The complex of europium with 1, 10-phenanthroline and 2-thiopheneglyoxylic acid (HL) was synthesized. Its chemical formula was determined to be [EuL2 (.) phen (.) (H(2)o)(3)]NO3 by elemental analysis, electrical conductivity, IR and H-1 NMR. It was found that the europium ion coordinated to the O atoms of 2-thiopheneglyoxylic acid and H2O, and to the N atoms of 1,10-phenanthroline. Its fluorescence property was determined by the excitation and emission spectra at room temperature, the emission peaks at 592 and 618 nm were assigned to the D-5(0)-F-7(1) and D-5(0)-F-7(2), respectively. It was also observed that the title complex emits strong red fluorescence under ultraviolet light at room temperature. In the IR spectrum, the characteristic absorptionupsilon (C-O)(1719 cm(-1)) upsilon(C-O)(1232 cm(-1)), 8(O-H)(909 cm(-1)) of 2-thiopheneglyoxylic acid disappeared in the complex, the upsilon(as) and upsilon(s) of -COO- appeared at 1642 and 1408 cm(-1) in the complex respectively. In H-1 NMR, the signals of 2-thiopheneglyoxylic acid were shifted upfield, and those of 1,10-phenanthroline downfield. It is proved by the TG curve that the complex is stable from ambient temperature to 250degreesC.
