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Articles by Xiao-Jun Zhao
Total Records ( 4 ) for Xiao-Jun Zhao
  Qiang Chen , En-Cui Yang , Run-Wen Zhang , Xiu-Guang Wang and Xiao-Jun Zhao
  Three new coordination polymers, [M(Ambt)2(Nip)]n (M = Cd for 1 and Zn for 2) and [Ni0.5(Nip)(H2O)2] (HAmbt) (3) (H2Nip = 5-nitroisophthalic acid, Ambt = 2-amino-6-methylbenzothiazole), have been synthesized by hydrothermal methods and are further characterized by X-ray diffraction, IR spectra, elemental analysis, TG-DTA and fluorescence spectra. The structural analyses suggest that 1 and 2 are 1-D chains bridged by Nip anions, in which Ambt is a monodentate ligand and the carboxylate groups of Nip are monodentate and chelating bidentate. Complex 3 consists of two individual fragments, six-coordinate mononuclear NiII and HAmbt cation, in which HAmbts are encapsulated into the concave of the 2-D layer formed by mononuclear units through classic N-H·· · O hydrogen bonds. Abundant hydrogen bond interactions drive the formation of packing structure of the complexes. The three solid complexes display strong emission peaks from intraligand charge transfer similar to free Ambt at room temperature.
  Yuan Yuan Liu , Bin Ding , En-Cui Yang , Xiao-Jun Zhao and Xiu Guang Wang
  Using 3,5-dimethyl-4-amino-1,2,4-triazole (L) and corresponding Ag(I), K(I) salts under ammonia solution and hydrothermal conditions, a triazole-silver(I)-potassium(I) complex K[Ag2L2(µ3-Cl)(µ2-Cl)2]n (1) has been isolated. In 1, µ3-Cl, µ2-Cl and L bridge AgI ions forming a rare 1-D [Ag2L2(µ3-Cl)(µ2-Cl)2]- anion while K+ cations are located between neighboring anion chains. Strong solid-state fluorescence spectrum of 1 was also investigated showing that the excited peak is located at 320 nm while the maximum emission peak is located at 440 nm.
  Jing Qian , Jin-Lei Tian , Li Feng , Wen Gu , Xiao-Jun Zhao and Shi-Ping Yan
  Two new µ-carboxylato-bridged binuclear copper(II) complexes [Cu2(bpea)2 (µ-C2O4)](ClO4)2 · H2O (1) and [Cu2(bpma)2 (µ-ta)](ClO4)2 · H2O (2) (bpea = N,N-bis(2-pyridylmethyl)ethylamine; bpma = N,N-bis(2-pyridylmethyl)methylamine; ta = terephthalate dianion) have been synthesized and structurally determined by X-ray diffraction. Complex 1 is crystallized in a monoclinic space group C2/c with unit cell parameters a = 21.539(17) Å, b = 12.608(10) Å, c = 13.117(11) Å, β = 96.788(13)°. In 1, each Cu(II) is five-coordinate, square-pyramidal geometry with a CuN3O2 donor set. Complex 2 is crystallized in a monoclinic space group P21/n with unit cell parameters a = 11.346(3) Å, b = 15.418(4) Å, c = 11.958(3) Å, β = 116.519(4)°. In 2, each Cu(II) also is square-pyramidal CuN3O2 core, where three N- and one O-donors are equatorial and an oxygen of the bridging ligand occupies the axial site with a weak link. Elemental analyses, IR, UV and EPR spectra of the complexes were determined.
  Wen Feng , Ruo-Nan Chang , Jing-Yi Wang , En-Cui Yang and Xiao-Jun Zhao
  Four 1,3-bis(1,2,4-triazol-1-yl)propane (btp)-based transition metal complexes, {[Zn(btp)3] ⋅(ClO4)2}n (1), [Zn(btp)2(dca)2]n (2), [Zn(btp)(NCS)2] (3), and [Mn(btp)2(NCS)2]n (4), have been obtained by introducing small anionic coligands and structurally characterized by single crystal X-ray diffraction, elemental analysis, IR spectra, thermogravimetric curves, and solid luminescence spectra. Structural determinations reveal that the polymeric triple-stranded chain for 1 without coligand is changed into 1-D double-stranded chains for 2 and 4, and discrete binuclear structure for 3. Compared with 1, the mixed-ligand complexes are moderately destabilized for 2 and 4, and slightly enhanced for 3. Additionally, the four solid complexes exhibit strong emissions, suggesting their potential applications as luminescent materials.
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