首页> 美国卫生研究院文献>ACS Omega >Series of Cadmium(II) Coordination Polymers Basedon a Versatile Multi-N-Donor Tecton or Mixed Carboxylate Ligands:Synthesis Structure and Selectively Sensing Property
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Series of Cadmium(II) Coordination Polymers Basedon a Versatile Multi-N-Donor Tecton or Mixed Carboxylate Ligands:Synthesis Structure and Selectively Sensing Property

机译:镉(II)配位聚合物系列在多功能的多N受体Tecton或羧酸盐配体上混合:合成结构和选择性传感特性

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摘要

Five Cd(II) metal–organic frameworks (MOFs), [Cd(HL)2] (>1), [Cd(HL)2(H2O)2] (>2), [Cd3(HL)2(obda)2] (>3), [Cd2(HL)2(ohmbda)(DMA)(H2O)] (>4), and [Cd2(HL)(btc)(H2O)2]·3H2O (>5), were prepared by reactions of Cd(NO3)2·4H2O with 1-(1H-imidazol-4-yl)-4-(4H-tetrazol-5-yl)benzene (H2L) or mixed carboxylate ancillary ligands of 1,2-benzenedicarboxylic acid (H2obda), 5-hydroxy-1,3-benzenedicarboxylic acid (H2ohmbda), and 1,3,5-benzenetricarboxylic acid (H3btc), respectively. Their structures have been characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy (IR), thermogravimetric analysis, and powder X-ray diffraction. Compounds >1 and >2 are supramolecular isomeric frameworks without consideration of the solvent molecules. Complex >1 exhibits a binodal (3, 5)-connected two-dimensional (2D) layer structure with the point (Schläfli) symbol of (52·6)(55·64·7), while complex >2 shows a 2D + 2D → 3D (three-dimensional) framework. Complex >3 is a (3, 5, 6)-connected tetranodal 3D net with the point (Schläfli) symbol of (4·82)2(45·6·84)2(45·65)2(48·66·8). Compound >4 is a (3, 3, 8)-connected trinodal 3D net with the point (Schläfli) symbol based on a binuclear [Cd2N2O] subunit, while >5 is a 2-nodal (3, 4)-connected 2D V2O5-type network based on [Cd2N2(COO)2] SBU. The studies of molecular sensing properties show that the luminescentMOFs can be employed as fluorescent sensors for the detection of Fe3+ and nitro compounds. Compound >1 and >3 exhibit quenching responses for Fe3+ in dimethylformamidesolution with detection limits of 2.3 × 10–6 and 8.6 × 10–7 M, respectively. Meanwhile,compound >5 can sense 4-nitrophenol with a detection limitas low as 5.75 × 10–7 M.
机译:五个Cd(II)金属有机框架(MOF),[Cd(HL)2](> 1 ),[Cd(HL)2(H2O)2](> 2 >),[Cd3(HL)2(obda)2](> 3 ),[Cd2(HL)2(ohmbda)(DMA)(H2O)](> 4 )和[Cd2(HL)(btc)(H2O)2]·3H2O(> 5 ),是通过Cd(NO3)2·4H 2 O反应制备的与1-(1H-咪唑-4-基)-4-(4H-四唑-5-基)苯(H 2 L)或1,2-苯二甲酸的混合羧酸酯辅助配体( H 2 obda),5-羟基-1,3-苯二甲酸(H 2 ohmbda)和1,3,5-苯三羧酸(H 3 btc)。它们的结构已通过单晶X射线衍射,元素分析,红外光谱(IR),热重分析和粉末X射线衍射进行了表征。化合物> 1 和> 2 是超分子异构构架,无需考虑溶剂分子。复数> 1 展示了一个具有双斜线(3,5)连接的二维(2D)层结构,其点(Schläfli)符号为(5 2 ·6)(5 5 ·6 4 ·7),而复杂的> 2 显示2D + 2D→3D(三维)框架。复杂> 3 是连接(3、5、6)的四节点3D网络,其点(Schläfli)符号为(4·8 2 2 (4 5 ·6·8 4 2 (4 5 ·6 5 < / sup>) 2 (4 8 ·6 6 ·8)。化合物> 4 是连接(3、3、8)的三节点3D网络,其点基于双核[Cd 2 N 2 < / sub> O]亚单元,而> 5 是2节点(3、4)连接的2D V 2 O 5 型网络基于[Cd 2 N 2 (COO) 2 ] SBU。分子感应特性的研究表明,发光MOF可用作荧光传感器,用于检测Fe 3 + 和硝基化合物。化合物> 1 和> 3 对二甲基甲酰胺中的Fe 3 + 表现出猝灭反应检出限分别为2.3×10 –6 和8.6×10 –7 M。与此同时,化合物> 5 可以检测到4-硝基苯酚且具有检测限低至5.75×10 –7 M。

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