligand. The new complexes with ligand isomerism were identified. During heating
the complexes lose water molecules in one or two steps. Thermal decomposition
after dehydration is multistage and yields corresponding metal oxides as final
products. A coupled TG-MS system was used to analysis principal volatile thermal
decomposition (or fragmentation) products of Ni(2,4’-bpy)2(HCOO)2·2H2O under dynamic air or argon atmosphere. |
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Keywords: | |
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