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首页> 外文期刊>Crystal growth & design >Influence of counteranions on the structural modulation of silver-di(3-pyridylmethyl)amine coordination polymers
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Influence of counteranions on the structural modulation of silver-di(3-pyridylmethyl)amine coordination polymers

机译:抗衡阴离子对银-二(3-吡啶基甲基)胺配位聚合物结构调节的影响

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The coordination chemistry of a flexible N-donor ligand di(3-pyridylmethyl)amine (dpma) with silver salts has been investigated. Six new silver coordination polymers, namely, [Ag(dpma)(H_2O)](NO _3) (1), [Ag(dpma)(CF_3CO_2)]·1/2H _2O (2), [Ag(dpma)](CF_3SO_3)·1/2H _2O (3), [Ag(dpma)](BF_4)·3/2H_2O (4), [Ag_3(dpma)_2(H_2O)](ClO_4)_3 (5), and [Ag(dpma)](PF_6) (6), have been prepared by slow diffusion reactions. All the polymeric structures of compounds 1-6 are described as topologic binodal networks in terms of Ag and dpma building blocks. Compounds 1-4 show a one-dimensional ladder-like chain structure, with both Ag and dpma as three-connected T-nodes; compound 5 is an uncommon one-dimensional metallamacrocycle-based chain structure, with Ag as two-connected I-node and dpma as three-connected T-node; compound 6 is a two-dimensional honeycomb-like layer structure, with both Ag and dpma as three-connected Y-nodes. Within the structures, the dpma ligand adopts a variety of structure conformations including gauche-trans-anti (1 and 2), trans-trans-anti (3 and 4), trans-trans-syn (3), gauche-gauche-syn (5), and trans-gauche-syn (6) conformations. For these Ag-dpma coordination polymers, the structural diversity and complexity are most likely attributed to the different coordinating nature, hydrogen-bonding propensity, and templating effect of the counteranions and solvent molecules. Solution studies suggest that compounds 1-6 would disaggregate to break down the polymeric structures and then to give multiple rapidly exchanging solution species in DMSO or acetonitrile. The thermal stabilities of compounds 1-6 are examined. In addition, the photoluminescent properties of compounds 1-6 are investigated in the solid state at room temperature.
机译:研究了柔性N供体配体二(3-吡啶基甲基)胺(dpma)与银盐的配位化学。六种新的银配位聚合物,即[Ag(dpma)(H_2O)](NO _3)(1),[Ag(dpma)(CF_3CO_2)]·1 / 2H _2O(2),[Ag(dpma)]( CF_3SO_3)·1 / 2H _2O(3),[Ag(dpma)](BF_4)·3 / 2H_2O(4),[Ag_3(dpma)_2(H_2O)](ClO_4)_3(5)和[Ag( dpma)](PF_6)(6),已通过缓慢扩散反应制备。就Ag和dpma结构单元而言,化合物1-6的所有聚合物结构都被描述为拓扑二元网络。化合物1-4显示一维梯状链结构,其中Ag和dpma均为三连接的T-节点;化合物5是一种不常见的一维基于金属大环的链结构,其中Ag为两个连接的I-节点,dpma为三个连接的T-节点;化合物6是二维蜂窝状层结构,其中Ag和dpma均作为三个连接的Y节点。在这些结构中,dpma配体采用多种结构构象,包括gauche-trans-anti(1和2),trans-trans-anti(3和4),trans-trans-syn(3),gauche-gauche-syn (5)和反式gauche-syn(6)构象。对于这些Ag-dpma配位聚合物,结构多样性和复杂性最可能归因于抗衡阴离子和溶剂分子的不同配位性质,氢键结合倾向以及模板效应。溶液研究表明,化合物1-6会分解,破坏聚合物结构,然后在DMSO或乙腈中产生多种快速交换的溶液。检查了化合物1-6的热稳定性。另外,在室温下在固态下研究化合物1-6的光致发光性质。

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