Synthesis, Structure And Studies On Property Of Coordination Complexes With 2,3-Pyrazinedicarboxylic Acid

1. Four kinds of binary complexes were synthesized with rare earth perchlorates, rare earth nitrate and 2,3-pyrazinedicarboxylic acid(2,3-H2pzdc) as ligand. Two series of six solid complexes of rare earth doped inert rare earth ions, two series of eight solid complexes of rare earth doped alkaline earth metal ions, two series of eight solid complexes of rare earth doped transition metal ions and different proportional doped solid complexes (Tb3+:Y3+) have been synthesized. Elemental analysis and ICP elemental component test deduced the complexes that have the composition of RE(pzdc)1.5·5H2O(RE3+=Eu3+,Tb3+), Tb(pzdc)(Hp zdc)o.5(N03)0.5·5H2O, Eu(pzdc)1.5·11/2H2O. The composition of complexes which doped inert rare earth ions were Tbo.5Lno.5(pzdc)1.5·5H20,Euo.5Lno.5(pzdc)1.5·5H20 (Ln3+=La3+,Y3+,Gd3+) and Tbx:Yy(pzdc)1.5·5H2O(x:y=0.10:0.90;0.20:0.80; 0.30:0.70; 0.40:0.60; 0.60:0.40; 0.70:0.30; 0.80:0.20; 0.90:0.10). The composition of complexes which doped alkaline earth metal ions were TbM(pzdc)2(Hpzdc)0.5(NO3)0.5·7H2O and EuM(pzdc)25·8H2O(M2+=Mg2+, Ca2+,Sr2+,Ba2+). The composition of complexes which doped transition metal ions were TbM(pzdc)2(Hpzdc)0.5(N03)0.5·7H20 and EuM(pzdc)2.5·8H2O(M2+=Cd2+, Co2+,Ni2+,Zn2+). The molar conductivity indicates that all the complexes are none-electrolytes; IR spectra show that the ligands coordinate with RE3+ ions through the carboxylic oxygen atoms and nitrogen atoms of 2,3-pyrazine-dicarboxylic acid. Fluorescence spectra show that the fluorescence intensity of the series Tb3+ complexes are much higher than of the Eu3+ complexes. However, Fluorescence lifetime show that the decay time of Tb3+ complexes are longer than that of the series of Eu3+ complexes. The best fluorescence intensity was studied in this article according to co-dope different inert rare earth ions, alkaline earth metal ions and transition metal ions. Y3+ doped to Tb complexes that produced intense fluorescence. When proportion of Tb3+:Y3+ is 0.7:0.3, Tb complex has the strongest intense, La3+, Gd3+, Y3+ doped to Tb,Eu complexes enhance the fluorescence intensity; alkaline earth metal ions (Mg2+, Ca2+, Sr2+ and Ba2+)doped to Tb, Eu complexes enhance the fluorescence intensity; both of transition metal ions Cd2+ and Zn2+ can enhance the fluorescence intensity of Tb, Eu complexes, Co2+ and Ni2+ have quenched the fluorescence of Tb, Eu complexes.2. The synthesis and crystal structures of a new Ba organic framework [Ba(pzdc)(H2O)] (1) and a new Ca organic framework [Ca(pzdc)(H2O)2]·H2O (2) (H2pzdc=2,3-pyrazinedicarboxylic acid) and novel 2D topology are reported, an octahedral cage structure is formed by Ba2+,O1 and O2. The structural details of the two crystals are determined by single-crystal X-ray diffraction that revealed the formation of a layered structure, they crystallize in the monoclinic system, with a=12.5877(16)A, b=9.4055(12)A, c=7.1013(9)A, for complex(1) and a=8.4241(17)A, b=16.782(4)A, c=6.9061(14)A for complex(2).3. The strong bacteriostatic effect of Eu(DBM)3dpq and Tb(DBM)3dpq have been found through the bacteriostatic activity test.