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首页> 外文期刊>Crystal growth & design >Heterobimetallic copper(II) uranyl carboxyphenylphosphonates
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Heterobimetallic copper(II) uranyl carboxyphenylphosphonates

机译：异双金属铜（II）铀酰羧苯基膦酸酯

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The hydrothermal reactions of uranyl nitrate with diethyl(2- ethoxycarbonylphenyl)phosphonate, 3-carboxyphenylphosphonic acid, or diethyl(3-ethoxycarbonylphenyl)phosphonate with HF result in the formation of [Cu(H_2O)]_2Cu(H_2O)_2[(UO _2)(PO_3C_6H_4CO_2H)(PO _3C_6H_4CO_2)]_2 (UCuCPPE-1) and [H_3O]_2[Cu(H_2O)]_2[(UO _2)_3(PO_3C_6H_4CO _2)_4]?3H_2O (UCuCPPE-2). UCuCPPE-1 is constructed from the UO_2~(2+) moiety coordinated by four additional oxygen donor atoms from the phosphonate moiety, resulting in a tetragonal bipyramidal geometry. The phosphonate groups span between the uranyl cations to create chains that are in turn linked into sheets by square planar and square pyramidal Cu(II) units. The phenyl groups separate the sheets from one another. The structure of UCuCPPE-2 consists of a three-dimensional network of tetragonal bipyramidal and pentagonal bipyramidal U(VI) centers. These units form chains that the phosphonate groups link into sheets. The sheets are then joined together by square pyramidal CuO_5 units to create the three-dimensional network. In UCuCPPE-1, the phosphonate group coordinates to both uranium and copper, while the carboxylate moiety binds exclusively to the copper(II) centers. In contrast, the oxygen atoms from the phosphonate and carboxylate moieties in UCuCPPE-2 coordinate exclusively to the uranium and copper centers, respectively. Despite the presence of Cu(II) ions in these compounds, they both fluoresce, showing characteristic vibronically coupled charge-transfer based emission.
机译：硝酸铀酰与（2-乙氧基羰基苯基）膦酸二乙酯，3-羧基苯基膦酸或（3-乙氧基羰基苯基）膦酸二乙酯与HF的水热反应导致[Cu（H_2O）] _ 2Cu（H_2O）_2 [（UO _2） ）（PO_3C_6H_4CO_2H）（PO _3C_6H_4CO_2）] _ 2（UCuCPPE-1）和[H_3O] _2 [Cu（H_2O）] _ 2 [（UO _2）_3（PO_3C_6H_6H_4CO _2）_4]？3H_2O（UCuCPPE-2）。 UCuCPPE-1由UO_2〜（2+）部分与膦酸酯部分中的另外四个氧供体原子配位而构建，从而形成了四边形双锥体几何形状。膦酸酯基团横跨在铀酰阳离子之间以形成链，这些链又通过方形平面和方形金字塔形的Cu（II）单元连接成片。苯基使薄片彼此分开。 UCuCPPE-2的结构由四角双锥体和五角双锥体U（VI）中心组成的三维网络。这些单元形成膦酸酯基团链接成片的链。然后，将这些薄片通过方形金字塔形CuO_5单元连接在一起，以创建三维网络。在UCuCPPE-1中，膦酸酯基团与铀和铜均配位，而羧酸盐部分仅与铜（II）中心键合。相反，UCuCPPE-2中膦酸酯和羧酸酯部分的氧原子分别仅与铀和铜中心配位。尽管这些化合物中存在Cu（II）离子，但它们都发出荧光，显示出特征性的基于振动耦合电荷转移的发射。

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