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Articles by Ying Ma
Total Records ( 3 ) for Ying Ma
  Yan Ding , Hongli Chen , Enbo Wang , Ying Ma and Xinlong Wang
  A new compound [Zn(phen)2]2[ GCOO_A_293169_O_XML_IMAGES\GCOO_A_293169_O_ILM0001.gif][Zn(phen)2(H2O)]2[ GCOO_A_293169_O_XML_IMAGES\GCOO_A_293169_O_ILM0002.gif] · 7H2O (phen = phenanthroline) has been synthesized under hydrothermal conditions and characterized by IR, TG analysis and single-crystal X-ray diffraction. Compound 1 crystallizes in the monoclinic system, space group P21/C, a = 21.609(4) Aring, b = 16.537(3) Aring, c = 21.279(4) Aring, agr = 90°, β = 100.25(3)°, γ = 90°, V = 7483(3) Aring3, Z = 2. The basic building unit in 1 is the [PMo8V6O42] cluster. The most remarkable structural feature of 1 is that there exist two distinct [PMo8V6O42] clusters. One is covalently linked by [Zn(phen)2] complexes to form a 2D covalent layer, the other supports two [Zn(phen)2(H2O)] complexes forming a discrete bisupporting structure. It is interesting that discrete bisupporting clusters locate in the space of two adjacent covalently layers to form a 3D supramolecular framework.
  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.
  Xun Sun , Wei-hui Wu , Qian Liu , Mei-sha Chen , Ye-ping Yu , Ying Ma , Yu-fen Zhao and Yan-mei Li

Abnormal assembly of monomeric β-amyloid (Aβ) in Alzheimer's disease leads to the formation of most neurotoxic oligomers in vivo. In this study, we explored a linking strategy to design hybrid peptides, by combining the Aβ recognition motif and the solvent disruptive sequences. We found that in vitro all synthetic peptides with the recognition motif can affect Aβ fibrillization and alter the morphology of Aβ aggregates variously, different from those without the recognition motif. The effects of peptides containing recognition motif on Aβ aggregation correlate with their abilities to change the surface tension of solutions. In addition, compounds with the recognition motif, not those without such motif, can inhibit cytotoxicity of Aβ in cell culture probably by decreasing the amount of toxic Aβ oligomers. These results indicate that recognition domain and solvent effect should be considered as important factors when designing molecules to target Aβ aggregation.

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