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首页> 外文期刊>Electroanalysis >Cobalt porphyrin immobilized on a niobium(V) oxide grafted-silica gel surface: Study of the catalytic oxidation of hydrazine
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Cobalt porphyrin immobilized on a niobium(V) oxide grafted-silica gel surface: Study of the catalytic oxidation of hydrazine

机译：卟啉钴固定在氧化铌（V）接枝硅胶表面上：肼催化氧化的研究

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摘要

meso-Tetracarboxyphenylporphyrin (4,4',4",4"'(21H-23H-Porphine-5,10,15,20-tetrayl) tetrakis-(benzoic acid)), designated as H2TCPP, was efficiently immobilized onto niobium oxide grafted on the silica get surface, SiO2/Nb2O5, by the -COO-Nb bond formed between the porphyrin carboxyl groups and Nb2O5. This immobilized porphyrin, SiO2/Nb2O5/H2TCPP, was then in situ metallated with Co(II) in dimethylformamide solution. The metallation process was followed by inspection of the UV-vis spectra which showed a decrease in the number of Q bands (a(2u) --> e(g) transition) after the metallation, indicating that the symmetry of the porphyrin ring changed from D-2h to D-4h upon incorporation of Co(II). This material, when incorporated into a carbon paste electrode, electrocatalyzed hydrazine oxidation. Amperometric studies showed the potential of the modified electrode as a sensor for determination of hydrazine. The response time of the modified electrode was less than 1 s. A linear response was obtained between 1 X 10(-5) and 5 x 10(-4) mol L-1 at pH 7. [References: 41]
机译：将内消旋四羧基苯基卟啉（4,4'，4“，4”'（21H-23H-Porphine-5,10,15,20-四基）四-（苯甲酸），称为H2TCPP，有效地固定在氧化铌通过在卟啉羧基和Nb2O5之间形成的-COO-Nb键，将接枝到二氧化硅上的表面变成SiO2 / Nb2O5。然后将这种固定化的卟啉SiO2 / Nb2O5 / H2TCPP用二甲基甲酰胺溶液中的Co（II）原位金属化。金属化过程后，检查紫外可见光谱，该光谱显示出金属化后Q带的数量减少（a（2u）-> e（g）跃迁），表明卟啉环的对称性发生了变化加入Co（II）后从D-2h到D-4h。将该材料掺入碳糊电极中时，会发生电催化的肼氧化反应。安培研究表明，修饰电极可作为测定肼的传感器。修饰电极的响应时间小于1 s。在pH值为7的情况下，线性响应在1 X 10（-5）和5 x 10（-4）mol L-1之间获得。[参考文献：41]

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