The thermodyntamics of axial coordination reaction of Cobalt(Ⅱ)(pOCH3)TPP with various ligands [L=Im(imidazole), MeIm (2-methydrimidazole), EMIm (2-ethyl-4-methylimidazole)] at different temperatures in dichlorometha...The thermodyntamics of axial coordination reaction of Cobalt(Ⅱ)(pOCH3)TPP with various ligands [L=Im(imidazole), MeIm (2-methydrimidazole), EMIm (2-ethyl-4-methylimidazole)] at different temperatures in dichloromethane solvent have been studied. The equilibrium constant (β) and stoichiometric numer (n) of reaction (1) were measured by means of Shimadzu UV-240 spectrophotometer. The changes of standard molar enthalpy △ rH and molar entropy △ S of reaction (1) were calculated. The steric and electroaic effects of the three axial ligands on the reaction were compared. The kinetic study for the talal coordination faster reaction of Cobalt(Ⅱ) (pOCH3)TPP with Im in dichloromethane at dtherent temperatures by means of a Uuion Giken RA-401 stopped-flow spectrophotometer was reported. The mechanism of reaction (1) was postulated as follows:The parameters K and k were evaluated. The △ H △ S of a pre-equllibrium step (2) and △ Hm, △ Sm of a rate-determihing step (3) were also calculated.展开更多
文摘The thermodyntamics of axial coordination reaction of Cobalt(Ⅱ)(pOCH3)TPP with various ligands [L=Im(imidazole), MeIm (2-methydrimidazole), EMIm (2-ethyl-4-methylimidazole)] at different temperatures in dichloromethane solvent have been studied. The equilibrium constant (β) and stoichiometric numer (n) of reaction (1) were measured by means of Shimadzu UV-240 spectrophotometer. The changes of standard molar enthalpy △ rH and molar entropy △ S of reaction (1) were calculated. The steric and electroaic effects of the three axial ligands on the reaction were compared. The kinetic study for the talal coordination faster reaction of Cobalt(Ⅱ) (pOCH3)TPP with Im in dichloromethane at dtherent temperatures by means of a Uuion Giken RA-401 stopped-flow spectrophotometer was reported. The mechanism of reaction (1) was postulated as follows:The parameters K and k were evaluated. The △ H △ S of a pre-equllibrium step (2) and △ Hm, △ Sm of a rate-determihing step (3) were also calculated.
