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Articles by Xinxin Xu
Total Records ( 2 ) for Xinxin Xu
  Jingxin Meng , Xinlong Wang , Ying Ma , Enbo Wang and Xinxin Xu
  Two new polyoxotungstates with dafo and 4,4`-bipy ligands, [Ag(dafo)2]2{[Ag(4,4`-bipy)]2SiW12O40} (1) and [Cd2(dafo)4(4, 4`-bipy)(H2O)2](dafo) SiW12O40 (2) (dafo = 4, 5-diazafluoren-9-one, 4,4`-bipy = 4,4`-bipyridine), have been hydrothermally synthesized and characterized by elemental analyses, IR, TG and single crystal X-ray diffraction. Compound 1 consists of a one-dimensional (1D) chain constructed from [Ag(4,4`-bipy)]+ cations. With the connection of [Ag(4,4`-bipy)]+ cations and α-[SiW12O40]4- anions, two-dimensional (2D) structure was built. Because of the π-π stacking interactions between pyridyl rings of 4,4`-bipy from adjacent chains, three-dimensional (3D) structure was generated. Furthermore, the C-H ... O weak interaction between [Ag(dafo)2]24+ and polytungstate made the structure more stable. Like 1, compound 2 is a three-dimensional (3D) supramolecular compound constructed from a transition-metal complex fragment [Cd2(dafo)4(4,4`-bipy)(H2O)2]4+, SiW12O404- and free dafo through C-H ... O weak interactions. To our best knowledge, it is the first time that saturated Keggin-type polyoxotungstates interact with dafo and 4,4`-bipy at the same time.
  Xinxin Xu , Xiaoxia Liu , Xia Zhang and Ting Sun
  Five new coordination polymers synthesized from d10 metal ions, aliphatic carboxylic acids, and bidentate nitrogen ligands have been characterized with single crystallographic X-ray analysis, IR, and TG. Compound 1 has a twofold 3-D network. During the synthesis of 1, fumaric acid reacts with water giving malic acid, which coordinates Cd forming 2. If we use Zn instead of Cd, 1-D chain-like 3 is formed. With hydrogen bonds and π-π interactions, the 1-D covalent chains form a 3-D supramolecular network. The 3-D supramolecular networks connect together and form a twofold interpenetration structure. Compound 4 shows a 2-D layer structure. Compound 5 exhibits 1-D double-chain structure composed by hydrogen bonds. We studied the fluorescence of 1, 2, 3, and 5.
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