Photocatalytic Activities of Polyoxometalates (POMs) In Water Oxidation and Decarboxylative C-C Cross Coupling

Misra, Archismita (2015) Photocatalytic Activities of Polyoxometalates (POMs) In Water Oxidation and Decarboxylative C-C Cross Coupling. Masters thesis, Indian Institute of Science Education and Research Kolkata.

PDF (MS dissertation of Archismita Misra (10MS41)) Archismita_Misra-10MS41.pdf - Submitted Version Restricted to Repository staff only Download (1MB)

Abstract

Polyoxometalates (POMs) are polyatomic species, usually charged or neutral, consisting of atleast three or more transition metal clusters linked together by shared oxygen atoms forming discrete species. In the current work, we have studied the photocatalytic behaviour of polyoxometalates, focussing on water oxidation and decarboxylative C-C cross coupling. Water oxidation by molecular catalysts is a very important area of research and in the first study, we have effectively enhanced the oxygen evolution rate by immobilising the molecular POM on platforms of graphene oxide sheets which function as electron acceptor templates. The second study is on the photochemical decarboxylative C-C cross coupling. Most of the reported decarboxylative coupling reactions are thermal. We wanted to design a novel photochemical decarboxylative cross coupling method with a single molecular catalyst exploiting photochemistry of POMs as sensitizers at room temperature and we observe effective C-C coupling of two organic moieties, which is reported in this thesis.

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