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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Bisimidazole-based phosphorescent thiocyanatocadmates
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Bisimidazole-based phosphorescent thiocyanatocadmates

机译:基于双咪唑的磷光硫代糖醛皂苷

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Simple room-temperature self-assemblies between Cd2+ salts, SCN- and bisimidazole molecules at pH = 2 created three new organically templated thiocyanatocadmates [H-2(L1)][Cd(SCN)(4)].H2O (L1 = 1,4-bis(1H-imidazol-1-yl)benzene) 1, [H-2(L2)][Cd(SCN)(4)] (L2 = 1,3-bis(2-methylimidazol-1-yl)propane) 2, and [H-2(L3)][Cd-2(SCN)(6)] (L3 = 1,4-bis(2-methyl-1H-imidazol-1-yl)butane) 3. X-ray single-crystal diffraction analysis reveals that (i) in 1-3, the SCN- groups doubly bridge the Cd2+ centers to form different thiocyanatocadmates: a linear chain in 1; a zigzag chain in 2; and a 2-D layer network (6(3) net) in 3; and (ii) in 1, via N-base-HNSCN interactions, the L1 molecules extend the thiocyanatocadmate chains into a 2-D supramolecular layer, whereas in 2, the zigzag thiocyanatocadmate chains self-assemble into a 3-D supramolecular network via weak SS interactions. Photoluminescence analysis indicates that the three title compounds all emit light: blue light for 1 and 2 and green light for 3. At low temperatures, the emission positions of the three compounds hardly change, but the emission intensities are largely enhanced. Interestingly, after turning off the UV lamp, 1 and 2 still briefly emit light (ca. 2 s), which means that 1 and 2 possess phosphorescence properties. Phosphorescence lifetimes at 77 K are 1619 ms for 1 and 247 ms for 2.
机译:在pH = 2的CD2 +盐,SCN-和双咪唑分子之间的简单室温自组装产生了三种新的有机模板硫氰酸透明酰胺[H-2(L1)] [CD(SCN)(4)]。H2O(L1 = 1, 4-BIS(1H-咪唑-1-基)苯)1,[H-2(L2)] [CD(SCN)(4)](L2 = 1,3-双(2-甲基咪唑-1-基)丙烷)2,[H-2(L3)] [CD-2(SCN)(6)](L3 = 1,4-双(2-甲基-1H-咪唑-1-基)丁烷)3. x -Ray单晶衍射分析显示(I)在1-3中,SCN-组倍增CD2 +中心以形成不同的硫代糖酰胺:1;一个Z字形链2;和2-D层网络(6(3)栏)3; (ii)在1中,通过N-碱基-HNSCN相互作用,L1分子将硫氰酸偶联链链延伸到2d超分子层中,而在2中,Zigzag硫代糖酰胺链通过弱替代SS互动。光致发光分析表明,三个标题化合物全部发光:1和2的蓝光和3.在低温下,三种化合物的排放位置几乎没有变化,但发射强度大大提高。有趣的是,在关闭UV灯之后,1和2仍然短暂地发光(约2秒),这意味着1和2具有磷光特性。 77 k下的磷光寿命为1和247ms的1619 ms。

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