Abstract
Some new experimental methods for measuring the optical chirality of molecular aggregates formed at liquid–liquid interfaces have been reviewed. Chirality measurements of interfacial aggregates are highly important not only in analytical spectroscopy but also in biochemistry and surface nanochemistry. Among these methods, a centrifugal liquid membrane method was shown to be a highly versatile method for measuring the optical chirality of the liquid–liquid interface when used in combination with a commercially available circular dichroism (CD) spectropolarimeter, provided that the interfacial aggregate exhibited a large molar absorptivity. Therefore, porphyrin and phthalocyanine were used as chromophoric probes of the chirality of itself or guest molecules at the interface. A microscopic CD method was also demonstrated for the measurement of a small region of a film or a sheet sample. In addition, second-harmonic generation and Raman scattering methods were reviewed as promising methods for detecting interfacial optical molecules and measuring bond distortions of chiral molecules, respectively.
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Acknowledgements
This study was financially supported by a Grant-in-Aid for Scientific Research (S) (No. 16105002) and was also supported in part by the Global COE program of Osaka University and the “Yuragi project” of the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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Watarai, H., Adachi, K. Measuring the optical chirality of molecular aggregates at liquid–liquid interfaces. Anal Bioanal Chem 395, 1033–1046 (2009). https://doi.org/10.1007/s00216-009-3012-5
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DOI: https://doi.org/10.1007/s00216-009-3012-5