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Acta Physico-Chimica Sinica  2000, Vol. 16 Issue (03): 207-213    DOI: 10.3866/PKU.WHXB20000304
Article     
Crystal Structure and Photochemical Properties of r-1,c-2,t-3,t-4-1,3-bis(4-biphenyl)-2,4-di(4-pyridyl)cyclobutane
Zhang Wen-Qin, Zhang Zhi-Ming, Zheng Yan, Wang Shu-Li, Zhao Shu-Na
Department of Chemistry,Tianjin University,Tianjin 300072
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Abstract  

r-1,c-2, t-3, t-4-1,3-bis(4-biphenyl)-2,4-di(4-pyridyl)cyclobutane (II) was obtained in diluted sulfuric acid by photodimerization reaction. Its structure was determined by X-ray diffraction method. The crystal is monoclinic, space group is P21/n,with a=1.0038(2), b=1.8995(4), c=1.4647(3)nm, β=98.82(3)°, Z=4. The cyclobutane ring of II has puckered conformation. It was found that under short wave UV light II is easy to be photolyzed to reproduce its monomer trans-1-(4-biphenyl)-2-(4-pyridyl)ethene (E-I),and then the new formed E-I transforms to its cis-isomer(Z-I) through trans-cis isomerization. Finally, the equilibrium of isomerization establishes between E-I and Z-I. Photolysis of II or E-I will form the same isomerization mixture.



Key wordsCrystal strueture      Photodimerization      Trans-cis isomerization     
Received: 03 June 1999      Published: 15 March 2000
Corresponding Authors: Zhang Wen-Qin   
Cite this article:

Zhang Wen-Qin, Zhang Zhi-Ming, Zheng Yan, Wang Shu-Li, Zhao Shu-Na. Crystal Structure and Photochemical Properties of r-1,c-2,t-3,t-4-1,3-bis(4-biphenyl)-2,4-di(4-pyridyl)cyclobutane. Acta Physico-Chimica Sinica, 2000, 16(03): 207-213.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20000304     OR     http://www.whxb.pku.edu.cn/Y2000/V16/I03/207

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