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Spectroscopic studies of the interaction of cobalt(II) N,N',N″,N‴-tetramethyltetra-3,4-pyridinoporphyrazine with amino acids and nitrogen oxides
Journal of Porphyrins and Phthalocyanines ( IF 0.9 ) Pub Date : 2002-08-25 , DOI: 10.1002/jpp.551 MAMOTHIBE A. THAMAE 1 , TEBELLO NYOKONG 1
Journal of Porphyrins and Phthalocyanines ( IF 0.9 ) Pub Date : 2002-08-25 , DOI: 10.1002/jpp.551 MAMOTHIBE A. THAMAE 1 , TEBELLO NYOKONG 1
Affiliation
The interaction of histidine, cysteine, NO and nitrite with cobalt(II) N,N',N″,N‴-tetramethyltetra-3,4-tetrapyridinoporphyrazine ([ Co II tmtppa ]4+ ) is reported. Metal-based autoreduction of [ Co II tmtppa ]4+ occurs with the formation of the [ Co I tmtppa (-2)]3+ species in the presence of histidine and cysteine. Kinetic data for the auto reduction of [ Co II tmtppa ]4+ in the presence of these amino acids gave the rate constants k f = 2.1 × 101 and 2.8 dm3 mol-1 s-1 , for cysteine and histidine, respectively. One molecule of NO or nitrite was found to coordinate to the [ Co II tmtppa ]4+ species. The equilibrium and rate constants for the coordination of the nitric oxide were K = 2.3 × 104 dm 3 mol -1 and k f = 7.5 dm 3 mol -1 s -1 , respectively. The coordination of nitrite to [ Co II tmtppa ]4+ occurred with an equilibrium constant of K = 2.0 × 102 dm 3 mol -1 and a rate constant of k f = 4.0 × 10-3 dm 3 mol -1 s -1 . There was no evidence for the coordination of two molecules of nitrite to the [ Co II tmtppa ]4+ species.
中文翻译:
钴(II) N,N',N",N‴-四甲基四-3,4-吡啶并卟啉与氨基酸和氮氧化物相互作用的光谱研究
组氨酸、半胱氨酸、NO 和亚硝酸盐与钴 (II) N,N',N",N‴-tetramethyltetra-3,4-tetrapyridinoporphyrazine ([ Co二 tmtppa]4+ ) 被报告。[ Co 的金属基自动还原二 tmtppa]4+ 随着 [ Co 的形成而发生一世 tmtppa (-2)]3+ 存在组氨酸和半胱氨酸的物种。[ Co 的自动还原动力学数据二 tmtppa]4+ 在这些氨基酸的存在下给出了速率常数 kF = 2.1 × 101 和 2.8 分米3 摩尔-1 s-1 ,分别为半胱氨酸和组氨酸。发现一分子 NO 或亚硝酸盐与 [Co二 tmtppa]4+ 物种。一氧化氮配位的平衡常数和速率常数为 K = 2.3 × 104 分米3 摩尔-1 和 kF = 7.5 分米3 摩尔-1 s-1 , 分别。亚硝酸盐与[ Co二 tmtppa]4+ 发生平衡常数 K = 2.0 × 102 分米3 摩尔-1 和 k 的速率常数F = 4.0 × 10-3 分米3 摩尔-1 s-1 . 没有证据表明两分子亚硝酸盐与[ Co二 tmtppa]4+ 物种。
更新日期:2002-08-25
中文翻译:
钴(II) N,N',N",N‴-四甲基四-3,4-吡啶并卟啉与氨基酸和氮氧化物相互作用的光谱研究
组氨酸、半胱氨酸、NO 和亚硝酸盐与钴 (II) N,N',N",N‴-tetramethyltetra-3,4-tetrapyridinoporphyrazine ([ Co