کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1339651 979711 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Redox properties of hybrid Dawson type polyoxometalates disubstituted with organo-silyl or organo-phosphoryl moieties
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Redox properties of hybrid Dawson type polyoxometalates disubstituted with organo-silyl or organo-phosphoryl moieties
چکیده انگلیسی

This paper reports on the electrochemical study of Dawson-type polyoxometalates (POMs) disubstituted with phenyl-phosphonate, phenyl silyl or tertbutylsilyl moieties. The polyanions were studied by cyclic voltammetry and on rotating disk electrode in acetonitrile with tetraphenylphosphonium chloride as supporting electrolyte. We found that these hybrid polyoxometalates can accept up to five electrons and that the organic substituents modify the first and second reduction potential of the POM compared to the unsubstituted POM [P2W18O62]6−. Phenyl-phosphonate lowers the reduction potential, whereas the phenyl silyl or tertbutylsilyl moieties shift them cathodically. We also recorded by spectroelectrochemistry the spectrum of the monoreduced and the bisreduced species of the polyoxometalate disubstituted with phenyl-phosphonate.

Three Dawson-type polyoxometalates (POMs) disubstituted with phenyl-phosphonate, phenyl silyl or tertbutylsilyl moieties have been characterized by cyclic voltammetry and on glassy carbon rotating disk electrode. We found that the grafted organic substituents modify the first and second reduction potential of the POM compared to the unsubstituted POM [P2W18O62]6−. The spectrum of the monoreduced and the bisreduced species of the polyoxometalate disubstituted with phenyl-phosphonate are also reported herein.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 27, Issue 2, 6 February 2008, Pages 688–692
نویسندگان
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