Issue 9, 2011
From the journal:

CrystEngComm

1,4-Bis(1,3-dioxo-2-indenylidene)cyclohexane: polymorphism, gas phase oxidation and enol form mediated radical formation in the solid state†

Zofia Urbanczyk-Lipkowska,*a   Przemyslaw Kalicki,a   Sylwester Gawinkowski,b   Jacek Waluk,b   Masashi Yokoyamac  and  Koichi Tanaka*c  

* Corresponding authors

a Polish Academy of Sciences, Kasprzaka 44/52, Warszawa, Poland
E-mail: ocryst@icho.edu.pl
Fax: +48 22 6326681
Tel: +48 22 3432207

b Institute of Physical Chemistry, Kasprzaka Str. 44/52, Warsaw, Poland
E-mail: waluk@ichf.edu.pl
Fax: +48 22 3433333
Tel: +48 22 3433332

c Department of Chemistry and Materials Engineering, Faculty of Chemistry, Materials and Bioengineering & High-Tech Research Centre, Kansai University, Suita, Osaka, Japan
E-mail: ktanaka@ipcku.kansai-u.ac.jp

Abstract

Crystallization of 1,4-bis(1,3-dioxo-2-indenylidene)cyclohexane from toluene and dichloromethane solutions afforded yellow photochromic and orange non-photochromic crystals, respectively. In situRaman spectroscopy of the photochromic form revealed the presence of an enol form. Both forms undergo sublimation assisted dehydrogenation under aerobic conditions.

Graphical abstract: 1,4-Bis(1,3-dioxo-2-indenylidene)cyclohexane: polymorphism, gas phase oxidation and enol form mediated radical formation in the solid state

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Article information

DOI
https://doi.org/10.1039/C0CE00509F
Article type
Paper
Submitted
08 Aug 2010
Accepted
15 Oct 2010
First published
24 Nov 2010

CrystEngComm, 2011,13, 3170-3174

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1,4-Bis(1,3-dioxo-2-indenylidene)cyclohexane: polymorphism, gas phase oxidation and enol form mediated radical formation in the solid state

Z. Urbanczyk-Lipkowska, P. Kalicki, S. Gawinkowski, J. Waluk, M. Yokoyama and K. Tanaka, CrystEngComm, 2011, 13, 3170 DOI: 10.1039/C0CE00509F

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