Synthesis and spectroscopic characterization of fluorescent solid rareearth complexes with hydroxamic acids

The complexes RE2(DHYA)3.nH2O in the title bar were synthesized through some reactions of trivalent rareearth ions.In the process of synthesis,dihydroxam,ic acids were taken as ligands while the alcohol was taken as a solvent.The ligands included adipylhydroxamic acid(ADHA),p-phthalichydroxamic acid(PPHA),oxalohydroxamic acid (OXHA),butadihydroxamic acid(BDHA),o-phthalichydroxamic acid(OPHA),benzoylhydroxamic acid(BHA),etc.Measured at 25℃,the molar conductances in various modes are 13.00-21.05 S.cm^2.mol^-1,which shows that rare-earth complexes are nonelectrolytes and the hydroxamino groups of the complexes have taken part in bonding.Infrared spectra,ultraviolet spectra,nuclear magnetic resonance(1HNMR) spectra,and fluorescence spectra were used to investigate the complexes,Experiments have proved that the complexes of Eu^3+ and Tb^3+ with aromatic hydroxamic acids have good fluorescent characteristics.