A. Sunil, S. J. Rao
Feb 17, 2015
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Journal
IOP Conference Series: Materials Science and Engineering
Abstract
1-(2-Hydroxyphenyl)thiourea is a fluorogenic compound and it undergoes a very slow autooxidation to form an yellow coloured disulphide, 1-hydroxy-2-[({[N-(2- hydroxyphenyl) carbamimidoyl]disulfanyl} carbonoimidoyl) amino] benzene. In the presence of chromium(VI) ions, the rate of formation of the disulphide increases which results in the quenching of fluorescence. This analytical property has been utilized for chromium(VI) determination. The emission studies were recorded at λEx=416nm and λEm=520nm respectively. The influence of analytical properties, role of surfactants and activators are reported. Fluorescence quenching studies have been experimentally verified using Stern-Volmer plots.