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http://dx.doi.org/10.5012/jkcs.2004.48.3.261

Determining the Dynamic Sequence of Carbonyl Groups in a Rod-Coil Liquid Crystalline Oligomer Using Two-Dimensional Raman Correlation Spectroscopy  

Jung, Kab-Sang (Department of Chemistry, Kunsan National University)
Yu, Soo-Chang (Department of Chemistry, Kunsan National University)
Han Yu, Keon-Ok (Department of Chemistry, Kunsan National University)
Publication Information
Journal of the Korean Chemical Society / v.48, no.3, 2004 , pp. 261-265 More about this Journal
Abstract
We investigated the order of local movement of functional groups (-C(=O)O) in a liquid crystalline (LC) oligomer (12-4) using 2D Raman correlation spectroscopy. The results suggest that the free carbonyl near the ethyl terminal group moved first, followed by the hydrogen-bonded group. The free carbonyl group between the biphenyl groups rarely moved. Interestingly, 2D sample-to-sample correlation spectroscopy (2D STSCS) revealed that some of the carbonyl modes started to move at far below (50$^{\circ}C$) the LC temperature (135$^{\circ}C$), countering conventional beliefs.
Keywords
2D Raman Correlation Spectroscopy; Liquid Crystalline Oligomer; Dynamics; Carbonyl Group;
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Times Cited By KSCI : 1  (Citation Analysis)
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