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H-bond supported coordination polymers of transition metal sulfites with different dimensionalities

机译:不同尺寸过渡金属亚硫酸盐的氢键支撑配位聚合物

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Three new transition metal-sulfite coordination complexes namely [(C6N4H18)NaCo(SO3)(2)(H2O)(3)], (1), [(C3N2H10)(2)NaCo(SO3)(2)(H2O)(2)]center dot H2O, (2), and [(C6N4H18)Zn-3(SO3)(3)], (3), have been synthesized under hydrothermal conditions in the presence of various organic amines where the amine behaves as an organic ligand. The complexes were characterized by PXRD, TGA and FTIR techniques. 1 shows the formation of a zero dimensional structure whereas 2 and 3 show two dimensional layer structures. The difference between 1 and 2 is due to the usage of different amines. The tetradentate amine in 1 dictates the coordination of sulfite groups in a cis-manner leading to the formation of a zero dimensional structure whereas in 2 the bidentate amine forces the sulfite group coordination in a trans-manner resulting in a two dimensional structure. In 3, the tetradentate amine caps one of the Zn centres, however the other two unique zinc ions coordinate with the sulfite anion to form interconnected cyclic dimers which gives a two dimensional layer structure. The subtle changes in the hydrogen bonding pattern and its consequence on the overall lattice to give a three dimensional network for 1 and 2 and two dimensional layer structure for 3 have been emphasized in detail.
机译:三种新的过渡金属-亚硫酸盐配位化合物,即[(C6N4H18)NaCo(SO3)(2)(H2O)(3)],(1),[(C3N2H10)(2)NaCo(SO3)(2)(H2O)( 2)]中心点H2O(2)和[(C6N4H18)Zn-3(SO3)(3)],(3)在各种有机胺存在下的水热条件下合成,其中胺表现为有机配体。通过PXRD,TGA和FTIR技术对复合物进行了表征。图1示出了零维结构的形成,而图2和3示出了二维层结构。 1和2之间的差异是由于使用了不同的胺。 1中的四齿胺决定了顺式构象中亚硫酸盐基团的配位,导致形成零维结构,而2中的二齿胺则迫使亚硫酸盐基团形成了反式构象,从而形成了二维结构。在图3中,四齿胺将一个锌中心封端,但是另外两个独特的锌离子与亚硫酸根阴离子配位,形成相互连接的环状二聚体,从而形成二维层结构。氢键键合模式的细微变化及其对整个晶格的影响已得到详细说明,以给出1和2的三维网络和3的二维层结构。

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