Synthesis, structure and photophysical properties of Zn-Ln(III) (Ln=Eu, Tb) heterometallic coordination complexes

Two d-f heterometallic coordination complexes EuZn (C8H7O3)(5) (phen) (H2O) (1) and TbZn (C8H(7)O(3))(5) (phen) ( H2O), (2) were synthesized with hydrothermal reaction. These two complexes exhibit strong luminesecent emission. The crystal structures of the two complexes were determined via X-ray diffraction. The two complexes are isomorphic. Zn (II) ion is five-coordinated and Ln ( III) ion is eight-coordinated. Zn( II) and Ln( III) ions ate bridged by 4-methoxybenzoic acid ligands. The UV-Vis-NIR, IR and fluorescence spectra of the complexes were measured. The influence of coordination environment on the luminescence property and intramolecular energy transfer of complexes were discussed.