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Citation: 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[J]. Acta Physico-Chimica Sinica, ;2000, 16(03): 207-213. doi: 10.3866/PKU.WHXB20000304 shu

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

1.
Department of Chemistry,Tianjin University,Tianjin 300072

Received Date: 3 June 1999
Available Online: 15 March 2000

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.
- Crystal strueture,
- Photodimerization,
- Trans-cis isomerization
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