Syntheses and Dyes Complexation Properties of Multiple-azo Calix[4]arene Derivatives Containing Thiourea Groups

Abstract

[4]arene derivative 7 by reacting compound 6 with salicylyl hydrazine in yield of 75%. The experiments of UV titration spectra for four tested dyes (orange I, alizarin green, victorial blue and methylene blue) showed that compounds 4～7 possessed excellent complexation abilities with 1 1 ratios for complexation and 10 5 magnitudes for the association constants. The chain-opening structure, more amino groups and more aromatic groups were favorable for the improvement of complexation abilities.