Notes on the Fluorescence and the Nature of the Photocoloured Form in Photochromic Azomethines

Knyazhansky, M. I.

Artykuł - szczegóły

Tytuł artykułu

Notes on the Fluorescence and the Nature of the Photocoloured Form in Photochromic Azomethines

Autorzy

Knyazhansky M. I.

Identyfikatory

Warianty tytułu

Języki publikacji

Abstrakty

The analysis of the results obtained by recent investigations of photochromic azomethines (anils), including the author's data, shows that the path way for the photo-coloured product generation proceeds consecutively via (i) the S1 excited state of the NH structure (S1 NHflu), arising from the excited state intramolecular proton transfer OH→NH and responsible for the fluorescence with the anomalous Stokes shift (ASSflu); (ii) the ASSflu quenching TICT structure (S1 state) with the twisted "keto" ring (alfa = 90°) in the trans isomer (with respect to the C-N bond, beta = 0°); (iii) the unstable trans twisted post1TICT structure (alfa = 90°, beta = 0°) in the S 0 state, which is the immediate precursor of (iv) low-stability post2TICT cis structure twisted in the S0 state (alfa = 90°, beta asymptotic to 180°). The latter is responsible for the photochromism of anils and stabilized by steric interactions and rigid media.

Słowa kluczowe

anils photochromism TICT post TICT

Wydawca

Polskie Towarzystwo Chemiczne

Czasopismo

Polish Journal of Chemistry

Rocznik

2008

Tom

Vol. 82, nr 4

Strony

795--806

Opis fizyczny

Bibliogr. 51 poz., rys.

Twórcy

autor

Knyazhansky M. I.

7865 Blue Jay Way, Zionsville, IN 46077, USA Last occupation: Professor, Head of the Laboratory of Photochemistry, The Research Institute of Physical and Organic Chemistry, Rostov State University, Russia Fax: (317)7695030, mknyaz@ya hoo.com

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-article-BUJ6-0024-0095