Glowiak, Tadeusz and Kozlowski, Henryk and Strinna Erre, Liliana and Micera, Giovanni (1995) Molecular structure and spectral properties of mono- and dinuclear complexes formed by manganese(II), 2,6-dimethoxybenzoate and 2,2'-bipyridine or 2-methylpyrazine. Inorganica Chimica Acta, Vol. 236 (1-2), p. 149-154. ISSN 0020-1693. Article.
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The adducts formed by reaction of [Mn(dmb)2(H2O)3]nH2O, dmb = 2,6-dimethoxybenzoato(1-), with 2,2'-bipyridine (bpy) or 2-methylpyrazine (2-Mepz) were isolated in the solid state and characterized by single crystal X-ray diffraction, IR and EPR spectroscopy, and thermogravimetry. The adduct [Mn2(dmb)4*bpy)2(H2O)2]•bpy crystallizes in the monoclinic space group P21 In, with a = 15.983(4), B = 11.048(4), C = 17.682(4) Å, β = 97.66(3)°, V = 3094.4(16) Å3, Z = 2 and Dcalc = 1.415 g cm-3. The complex exhibits a dinuclear structure where two manganese(II) atoms share two carboxylate groups adopting a rather uncommon single-atom bridging mode. The coordination at each metal nucleus is completed by a further carboxylate group, acting as a monodentate donor, a water molecule and a chelating bidentate bipyridine molecule. The crystals of the adduct [Mn(dmb)2(2-Mepz)2(H2O)2] are monoclinic, space group P21In, with a = 8.024(3), B = 10.314(3), C = 18.289(4)Å, β= 94.72(3)°, V = 1508.5(8)Å3 , Z = 2 and Dcalc = 1.412 g cm-3. The compound is mononuclear and consists of hexacoordinate ions bound to trans-pairs of monodentate carboxylates, water molecules and nitrogenous base molecules. The bpy adduct exhibits EPR spectra distinctive of magnetically coupled dimanganese(II) units.
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