SPECTRAL STUDIES ON CYCLIC CHROMOTROPIC-ACID TETRAMERS AND THEIR INTERACTION WITH METAL-IONS

With comparable molar quantities, chromotropic acid reacts with compou nds containing aldehyde groups -CHO e.g. with formadehyde or glyoxylic acid to form cyclic compounds with rings containing four chromotropic acid fragments cyclotetrachromotropylene derivatives. The cyclic comp ounds, due to the presence of a cavity in the molecule, can play the p art of host and complex smaller molecules, which has been confirmed on the basis of triethylamine by the H-1-NMR measurements. Using spectro photometric method the stability constant of 1:1 complex formed betwee n Ti(IV) and cyclic compound chromotropic acid with formaldehyde has b een determined - K = (9,0 +/- 0,1) . 10(4).