Synthesis, fluorescence, and sorption properties of cobalt coordination polymers of the N,N′-bis(4-pyridylmethyl)naphthalene diimide ligand
作者:Guo-Bi Li、Zhi-Hui Liao、Rong-Kai Pan、Jun-Min Liu、Sheng-Gui Liu、Zhong Zhang
DOI:10.1007/s11243-015-9963-9
日期:2015.9
Three cobalt coordination polymers, namely [Co(4-pmntd)2(CF3SO3)(H2O)]·(CF3SO3)·(C2H5OH)·0.5(HCCl3)·H2O} n (1), [Co(4-pmntd)(H2O)4]·(NO3)2·H2O} n (2), and [Co(4-pmntd)(pta)(CH3OH)2]·2(CHCl3)} n (3) (4-pmntd = N,N′-bis(4-pyridylmethyl)-naphthalene diimide; pta = terephthalate), have been synthesized by reactions of 4-pmntd with Co(CF3SO3)2·4H2O, Co(NO3)2·6H2O, and Co(pta), respectively. The complexes have been characterized by elemental analyses, powder X-ray diffraction, thermogravimetric analyses, IR spectroscopy, and single-crystal X-ray diffraction. In complex 1, the ligand adopts U-mode, resulting in a dumbbell-like 2D (4, 4)-sql net structure in a non-interpenetrating edge-to-edge arrangement. The Z-mode ligand arrangement leads to 1D zigzag chains for complex 2, and a 2D twofold interpenetrating bat-like (4, 4)-sql net for complex 3. A solution of complex 2 in DMF showed a change in color and remarkably enhanced fluorescence upon the addition of two equivalents of acetate, whereas other anions did not induce a color change. Hence, complex 2 can act as a highly promising acetate-detecting reagent. Their thermal and the gas adsorption properties of complexes 1 and 3 were investigated. Three 1D and 2D cobalt coordination polymers have been synthesized; their structural diversity in these complexes is attributed to different coordination abilities, geometries of counter-anions, and the different conformations adopted by the ligand. A solution of complex 2 showed a change in color and remarkably enhanced fluorescence upon the addition of two equivalents of acetate, whereas other anions did not induce a color change. Hence complex 2 can act as a highly promising acetate-detecting reagent. Their thermal properties and the gas adsorption property of complexes 1, 3 were investigated.
三种钴配位聚合物,即[Co(4-pmntd)2(CF3SO3)(H2O)]·(CF3SO3)·(C2H5OH)·0.5(HCCl3)·H2O} n (1)、[Co(4-pmntd) )(H2O)4]·(NO3)2·H2O} n (2) 和 [Co(4-pmntd)(pta)(CH3OH)2]·2(CHCl3)} n (3) (4-pmntd) = N,N'-双(4-吡啶甲基)-萘二酰亚胺;pta = 对苯二甲酸酯),通过 4-pmntd 与 Co(CF3SO3)2·4H2O、Co(NO3)2·6H2O 和 Co( pta) 分别。通过元素分析、粉末 X 射线衍射、热重分析、红外光谱和单晶 X 射线衍射对配合物进行了表征。在配合物1中,配体采用U型,形成非互穿边对边排列的哑铃状2D (4, 4)-sql网络结构。 Z 模式配体排列导致复合物 2 形成 1D 之字形链,以及复合物 3 形成 2D 双重互穿蝙蝠状 (4, 4)-sql 网络。复合物 2 在 DMF 中的溶液显示出颜色变化并显着增强添加两当量的乙酸盐后会发出荧光,而其他阴离子不会引起颜色变化。因此,复合物 2 可以作为一种非常有前途的乙酸盐检测试剂。研究了配合物1和3的热性能和气体吸附性能。合成了三种一维和二维钴配位聚合物;这些配合物的结构多样性归因于不同的配位能力、抗衡阴离子的几何形状以及配体采用的不同构象。添加两当量的乙酸盐后,复合物 2 的溶液显示出颜色变化并显着增强荧光,而其他阴离子则不会引起颜色变化。因此,复合物 2 可以作为一种非常有前途的乙酸盐检测试剂。研究了配合物1、3的热性能和气体吸附性能。