Abstract
Two new heterometallic coordination polymers [HoAg(Hbidc)2(H2O)2]n·(H2O)n (1) and [EuAg(Hbidc)2(H2O)4]n·(H2O)n (2) (H3bidc = 1H-benzimidazole-5,6-dicarboxylic acid) have been synthesized at hydrothermal conditions and characterized by elemental analysis, FT-IR, TG analysis, single-crystal X-ray diffraction and powder X-ray diffraction. Single-crystal X-ray structural analysis revealed that complex 1 possesses a 3D framework with a (3,7)-connected {3·4·5}{32·43·56·66·73·8} topological network. Complex 2 displays a 2D network with 3-connected {4.82} topology. The luminescent properties of 2 were investigated in detail and its possible use as a conversion phosphor in white light-emitting diodes was evaluated. The complex shows bright red Eu3+ emission upon excitation at 400 nm due to a low-lying charge transfer state. The thermal quenching is already significant at room temperature.
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