SPECTROSCOPIC STUDY OF TRICARBOXYCELLULOS E SALTS WITH Y3+, BA2+, ANDCU2+ CATIONS

Spectroscopic study of salt formation in preliminary oxidized viscose fiber has shown, that the complex salt of tricarboxycellulose with ytt rium, copper, and barium ions contains ionized and non-ionized carboxy metal groups. The absorption band 1681 cm-1 in IR spectrum of the comp lex salt of tricarboxycellulose is due to stretching C=O vibrations in carboxymetal groups. The fact, that band position depends on the type of metal cation, can be employed for analytic purposes. In viscose fi ber, oxidized to tricarboxycellulose, the interaction between carboxyl groups and yttrium, copper, and barium cations is much stronger at C2 and C3, than at C6 atoms. Absorption bands 854 and 779 cm-1 in IR spe ctrum of viscose fiber, oxidized to tricarboxycellulose, testify, that pyranose ring breaks upon oxidation of secondary hydroxyl groups at C 2 and C3.