Stability of metalloporphyrins adsorbed on clays: a comparative study
Stability of metalloporphyrins adsorbed on clays: a comparative study
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粘土吸附金属卟啉的稳定性：比较研究
DOI：
10.1016/0016-7037(82)90226-5
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发表时间：
1982
影响因子：
5
通讯作者：
H. Damme
中科院分区：
文献类型：
--
作者：
F. Bergaya;H. Damme
对中四苯基卟啉的钒-、镍-、钴-、铁(III)-、锰(III)-、锌-、铜-和镁配合物在氯仿介质中与粘土（蒙脱土、钙长石、高岭石）接触时的脱金属稳定性进行了评价。结果表明，除金属过程可以用一系列涉及1的平衡来描述。(1)金属形态在粘土表面的吸附。（ii）配合物的脱金属和游离碱的形成。（iii）游离碱解吸到溶液中，或其质子化成由粘土保留的阳离子。钒基卟啉和镍卟啉是与粘土接触时最稳定的配合物，而镁卟啉在这种环境下特别不稳定。这些模型显示了金属卟啉在粘土环境中的相对稳定性，可能与卟啉地球化学的最终理解有关。
The stability towards demetallation of vanadyl-, nickel-, cobalt-, iron(III)-, manganese (III)-, zinc-, copper-, and magnesium complexes of meso-tetraphenylporphyrin in contact with clays (montmorillonite, hectorite, kaolinite) in chloroformic medium has been estimated. It is shown that the demetallation process can be described by a sequence of equilibria involving1.(i) the adsorption of the metallated form on the clay surface2.(ii) the demetallation of the complex and formation of the free base3.(iii) either the desorption of the free base into the solution, or its protonation to the dication which is retained by the clay.The vanadyl and nickel porphyrins were found to be among the most stable complexes in contact with clays, whereas the magnesium porphyrin was particularly unstable in this environment. These models showing the relative stabilities of the metalloporphyrins in the clay environment may be relevant to the eventual understanding of porphyrin geochemistry.