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Issue 5, 1998
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Perfluoroalkane photodefluorination via mercury photosensitization: experimental and theoretical aspects

Abstract

Mercury photosensitization in the presence of NH3 leads to partial defluorination and functionalization of a variety of perfluoroalkanes to give perfluoroalkyl imines, amines and nitriles. Poly(tetrafluoroethylene) (PTFE) can be surface-functionalized to give a robust hydrophilic surface by this method. Theoretical studies with DFT-B3LYP geometries and PCI-80 energies suggest the [Hg*(NH3)2] excited state complex may be involved as a key reactive intermediate. These studies show that while pure F-atom abstraction by the H atom is very slow, the highly reducing exciplex can give a net F-atom abstraction by a concerted electron transfer/fluoride ion back-transfer pathway, which has a very much lower activation barrier. Subsequent formation of perfluoroalkene is thought to be followed by nucleophilic attack by ammonia, which initiates an ammonia addition/HF elimination sequence leading to the final products.

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Article type: Paper
DOI: 10.1039/A709195H
New J. Chem., 1998,22, 503-510

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    Perfluoroalkane photodefluorination via mercury photosensitization: experimental and theoretical aspects

    J. Burdeniuc, P. E. M. Siegbahn and R. H. Crabtree, New J. Chem., 1998, 22, 503
    DOI: 10.1039/A709195H

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