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Optical activity of saccharides—the vacuum-uv origin of sodium-D rotation

✍ Scribed by Eugene S. Stevens; Bangalore K. Sathyanarayana

Publisher
Wiley (John Wiley & Sons)
Year
1988
Tongue
English
Weight
423 KB
Volume
27
Category
Article
ISSN
0006-3525

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✦ Synopsis

A semiempirical theory of saccharide optical activity indicates that the dominant source of Na, rotation is a vacuum-uv CD band near 150 nm, a band observed experimentally in polysaccharide film CD spectra. The model is a modification of polarizability theory in which high-energy electronic excitations are coupled by degenerate perturbation theory, giving rise to "molecular excitons." The existence of an excitation mode well separated in energy from even higher energy modes arises from the local symmetry of tetrahedral carbon atoms in a puckered ring structure. Calculated Na, rotations correlate well with experimental values.

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Spectroscopic origin of conformation-sensitive contributions to polysaccharide optical activity: Vacuum-ultraviolet circular dichroism of agarose
✍ J. N. Liang; E. S. Stevens; E. R. Morris; D. A. Rees 📂 Article 📅 1979 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 401 KB 👁 2 views

## Abstract The vacuum‐uv CD of agarose solid films has been measured to 145 nm and shows a positive band near 180 nm and a larger negative band at around 152 nm. The positive band remains accessible in aqueous solution and has been used to characterize changes in molecular conformation and interac