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摘要
A supramolecular Cd(II) complex[Cd(bpdc) (phen)(2) (H2O)] center dot 6H(2)O (1) was synthesized with 2,4 '-biphenyldicarboxylic acid (H(2)bpdc) and 1,10-phenanthroline (phen) under hydrothermal conditions and characterized by single-crystal X-ray diffraction elemental analysis, and IR spectrum. Single-crystal X-ray analysis reveals complex 1 crystalizes in the triclinic P space group, the metal center Cd(II) ion is six-coordinated and exhibits a distorted octahedron geometry arrangement. 3D supramolecular structure could be formed taking into account two kinds of hydrogen bonds and pi-pi interactions. At the same time, we discussed the luminescent properties of complex 1 in the solid-state as well as in the solvents at different temperatures. When excited at 350 nm, in the solid state at 298 K, 1 has purple luminescence with emission band at 390 nm; in the solid state at 77 K, 1 displays two emission bands at 380 and 520 nm. Because the vibration structure is more defined at low temperature, at 298 K, 1 also has purple luminescence in DMSO and CH3OH solutions with emission bands at 380 and 375 nm, which are blue shifted compared with solid-state maximum emission band. These all can be attribute to the n*,-7t transition based on the coordinate ligands. The fluorescence decay curves of complex 1 indicate that the processes of decay consist of two components. At 298 K, the lifetime of 1 is longer in DMSO solution (tau(1) =1. 73 mu s and tau(2) =14. 07 mu s) than that in CH3OH solution (tau(1) = 21 mu s and tau(2) =12. 44 mu s). Moreover, the lifetime of 1 is longer at 77K (tau(1) =1. 96 mu s and tau(2)= 16.11 mu s) than that at 298 K in the solid state (tau(1) 1.20 mu s and tau(2)=11. 34 mu s). The results might be caused by the increase in radiative rate and decrease in non-radiative rate at low temperature.
- 出版日期2015-1
- 单位哈尔滨工业大学
