Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo ...Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato) were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at;10 nm,a characteristic Eu3+ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu（III） ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2（0.03） was two times higher than that of 1（0.01） which should be at-tributed to the effect of the ethyl substituting in ENIP.展开更多
基金Project supported by Zhejiang A & F University Science Foundation (2009FR068)the Education Department of Zhejiang Province (Y201119787)
文摘Two novel luminescent Eu（III） complexes with the formulas（NIP）Eu（DBM）3 1 and（ENIP）Eu（DBM）3 2(NIP=2-（naphtha-len-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,ENIP=1-ethyl-2-（naphthalen-1-yl）-1H-imidazo [4,5-f] [1,10] phenanthroline,DBM= dibenzoylmethanato) were successfully synthesized and characterized by IR and elemental analysis.The UV-vis absorption spectra and pho-toluminescence properties of the complexes were investigated,and the irradiation at the absorption band between 300-400 nm of europium complexes either in solution or in the solid state led to the emission of a sharp red band at;10 nm,a characteristic Eu3+ emission due to the transition of 5D0→7F2.Furthermore,the weak emission bands around 587 and 595 nm attributed to 5D0→7F0 and 5D0→7F1 transition were also displayed in the emission spectra.These results demonstrated that the Eu（III） ion was sensitized efficiently by the ligand and displayed photoluminescence with high intensity,narrow half-peak width,and monochromic light.The excited-state lifetimes of 1 and 2 were in the microsecond time scale,but the photoluminescence quantum yield of 2（0.03） was two times higher than that of 1（0.01） which should be at-tributed to the effect of the ethyl substituting in ENIP.
