Abstract
A study by IR, electronic and NMR (1Н and 13С) spectroscopy together with X-ray structure analysis and quantum chemical calculations using DFT B3LYP/6-31G(d,p) determined N,N´-cyclic azomethine imines — 1-(2-hydroxyphenylmethylidene)-3-oxo-5-phenylpyrazolydin-1-ium-2-yde (1) и 1-[(2-hydroxynaphthalene-1-yl)methylidene]-3-oxo-5-phenylpyrazolydin-1-ium-2-yde (2) — to exist in solutions as isomers with an intramolecular hydrogen bond between the hydroxyl group and the nitrogen of the pyrazolidone ring. Compound 1 undergoes photoexcitation in the wavelength range 363—320 nm followed by luminescence with an anomalous Stokes shift that is caused by the intramolecular excited state proton transfer mechanism (ESIPT effect).
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For Part 55 see Ref. 1.
Dedicated to Academician of the Russian Academy of Sciences V. M. Novotortsev on the occasion of his 70-th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 0648—0653, March, 2016.
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Popova, O.S., Bren’, V.A., Tkachev, V.V. et al. Benzenoid-quinoid tautomerism of azomethines and their structural analogs 56. Azomethine imines, derivatives of salicylic and 2-hydroxynaphthoic aldehydes. Russ Chem Bull 65, 648–653 (2016). https://doi.org/10.1007/s11172-016-1350-y
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DOI: https://doi.org/10.1007/s11172-016-1350-y