Abstract
The conformational analysis of a 2,4-bis(4-dialkylamino-2-amido)phenyl squaraine dye revealed the presence of two rotational isomers at room temperature. Combination of spectroscopic and computational techniques showed that the rotational barrier is influenced by hydrogen bonds between the amido substituents and the oxygen atoms at the quadratic core. Even small amounts of trifluoroacetic acid interfered with the intramolecular hydrogen bond formation and accelerated the interconversion of the conformers.
Original language | English |
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Pages (from-to) | 13100-13103 |
Number of pages | 4 |
Journal | Journal of Organic Chemistry |
Volume | 86 |
Issue number | 18 |
DOIs | |
Publication status | Published - 17 Sept 2021 |
Bibliographical note
Publisher Copyright:© 2021 The Authors. Published by American Chemical Society.