Cai-Feng Bi

Ocean University of China, Tsingtao, Shandong Sheng, China

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Publications (28)22.75 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: 3D structure of the Cu(II) complex. All hydrogen atoms and free solvent (methanol) molecules are omitted for clarity, except for those engaged in hydrogen bonding.
    Inorganic Chemistry Communications 12/2014; · 2.06 Impact Factor
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    ABSTRACT: A ternary coordination complex 2Cu(C14H8NO3Cl)(C12H8N2)·3CH3OH of a Schiff base (C14H8NO3Cl: 4-chloroanthranilic acid–salicylaldehyde) was synthesized from 4-chloroanthranilic acid, salicylaldehyde, copper acetate and 1,10-phenanthroline and characterized by physicochemical and spectroscopic methods. X-ray crystallography shows that the copper atom is five coordinated by the imine nitrogen, two nitrogen atoms from 1,10-phenanthroline, the hydroxyl oxygen and the carboxylate oxygen atom. The interaction of the complex with calf-thymus DNA was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy and viscosity. In addition, the cleavage reaction with pBR322 supercoiled plasmid DNA was investigated. The complex binds to DNA and also exhibits significant DNA cleavage activity.
    Transition Metal Chemistry 08/2014; 39(5). · 1.40 Impact Factor
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    ABSTRACT: Three novel transition metal coordination polymers, [Ni(C18H16N3O2)2·2CH3OH]n (1), [Zn(C18H16N3O2)2·4CH3OH]n (2) and [Cd(C18H16N3O2)2·2CH3OH]n (3) (C18H16N3O2=2-acetylpyridine-d-tryptophan) were synthesized and characterized by elemental analysis, IR, UV, 1H NMR and X-ray diffraction single crystal analysis. The analyses of the structures indicate that all three materials crystallize in the tetragonal crystal system, space group P41212. They have similar structures; i.e., the Schiff base coordinates in its deprotonated form and behaves as a hexadentate (4N+2O) coordinated ligand to form a distorted octahedron geometry. On the other hand, as a result of the alternate arrangement of chains through N–H···O intermolecular hydrogen bonds interactions, 2-D layers are formed for the three complexes. Furthermore, the luminescent properties and thermal stabilities of the three complexes were investigated.
    Journal of Inorganic and Organometallic Polymers and Materials 11/2013; 23(6). · 1.08 Impact Factor
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    ABSTRACT: A pair of stereoisomers of magnesium Schiff base complexes, [Mg(C18H16N3O2)2·2CH3OH] n (1) (C18H16N3O2: 2-acetylpyridine-l-tryptophan) and [Mg(C18H16N3O2)2·2CH3OH] n (2) (C18H16N3O2: 2-acetylpyridine-d-tryptophan), was synthesized and characterized by IR, UV, elemental analysis, 1H NMR, and X-ray diffraction single crystal analysis. The analyses of the structures indicate that they all crystallize in the tetragonal crystal system, space group P4 32 12 and P4 12 12, respectively. The two magnesium complexes have similar crystal structures. Mg(II) is six-coordinate with two nitrogens from C=N, two nitrogens from pyridine, and two carboxylic oxygens in different ligands forming a distorted octahedral geometry. Through N–H···O intermolecular hydrogen bonds a 2-D layer structure was formed. The interaction between 1 and calf thymus DNA was also investigated by UV absorption spectra, fluorescence emission spectra and viscometry. The results indicate that 1 interacts with DNA very strongly (K b = 2.01 × 107 L mol−1 and K sq = 0.195). The nature of the binding seems to be mainly an electrostatic interaction between DNA and the magnesium complex. Other binding modes, such as hydrogen bonds, may also exist.
    Journal of Coordination Chemistry 06/2013; 66(11). · 2.22 Impact Factor
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    ABSTRACT: A pair of stereoisomers of nickel Schiff base complexes, namely [Ni(C17H15N4O2)2·2CH3OH]n (1) (C17H15N4O2 = 2-acetylpyrazine-l-tryptophan) and [Ni(C17H15N4O2)2·2CH3OH]n (2) (C17H15N4O2 = 2-acetylpyrazine-d-tryptophan), were synthesized and characterized by physico-chemical and spectroscopic methods. The X-ray diffraction single-crystal analyses indicate that the structure of 2 is essentially 0D monomeric, while a 2D layer structure is formed through N–H…O intermolecular hydrogen bonds for 1. The interactions between complex 1 and calf thymus DNA were investigated by spectroscopic and viscometric methods. The results indicate that complex 1 interacts with DNA very strongly (K b = 1.01 × 107 mol−1 L and K sq = 1.11). The nature of the binding seems to be mainly an electrostatic interaction between DNA and the complex. However, other binding modes, such as hydrogen bonding, may also be present in this system.
