Laser induced optoacoustic spectroscopy of benzil: Evaluation of structural volume change upon photoisomerization
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- 作者：Alok Chakrabarty ; Pradipta Purkayastha ; Nitin Chattopadhyay
- 关键词：Laser induced optoacoustic spectroscopy ; Photoacoustic calorimetry ; Benzil ; Photoisomerization ; Structural volume change
- 刊名：Journal of Photochemistry and Photobiology A: Chemistry
- 出版年：2008
- 出版时间：15 August 2008
- 年：2008
- 卷：198
- 期：2-3
- 页码：256-261
- 全文大小：427 K
文摘
The cis-skew to trans-planar photoisomerization of benzil in the photoexcited state was studied by laser-induced optoacoustic spectroscopy (LIOAS) in a series of normal alkane solvents at room temperature. The structural volume change due to the photoisomerization process has been estimated and compared with the same calculated from the optimized skew and trans structures. The magnitude of the structural volume change is estimated to be 22.9 ± 1.2 mL/mol. This study reveals that an expansion in volume occurs during the photoinduced isomerization process. In non-polar alkane solvents, the estimated volume change has been argued to be free from electrostrictional contribution.