title: Measuring the optical chirality of molecular aggregates at liquid-liquid interfaces.
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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. watarai@chem.sci.osaka-u.ac.jp
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Watarai
authors.forename: Kenta
authors.initials: K
authors.lastname: Adachi
mesh_terms: D007211:Indoles / Q000032:analysis*; D054833:Isoindoles; D055095:Optics and Photonics; D011166:Porphyrins / Q000032:analysis*; D013057:Spectrum Analysis; D013499:Surface Properties
chemical_list: D007211:Indoles; D054833:Isoindoles; D011166:Porphyrins; C013647:phthalocyanine