    Transition Metal Chemistry 05/2013; 38(4). · 1.40 Impact Factor
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    ABSTRACT: A novel transition metal coordination polymer [Co3(C14H8NO4Cl)4(CH3OH)4·4CH3OH]n with Schiff base (C14H8NO4Cl: 4-chloroanthranilic acid- 2,4-dihydroxybenzaldehyde) was synthesized using 4-chloroanthranilic acid, 2,4-dihydroxybenzaldehyde and cobalt(II) acetate as source, and its structure was characterized by IR spectroscopy, elemental analysis, 1H NMR and single crystal X-ray diffraction. X-ray crystallography shows that every cobalt atom is six-coordinated. Two cobalt atoms on the two sides are respective coordinated with two nitrogen atoms from –C=N–, two carboxylic oxygen atoms and two hydroxyl oxygen atoms in different ligands, while the cobalt atom in the middle links two ligands on the side through two carboxylic oxygen atoms and coordinates with four oxygen atoms of methanol, forming a three-nuclear Co(II) complex. The complex forms a two-dimensional layer structure through O–H···O intermolecular hydrogen bonds. The interaction of the Co(II) complex with calf-thymus DNA (CT-DNA) was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy, viscosity and cyclic voltammetry. All measurements revealed that the Co(II) complex binds to DNA via a intercalative mode.
    Journal of Inorganic and Organometallic Polymers and Materials 05/2013; 24(3):582-590. · 1.08 Impact Factor
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    ABSTRACT: Three novel transition metal coordination complexes, Cu(C18H16N3O2)2·2CH3OH (1), Zn(C18H16N3O2)2·2CH3CH2OH (2) and Cd(C18H16N3O2)2·2CH3OH (3) (C18H16N3O2: 2-acetylpyridine-L-tryptophan) have been synthesized and characterized by IR, UV, elemental analysis, 1H NMR and X-ray diffraction single crystal analysis. The three crystals crystallize in the tetragonal crystal system, space group P43212. They are all six-coordinated by two nitrogen atoms from C=N, two nitrogen atoms from pyridine rings and two carboxylic oxygen atoms in different ligands, forming a distorted octahedron geometry. Each ligand serves as a bridging ligand to link metal ions through carboxylic oxygen atoms, leading to a three-dimensional coordination polymer. The anticancer activities of these three complexes on MDA-MB-231 breast cancer cells were also investigated. The results indicate that all of the three complexes can inhibit the cellular proliferation. Furthermore, Cd(C18H16N3O2)2·2CH3OH (3) has the highest anti-proliferative activity among the three complexes. In addition, Cd(C18H16N3O2)2·2CH3OH (3) can inhibit proteasomal chymotrypsin-like activity and also can induce apoptosis on human breast cancer MDA-MB-231 cells.
    Inorganic Chemistry Communications 08/2012; 22:68–72. · 2.06 Impact Factor
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    ABSTRACT: In the title compound, C(15)H(12)N(2)O(2), the dihedral angle between the two benzene rings is 83.55 (11)° In the crystal, the molecules are linked by O-H⋯O and N-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 09/2011; 67(Pt 9):o2493. · 0.35 Impact Factor
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    ABSTRACT: A Schiff base compound (L) was synthesized using o-vanillin and 4, 4′-diaminodiphenylmethane and characterized by elemental analysis, 1H NMR, 13C NMR, IR, electronic absorption spectra and X-ray diffraction single crystal analysis. The title compound(L) has no fluorescence intensity in a range of 450–650 nm, but its fluorescence spectrum shows enhancement in the intensity of the signal at 372 nm on binding with the Zn(II) cation from pH = 6 to 14. No such significant change was observed for other metal ions. Fluorescence intensity was linear with concentration of Zn (II) cation in a range from 1 × 10− 7 mol·L− 1 to 1.2 × 10− 5 mol·L− 1. This Schiff base compound is a promising system for the development of new fluorescent probes for the detection of Zn (II) cation.
    Inorganic Chemistry Communications 08/2011; 14(8):1297–1301. · 2.06 Impact Factor
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    ABSTRACT: The chiral Schiff base coordination polymer [Ce(H2L)3(NO3)3Ce(H2L)3(NO3)3(H2O)]n [H2L: trans-N,N′-bis-(2-hydroxy-1-naphthalidehy-dene)-(1R,2R)-cyclohexanediamine] was synthesized and characterized by infrared spectroscopy, elemental analysis and single-crystal X-ray diffraction analysis. X-ray crystallography shows that the Ce(III) coordinates with three neutral Schiff base ligands and three nitrates. One Ce(III) is nine-coordinated by three oxygen atoms from three different Schiff base ligands and six oxygen atoms from three nitrates, the other Ce(III) is ten-coordinated because of the coordination of an additional water molecule. Each Schiff base ligand serves as a bridging ligand to link Ce(III) ions through oxygen atoms, leading to a coordination polymer. The Ce(III) coordination polymer displays two dimensional plane grid network structure. The antiproliferation activities of the ligand H2L and its Ce(III) coordination polymer on MDA-MB-231 breast cancer cells were also studied by MTT (3-[4,5-dimethyltiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) method. The results indicate that H2L and [Ce(H2L)3(NO3)3Ce(H2L)3(NO3)3(H2O)]n can inhibit the cellularproliferation. Moreover, the coordination polymer had higher antiproliferative activity than that of the ligand.
