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Thiolactim-Thiolactam photoisomerisation: Sulfur as proton donor for excited state proton transfer process
S C MAKHAL, A BHATTACHARYYA,
Published in Elsevier B.V.
2019
Volume: 717
   
Pages: 112 - 118
Abstract
Photophysical properties of 1-(2’-Hydroxy-5’-Chlorophenyl)-3-thio-5-oxo-1H-imidazo-[3,4-b] isoindol (HCHT) have been investigated thoroughly. Steady state and time resolved absorption and emission measurements in combination with theoretical calculation reveal that the synthesized molecule HCHT shows excited state thiolactim-thiolactum tautomerism through intramolecular hydrogen bonding between donor sulphur atom (-S-H) and acceptor nitrogen (N) atom. This is by far the first example where a sulfur atom is present as donor in an excited state proton transfer (ESIPT) process. Choice of sulfur atom in HCHT decelerates the irreversible ESIPT process compared to its oxygen atom donor analogue as evidence from excited state lifetime experiments. © 2019 Elsevier B.V.
About the journal
JournalData powered by TypesetChemical Physics Letters
PublisherData powered by TypesetElsevier B.V.
ISSN0009-2614
Open AccessNo