Kinetics and Mechanism for the Formation and Dissociation Reactions of 21-(4-Nitrobenzyl)-5,10,15,20-tetrakis(4-sulfonatophenyl)-23H-porphyrinatozinc(II) and -cadmium(II)
Kinetics and Mechanism for the Formation and Dissociation Reactions of 21-(4-Nitrobenzyl)-5,10,15,20-tetrakis(4-sulfonatophenyl)-23H-porphyrinatozinc(II) and -cadmium(II)
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21-(4-硝基苯甲基)-5,10,15,20-四(4-磺基苯基)-23H-卟啉锌(II)和-镉(II)的形成和解离反应的动力学和机理
DOI:
10.1246/bcsj.70.1353
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发表时间:
1997
影响因子:
4
通讯作者:
H. Ishimi
中科院分区:
文献类型:
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作者:
M. Tabata;H. Ishimi
The incorporation reaction of zinc(II) and cadmium(II) into 21-(4-nitrobenzyl)-5,10,15,20-tetrakis(4-sulfonatophenyl)-23H-porphyrin (NO2Bz(Htpps)4−; HP4−) and the dissociation reaction of the metalloporphyrins ([MP]3−) have been studied spectrophotometrically at I = 0.1 mol dm−3 (NaNO3). The formation rate of the metalloporphyrins is expressed by the following equation: d[MP3−]/dt = kfM[M2+][HP4−]+kfMOH[MOH+][HP4−]-kdMP[MP3−][H+]. The rate constants and the activation parameters of the reaction were found to be kfZn = (4.86 ± 0.06) × 102 mol−1 dm3 s−1 (25 °C), ΔH‡ = 62.1 ± 1.6 kJ mol−1, and ΔS‡ = 14.8 ± 5.3 J mol−1 K−1; kfZnOH = (6.39 ± 0.14) × 103 mol−1 dm3 s−1 (25 °C), ΔH‡ = 22.8 ± 0.9 kJ mol−1, and ΔS‡ = −90.2 ± 3.1 J mol−1 K−1; kdZnP = 122.3 ± 2.3 mol−1 dm3 s−1 (25 °C), ΔH‡ = 19.8 ± 2.2kJ mol−1, and ΔS‡ = −139 ± 18 J mol−1 K−1 for zinc(II) and kfCd = (1.17 ± 0.02) × 105 mol−1 dm3 s−1 (25 °C), ΔH‡ = 42.5 ± 1.3 kJ mol−1, and ΔS‡ = −5.3 ± 4.2 J mol−1 K−1; kdCdP = (2.51 ± 0.04) × 107 mol−1 dm3 s−1 (25 °C)...
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