Molecular connectivity: Treatment of the electronic structure of amino acids
β Scribed by Lionello Pogliani
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 246 KB
- Volume
- 81
- Category
- Article
- ISSN
- 0022-3549
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π SIMILAR VOLUMES
Dipiperidinosquaraine (9) crystallizes in the orthorhombic system, space group Pnab, with four molecules in a cell of dimensions a = 7.1798( 9), b = 9.5362(8), and c = 18.788(2) A. The molecule is located over a center of symmetry, so the four-membered ring (C -C = 1.456(1) A av) is exactly planar;
The electronic absorption spectra of the position isomers nicotinamide and isonicotinamide, nicotinic acid, and isonicotinic acid were investigated, together with the spectra of thionicotinamide, N-methyl nicotinamide and nicotinic acid N oxide. Apparent differences in the spectra of the position is