Kinetic parameters and solid state mechanism of the thermal dehydration of trans[CrF(H2O)(aa′)2]K[Cr(CN)6]H2O And trans[CrF(H2O)(aa′)2]K[CrNO(CN)5]H2O (aa′=ethylenediamine or 1,3-diaminopropane) |
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| Authors: | M. Monfort M. Serra A. Escuer J. Ribas |
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| Affiliation: | Departament de Quimica Inorgánica, Facultat de Quimica, Universitat de Barcelona, Barcelona Spain |
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| Abstract: | The solid phase thermal deaquation of trans[CrF(H2O)(aa′)2]K[Cr(CN)6]H2O and trans[CrF(H2O)(aa′)2]K[CrNO(CN)5]H2O (aa′=ethylenediamine or 1,3-diaminopropane) has been investigated by means of TG measurements. The kinetic parameters (activation energy, Ea, activation entropy, ΔS#, and frequency factor, k0) have been determined by comparison of the isothermal and non-isothermal studies for all the principal g(α) expressions. The values found for the activation energy are low (between 80 and 110 kJ mole?1, approximately) and permit the assignment of the deaquation-anation mechanism of the SN1 type, involving square-pyramid activated complex and elimination of water as Frenkel defects. |
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| Keywords: | To whom correspondence should be addressed. |
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