Studies on the spectra and antibacterial properties of rare earth dinuclear complexes with l-phenylalanine and o-phenanthroline

The complexes RE(Phe)3PhenCl3·3H2O (Phe: phenylalanine; Phen: o-phenanthroline; RE: La3+, Y3+ and Eu3+), RE0.2Eu0.8(Phe)3PhenCl3·3H2O (RE: La3+ and Y3+) were synthesized and characterized in detail. IR spectra and Raman spectra indicated that the rare earth ions are coordinated by both the oxygen atom from the COO− group and the nitrogen atom from o-phenanthroline. The RE0.2Eu0.8(Phe)3PhenCl3·3H2O also displayed co-fluorescence effect. The antibacterial activities testing showed that all these complexes exhibited excellent antibacterial ability against Escherichia coli, Staphylococcus aureus and Candida albicans.