Thermoanalytical studies of imidazole-substituted coordination compounds |
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Authors: | Email author" target="_blank">S?MaterazziEmail author S?Vecchio L?W?Wo S?De?Angelis Curtis |
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Institution: | (1) Department of Chemistry, Sapienza University of Rome, P.le A. Moro, 5, 00185 Rome, Italy;(2) Department S.B.A.I, Sapienza University of Rome, Via del Castro Laurenziano 7, 00161 Rome, Italy;(3) Department of Chemistry, Illinois State University, Normal, IL, USA |
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Abstract: | Four manganese(II) coordination compounds with bis(1-methylimidazol-2-yl)ketone (BIK) of general formula Mn(BIK)2X2 (X = Cl, Br, NO3, ClO4) were synthesized and characterized by elemental analysis, by UV–vis, and FTIR spectroscopies to be compared with the literature
data. Following our previous thermoanalytical studies on imidazole-substituted coordination compounds, the thermal behavior
of the synthesized Mn(II) complexes was investigated using TG and DTG techniques: the thermal profile is characterized by
three substantial consecutive releasing steps for all the three complexes and the releasing supposed behavior is confirmed
by EGA analysis performed by coupling the TG analyzer to an MS spectrometer. In particular, the first step is ascribed to
the release of the two anions, followed by the loss of four methyl groups (side chains of the ligand) and two bridge-carbonyl
groups. The residual tetra-imidazole manganese compound decomposes in a final step to give MnO as the final residue. Both
the initial decomposition temperatures and the kinetic rate constants associated to the first decomposition step indicated
a higher stability of the Mn(BIK)2Cl2 complex, the bromide complex being very close to the chloride one (first-step thermal stability: ClO4
− <NO3
− ≤Br− <Cl−). Finally, the three-dimensional diffusion reaction model (D3) was selected to describe the first decomposition step for
all the four complexes examined. |
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Keywords: | |
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