Issue 6, 2009
From the journal:

New Journal of Chemistry

Thermally-induced paramagnetism of spiropyrane iodides†

Roman B. Morgunov,*a   Fedor B. Mushenok,a   Sergey M. Aldoshin,a   Natalia A. Sanina,a   Elena A. Yur’eva,a   Gennadiy V. Shilova  and  Valeriy V. Tkacheva  

* Corresponding authors

a Institute of Problems of Chemical Physics RAS, Chernogolovka, Russian Federation
E-mail: morgunov2005@yandex.ru

Abstract

Thermally stimulated paramagnetism has been found in the iodides of organic spiropyrane molecules, namely 1-isopropyl-3,3,5′,6′-tetramethylspiro(indolino-2,2′-[2H]pyrano[3,2-b]pyridinium) (SpSpSp) and spiro(1,3,3,7′-tetramethyl-indolino-2,3′-3H-pyrano[3,2-f]quinolinium) (Sp2Sp2). The activation energy of their triplet states was determined from the temperature dependence of their magnetic moments: 0.023 and 0.032 eV, respectively. It was found that the magnetic moment, μeff, increases under UV light (250–400 nm) due to the formation of high-spin (S = 3) states of the molecules.

Graphical abstract: Thermally-induced paramagnetism of spiropyrane iodides

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Article information

DOI
https://doi.org/10.1039/B822567B
Article type
Paper
Submitted
16 Dec 2008
Accepted
25 Feb 2009
First published
01 Apr 2009

New J. Chem., 2009,33, 1374-1379

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Thermally-induced paramagnetism of spiropyrane iodides

R. B. Morgunov, F. B. Mushenok, S. M. Aldoshin, N. A. Sanina, E. A. Yur’eva, G. V. Shilov and V. V. Tkachev, New J. Chem., 2009, 33, 1374 DOI: 10.1039/B822567B

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