New silica-gel-bound polyazacycloalkanes and characterization of their copper(II) complexes using electron spin resonance spectroscopy

Abstract

Several tetraazamacrocycle-bonded silica gels have been synthesized and characterized. 1,4,7,10-Tetraazacyclododecane, 1,4,8,11-tetraazacyclotetradecane and 1,5,9,13-tetraazacyclohexadecane have been covalently bound to silica gel and their respective copper(II) complexes characterized. Three different methods were used for capacity determinations: quantitative ESR measurements of copper(II) complexes, nitrogen, carbon and copper elemental analysis and UV/VIS measurements.