Dai Jun

Publications (6)0 Total impact

• Article: (2,2′-Bipyridine-κ2N,N′)bis(4-hydroxybenzoato-κ2O,O′)lead(II) monohydrate

  Dai Jun, Yang Juan
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  ABSTRACT: The reaction of lead acetate, 4-hydroxybenzoic acid and 2,2′-bipyridine in aqueous solution gave the title complex, [Pb(C7H5O3)2(C10H8N2)]·H2O. The asymmetric unit contains one PbII atom, two 4-hydroxybenzoate ligands, one 2,2′-bipyridine ligand and one uncoordinated water molecule. The PbII atom is hexacoordinated in a distorted tetragonal-bipyramidal geometry and is chelated by four carboxylate O atoms and two N atoms. O—H...O hydrogen-bonding interactions, involving the uncoordinated water, the carboxylate O atoms and hydroxy O atoms, produce a three-dimensional supramolecular structure.
  Acta Crystallographica Section E. 01/2010;
• Article: 2,3,5-Trimethyl-1,4-hydroquinone

  Dai Jun, Xie Min-Hao, Liu Ya-Ling, Zou Pei, Wu Hao
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  ABSTRACT: The molecule of the title compound, C9H12O2, is approximately planar (mean atomic deviation = 0.0346 Å) and disposed about a crystallographic centre of symmetry. The H atom of the benzene ring is disordered over four orientations, with occupancies of 0.100 (3) and 0.401 (3) at the C atoms in the 2- and 3-positions and the same at their symmetric location. The H atoms of methyl group at the 2-position are disordered over two positions of equal occupancy. In the crystal structure, adjacent molecules are linked through O—H...O hydrogen bonds, forming a two-dimensional network.
  Acta Crystallographica Section E. 01/2010;
• Article: (2,2′-Bipyridine-κ2N,N′)bis(4-methylbenzoato-κ2O,O′)lead(II)

  Dai Jun, Yang Juan, Li Yingjie
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  ABSTRACT: In the title compound, [Pb(C8H7O2)2(C10H8N2)], the PbII ion is coordinated by two N atoms from one 2,2′-bipyridine ligand and four O atoms from two 4-methylbenzoate anions in a distorted pseudo-square-pyramidal environment, considering one of the carboxylate anions as an apical ligand. Pairs of complex molecules related by inversion centers are organized into dimers via pairs of Pb...O interactions [3.185 (2) Å] and stacking interactions between 2,2′-bipyridine and 4-methylbenzoate ligands, with a mean distance between their planes of 3.491 Å.
  Acta Crystallographica Section E. 01/2010;
• Article: Bis(benzoato-κ2O,O′)(1,10-phenanthroline-κ2N,N′)lead(II) benzoic acid monosolvate

  Dai Jun, Yang Juan, Li Jiantong
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  ABSTRACT: The reaction of lead acetate, benzoic acid and 1,10-phenanthroline (phen) in aqueous solution yielded the title complex, [Pb(C7H5O2)2(C12H8N2)]·C7H6O2. In the crystal, the PbII ion is hexacoordinated by two N atoms from one 1,10-phenanthroline ligand and four O atoms from two chelate benzoate anions. If the second benzoate ligand is treated as one coordination site, the overall coordination may be represented as a distorted pseudo-square pyramid. An intermolecular O—H...O hydrogen bond links the solvent benzoic acid molecule with a metal-coordinated benzoate ligand. The shortest Pb...Pb distance is 3.864 (4) Å, indicating a weak metal–metal interaction. Two complex molecules related by an inversion centre form dimeric units via Pb...O interactions of 3.206 (4) Å.
  Acta Crystallographica Section E. 01/2010;
• Article: catena-Poly[[(benzoato-κ2O,O′)(2,2′-bipyridine-κ2N,N′)lead(II)]-μ3-nitrato-κ4O:O,O′:O′′]

  Yang Juan, Dai Jun, Wang Xiaohan
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  ABSTRACT: In the title coordination polymer, [Pb(C7H5O2)(NO3)(C10H8N2)]n, the PbII ion is eight-coordinated by two N atoms from one 2,2′-bipyridine ligand, two O atoms from one benzoate anion and four O atoms from three nitrate groups (one chelating, two bridging) in a distorted dodecahedral geometry. Adjacent PbII ions are linked by bridging nitrate O atoms through the central Pb2O2 and Pb2O4N2 cores, resulting in an infinite chain structure along the b axis. The crystal structure is stabilized by π–π stacking interactions between 2,2′-bipyridine and benzoate ligands belonging to neighboring chains, with shortest centroid–centroid distances of 3.685 (8) and 3.564 (8) Å.
  Acta Crystallographica Section E. 01/2010;
• Article: catena-Poly[[aqua(3-methylbenzoato-κ2O,O′)lead(II)]-μ-3-methylbenzoato-κ4O:O,O′:O′]

  Dai Jun, Yang Juan, An Xiaobing
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  ABSTRACT: The reaction of lead(II) acetate and 3-methylbenzoic acid (MBA) in aqueous solution yielded the title polymer, [Pb(C8H7O2)2(H2O)]n. The asymmetric unit contains two PbII atoms, four MBA ligands and two water molecules. Each PbII cation is heptacoordinated and chelated by four carboxylate O atoms from two MBA ligands. The Pb atoms are bridged through the carboxylate O atoms from another two MBA ligands, leading to a central Pb2O2 core. The Pb—O bond lengths are in the range 2.325 (3)–2.757 (4) Å. The intra- and interdimer Pb...Pb distances are 4.2942 (3) and 4.2283 (3) Å, respectively, indicating little direct metal–metal interaction. The coordinating water molecules and carboxylate O atoms are involved in extensive O—H...O hydrogen-bonding interactions. The complex has an extended ladder-like chain structure and the chains are assembled by hydrogen bonds and π–π interactions [centroid–centroid distance = 3.6246 (3) Å] into a three-dimensional supramolecular structure.
  Acta Crystallographica Section E. 01/2009;