Thermally induced isomeric transformations ofbis-(diamine) complexes of nickel(II) nitrate in the solid phase |
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| Authors: | Subratanath Koner Ashutosh Ghosh Nirmalendu Ray Chaudhuri |
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| Institution: | (1) Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, 700032 Calcutta, India |
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| Abstract: | Summary Thermal reactions of Ni(diamine)2(H2O)2](NO3)2 and Ni(diamine)2(NO3)2] (where diamine=1,2-ethanediamine,N-methyl-1,2-ethanediamine,N-ethyl-1,2-ethanediamine, 1,3-propanediamine andN-methyl-1,3-propanediamine) have been investigated in the solid phase. The 1,2-ethanediamine andN-methyl-1,2-ethanediamine complexes undergo thermally induced endothermic irreversible isomeric transformations. In the 1,2-ethanediamine complex the transformation is thermochromic, whereas it is not for theN-methyl-1,2-ethanediamine complex. The transformations are explained in terms of the axial interaction of NO3 ions with nickel as well as to ligand field weakening resulting from conformational changes of the individual diamine chelate rings.Supplememtary data available: X-ray powder diffraction data (Table3). |
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