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Precisely Tuning the Coordination Modes of the 2-Methyl-1H-imidazole-4,5-dicarboxylic Acid Ligand, Affording a Series of Metal–Organic Compounds with Diverse Structures and Properties
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2019-11-07 , DOI: 10.1021/acs.cgd.9b00971
Fei Li 1, 2 , Xin Zhang 1 , Ming-Ling Sun 1 , Yayong Sun 3 , Jian Lu 2, 3 , Xin-Yi Cao 1 , Ye-Yan Qin 1 , Yuan-Gen Yao 1
Affiliation  

Five new coordination polymers, [Cd2(Hmidc)2(bpp)]·2H2O (1), [Zn3(midc)2(bpp)(H2O)2]·2H2O (2), [Me2NH2]2[Zn3(midc)2(HCOO)2] (3), [Mg(Hmidc)(H2O)2]·H2O (4), and [Co(Hmidc)(bpp)] (5) (bpp = 1,3-bis(4-pyridyl) propane, H3midc = 2-methyl-1H-imidazole-4,5-dicarboxylic acid), were synthesized. Compounds 13 feature 3D pillar-layered networks with different topologies, in which the H3midc ligand coordinantes with Zn2+/Cd2+ to form a layer and bpp or HCOO bridges the adjacent layers as a pillar. In compound 4, however, unanticipated 1D chains connect with each other through hydrogen bonds, resulting in a 3D supramolecular framework. Compound 5 displays a wavelike chain form. The UV–vis absorption spectra and the calculations of density of states demonstrate that the emission spectra of compounds 14 result from ligand-centered charge transition. The solid-state luminescence quantum yield of compound 3 reaches up to 20.69%. In addition, compound 1 has a preferable gas adsorption selectivity of CO2 over CH4 and N2 in natural gas at low pressure.

中文翻译:

精确调节2-甲基-1 H-咪唑-4,5-二羧酸配体的配位模式,以适应一系列具有不同结构和性质的金属有机化合物

五个新的配位聚合物,[Cd 2(Hmidc)2(bpp)]·2H 2 O(1),[Zn 3(midc)2(bpp)(H 2 O)2 ]·2H 2 O(2),[ Me 2 NH 2 ] 2 [Zn 3(midc)2(HCOO)2 ](3),[Mg(Hmidc)(H 2 O)2 ]·H 2 O(4)和[Co(Hmidc)(bpp) )](5)(bpp = 1,3-双(4-吡啶基)丙烷,H 3 midc = 2-甲基-1 H-咪唑(4,5-二羧酸)被合成。化合物1 - 3具有不同的拓扑结构,在将H特征3D柱状分层网络3 MIDC配体用Zn coordinantes 2+ / CD 2+以形成层和BPP或HCOO -桥接相邻层作为支柱。但是,在化合物4中,未预料到的1D链通过氢键相互连接,从而形成3D超分子框架。化合物5显示出波状链形式。紫外-可见吸收光谱和态密度的计算结果表明,化合物的发射光谱1 - 4由以配体为中心的电荷跃迁产生。化合物3的固态发光量子产率高达20.69%。另外,化合物1在低压下对天然气具有比CH 4和N 2更好的CO 2气体吸附选择性。
更新日期:2019-11-08
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