Thermal analysis study of 5,10,15,20-tetrakis (methoxyphenyl) porphyrins and their nickel complexes |
| |
Authors: | Xiuhua Wei Xiuhong Du Donghua Chen Zhangping Chen |
| |
Affiliation: | aHubei Key Laboratory for Catalysis and Material Science, College of Chemistry and Material Science, South-Central University for Nationalities, Wuhan 430074, Hubei, PR China bCollege of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, Hubei, PR China |
| |
Abstract: | The thermal stability in air of 5,10,15,20-tetrakis (4-methoxyphenyl) porphyrin (4-TMPP), 5,10,15,20-tetrakis (3-methoxyphenyl) porphyrin (3-TMPP), and their nickel metallo-complexes (4-TMPP-Ni and 3-TMPP-Ni) has been investigated by thermogravimetry (TG). 4-TMPP and 4-TMPP-Ni exhibit higher thermal stability compared to 3-TMPP and 3-TMPP-Ni. Nickel complexes exhibit a little higher thermal stability than the corresponding porphyrins. The thermal behavior including melting temperature and enthalpy of fusion was determined by differential scanning calorimetry (DSC) and infrared spectra (IR). The activation energies of thermal decompositions of 4-TMPP-Ni and 3-TMPP-Ni were obtained by integral model-free method; the mechanism functions and pre-exponential factors were determined by master plots method. The kinetic models follow the same mechanism function, Avramie-Erofeev equations with integral forms g() = [−ln (l − )]0.278 and g() = [−ln (l − )]0.260, respectively. |
| |
Keywords: | Porphyrin Nickel complexes Infrared spectra Thermal analysis |
本文献已被 ScienceDirect 等数据库收录! |
|