Synthesis, Structure, Luminescence And Detection Of Rare Earth Complexes Of Tetrafluoroterephthalic Acid

Two series of 2,3,5,6-tetrafluoroterephthalic acid(H2tfbdc)lanthanide coordination polymers with different structures,namely,{[Ln(tfbdc)1.5(H2O)]·2H2O}n[Ln = Pr(1)and Nd(2)]and {[Ln(TFBDC)1.5(H2O)2]·H2O}n(Ln = Ce(3);Pr 4,Nd 5,Sm 6,Eu 7,Gd 8,Tb 9,Dy 10,Ho 11,Er 12,Yb 13 and Lu 14),have been synthesized by facile reactions of H2tfbdc with LnCl3·6H2O and proton agents.Also,one serie of 2,3,5,6-tetrafluoroterephthalic acid(H2tfbdc)and 4,4,4-Trifluoro-l-phenylbutane-3-dione(Hbta)lanthanide coordination polymers with different structures,namely,{[Ln2(tfbdc)(bta)4(CH3OH)x]·y(CH3OH)}n(Ln = Pr 17,x = 4,y = 1;Nd 18,x = 4,y = 1;Sm 19,x = 4,y = 1;Eu 20,x = 4,y = 1;Tb 21,x = 2,y = 0;Dy 22,x = 2,y = 0;Ho 23,x = 2,y = 0;Er 24,x = 2,y = 0;Yb 25,x = 2,y = 0),have been synthesized by facile reactions of H2tfbdc and Hbta with LnCl3·6H2O and proton agents under ambient temperature.X-ray diffraction reveals that complexes 17-25 show one-dimensional chain structures,complxes 3-14 show two-dimensional layer work structures and complxes 1 and 2 show three-dimensional net work structures.Further,a two-component lanthanide complex {[Dy0.281Eu0.719(TFBDC)1.5(H2O)2]·H2O}n(15)and one three-component lanthanide complex {[Gd0.871Eu0.1033Tb0.026(TFBDC)1.5(H2O)2]·H2O}n(16)have been synthesized through the doping of lanthanide ions.All complexes have been characterized by ememental adnlysis,IR,UV,PXRD,TG-DSC.The luminescent spectra for single-lanthanide complexes reveal that complexes 1,2,4,5,11-13,17,18 and 25 exhibit Near-infrared emission of Pr3+ ions,Nd3+ ions,Ho3+ ions,Er3+ ions and Yb3+ ions,complex 8 display the intense ligand-centered blue emission;complexes 7,20 and 9,11 respectively present characteristics of the red and green light emitting,complex 6 shows single-component white light.The luminescent spectra for lanthanide-mixed complexes suggest that complex 15 along with the increase of excitation wavelength from orange light,white light changes to blue-green light,complex 16 along with the increase of excitation wavelength from blue-green light,white light changes to orange light;and they all got high purity of white light emission.Based on organic small molecule luminescent tests,complexes 9,21 and 25 in visible and NIR region exhibits the high sensitivity and selectivity of the luminescent response to benzaldehyde.