    Synthetic Metals 08/2011; 161(15):1552-1556. · 2.22 Impact Factor
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    ABSTRACT: The natural bentonite was purified and changed to sodium form by NaCl via exchange reaction. Their characteristics, such as swelling volume, swelling value, colloid valence, ethylene blue adsorbed and cation exchange capacity, were measured. The results indicate that the property of Na-bentonite is better than that of natural bentonite. Using cetyltrimethylammonium bromide (CTMAB) and homopolymer of dimethyldiallyammomium chloride (PDMDAAC) as organo-intercalating reagents, two organic modified bentonites were prepared and characterized by Fourier transform infrared (FTIR), X-ray powder diffraction (XRD) and BET surface area. The XRD results showed that the CTMAB-bentonite and PDMDAAC-bentonite had typical X-ray diffraction peaks, and the d001 values increased to 1.89 and 1.45 nm, respectively. Combined with the results of FTIR, the modified reagents had been intercalated to the layer of bentonite. The BET areas, pore volumes and average pore diameters of the two organo-bentonites were decreased as compared to that of Na-bentonite.
    Guang pu xue yu guang pu fen xi = Guang pu 05/2011; 31(5):1393-7. · 0.27 Impact Factor
  • Acta Crystallographica Section E Structure Reports Online 08/2010; 66(8). · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(16)H(18)N(2)O, the dihedral angle between the benzene rings is 38.5 (2)°. The crystal packing is stabilized by weak C-H⋯N and C-H⋯O inter-actions and aromatic π-π stacking [centroid-centroid separations = 3.620 (5) and 3.546 (4) Å].
    Acta Crystallographica Section E Structure Reports Online 06/2010; 66(Pt 6):o1361. · 0.35 Impact Factor
  • Acta Crystallographica Section E Structure Reports Online 02/2010; 66(2). · 0.35 Impact Factor
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    ABSTRACT: In the title compound, C(21)H(23)N(3)O(4), the pyrazole ring forms dihedral angles of 21.58 (8) and 66.64 (7)° with the benzene and phenyl rings, respectively. The crystal structure is stabilized by weak inter-molecular C-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 8):o2149. · 0.35 Impact Factor
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    ABSTRACT: In the zwitterionic title compound, C(17)H(14)N(2)O, the dihedral angle between the naphthalene and pyridine ring systems is 3.56 (9)° and an intra-molecular N-H⋯O hydrogen bond generates an S(6) ring. In the crystal, mol-ecules are linked by C-H⋯O inter-actions.
    Acta Crystallographica Section E Structure Reports Online 01/2010; 66(Pt 2):o309. · 0.35 Impact Factor
  • Acta Crystallographica Section E Structure Reports Online 09/2009; 65(9). · 0.35 Impact Factor
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    ABSTRACT: The title complex, [CuCl(2)(C(9)H(13)N(3))], is mononuclear and contains a five-coordinate Cu(II) atom. The geometry of the Cu(II) atom can be described as tetra-gonal-pyramidal derived from the calculation of the value τ = 0.102. The three N atoms of the pyridine and ethane-1,2-diamine ligands and one Cl atom belong to the basal plane and the other Cl atom represents the axial position of the pyramid. The Cu atom is displaced by 0.2599 (2) Å from the basal plane towards the axial Cl atom. In the crystal, mol-ecules are linked into chains by inter-molecular N-H⋯Cl and C-H⋯Cl hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 04/2009; 65(Pt 4):m439. · 0.35 Impact Factor
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    ABSTRACT: The title compound, C(14)H(14)N(2)O(2), was obtained by a condensation reaction between o-vanillin and 5-methyl-pyridin-2-amine. In the mol-ecule, the dihedral angle between the pyridine and benzene rings is 9.08 (13)°. An intra-molecular hydrogen bond involving the imine N atom and the hydroxyl group may influence the conformation of the mol-ecule. The crystal structure is stabilized by weak C-H⋯O hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 9):o2170. · 0.35 Impact Factor
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    ABSTRACT: The title compound, C(14)H(10)N(2)OS, is nearly planar, with a maximum deviation of 0.0698 (13) Å from the mean plane, and exists in an E configuration with respect to the C=N bond. The dihedral angle between the two benzene rings is 2.81 (9)°. There is an intra-molecular O-H⋯N hydrogen bond and inter-molecular C-H⋯O and C-H⋯N hydrogen bonds.
    Acta Crystallographica Section E Structure Reports Online 01/2009; 65(Pt 4):o738. · 0.35 Impact Factor