Issue 42, 2018

Proton transfer triggered proton transfer: a self-assisted twin excited state intramolecular proton transfer

Abstract

The double excited state intramolecular proton transfer (ESIPT) of 3,5-bis(2-hydroxyphenyl)-1H-1,2,4-triazole (bis-HPTA), a molecule possessing two intramolecular hydrogen bonded donor–acceptor pairs, has been investigated. The molecule undergoes not only a single ESIPT, but also a rare twin ESIPT. The most interesting fact is that initially, only one acid–base pair is ESIPT active and the other pair is ESIPT inactive. The first proton transfer triggers the proton transfer in the second acid–base pair by creating appropriate conditions. This new type of sequential proton transfer is labeled as ‘proton transfer triggered proton transfer’ (PTTPT). The PTTPT has been demonstrated by steady state and time resolved fluorescence techniques. It was further substantiated by theoretical data and using a chemically modified system 3-(2-hydroxyphenyl)-5-(2-methoxyphenyl)-1H-1,2,4-triazole.

Graphical abstract: Proton transfer triggered proton transfer: a self-assisted twin excited state intramolecular proton transfer

Supplementary files

Article information

Article type
Paper
Submitted
16 Jun 2018
Accepted
24 Sep 2018
First published
24 Sep 2018

Phys. Chem. Chem. Phys., 2018,20, 27131-27139

Proton transfer triggered proton transfer: a self-assisted twin excited state intramolecular proton transfer

S. Sahu, M. Das, A. K. Bharti and G. Krishnamoorthy, Phys. Chem. Chem. Phys., 2018, 20, 27131 DOI: 10.1039/C8CP03835J

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