| 光谱学与光谱分析 |
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| The Influence of Pyridyl-Carboxylic Acid Intermolecular H-Bond on Photoisomerization and Photochemical Stabilities |
| WU Ying1,ZHOU Hong-wei2,BU Feng-quan3,TIAN Yan-qing2,JIANG Shi-mei1* |
1. State Key Laboratory for Supramolecular Structure and Materials,Jilin University,Changchun 130012,China
2. College of Chemistry,Jilin University,Changchun 130012,China
3. Department of Analytical Biochemistry,Institute of Frontier Medical Sciences,Jilin University,Changchun 130012,China |
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Abstract A new type of liquid crystalline was formed through self-assembly via intermolecular hydrogen bonding between the carboxylic acid and the pyridyl group of the stilbazoles. Cholesteryl butane diacid single ester (CSA) was synthesized for use as H-bond donor and the stilbazole derivatives (NCn) were prepared as H-bond acceptors. The spectroscopic behavior and the photochemical stabilities of these two compounds,NCn and its intermolecular H-bonding complex CSA·NCn were investigated by UV-Vis spectroscopy. The results show that these two compounds easily undergo photoisomerization from trans to cis isomers in alcohol. In chloroform solution,the CSA·NCn only undergoes trans-cis photoisomerization,while NCn exhibits not only trans-cis isomerization but also a special photoreaction. The reason is that in CSA·NCn compounds,the pyridyl N-end group is forms intermolecular H-bonding with CSA,and can’t catch the H+ and the radical. It is proved that this intermolecular H-bond was very stable when being exposed to UV light.
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Received: 2006-11-12
Accepted: 2007-02-12
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Corresponding Authors:
JIANG Shi-mei
E-mail: smjiang@jlu.edu.cn
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