Abstract
The binaphthyl macrocyclic ligand, N,N '-diethyl-[3,3 '-(2,2 '-dihydroxy-1,1 '-binaphthyl)carboxamide]-2,2 '-dihydroxy-1,1 '-binaphthyl-3,3 '-dicarboxylic acid (DDCDB), has been synthesized and investigated. The ligand (DDCDB) and its metal complexes involving Cu-II, Zn-II, UO2II, Th-IV, Ce-III, Mo-VI and W-VI ions have been prepared and characterized by spectral (i.r., u.v.-vis.), elemental analyses, magnetic moments and thermal analyses measurements. DDCDB behaves as a tridentate ligand towards Cu-II, Zn-II and UO2II ions coordinating via CO, NH and the deprotonated naphthyl OH groups in a ratio of 2:1 (M:L). On the other hand, DDCDB behaves in a bidentate manner coordinatingvia the NH and the deprotonated naphthyl OH groups only in case of the Th-IV, Ce-III, Mo-VI, and W-IV ions and in ratio 1:1 (M:L). Results of thermal measurements confirm the existence of solvent molecules inside and outside the coordination sphere. Th-VI complex has been applied for the hydrolysis of phosphodiester and the results show a significant rate enhancement of similar to 5.8 million fold with respect to the auto-hydrolysis of bis-(p-nitrophenyl) phosphate (BNPP) under the same conditions Also, Cu-II complex accelerates the photodegradation of the hazardous pollutant (acid green dye) in the presence of hydrogen peroxide by degrading 90% of the dye within 23 min.