Jian-Ming Gu

Zhejiang University, Hang-hsien, Zhejiang Sheng, China

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Publications (29)6.25 Total impact

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    ABSTRACT: Objective: To prepare Form A and Form B of benazepril hydrochloride and to compare the differences in spectrums, thermodynamics and crystal structure between two polymorphic forms. Methods: Form A and Form B of benazepril hydrochloride were characterized by Fourier transform infrared spectroscopy (IR), thermal gravimetric analysis (TG), differential scanning calorimetry (DSC), powder x-ray diffraction (PXRD) and single crystal x-ray diffraction (SCXRD). Results: Preparation method, crystal structure and polymorphic stability of Form A and Form B of benazepril hydrochloride were obtained. Based on the analysis of crystal structure of both polymorphs, Form A belonged to monocline space group P2(1) with a=7.8655(4)Å, b= 11.7700(6)Å, c= 13.5560(7)Å, β= 102.9470(10)°, V=1223.07 (11)Å(3) and Z=2, while Form B belonged to orthorhombic space group P212121, with a=7.9353(8)Å, b=11.6654(11)Å, c=26.6453(16)Å, V=2466.5(4)Å(3) and Z=4. From the DSC and XRD results, Form B of benazepril hydrochloride could be transformed into Form A after heating treatment. Conclusion: Form A and Form B of benazepril hydrochloride are both anhydrous and displayed different polymorphs due to different molecular configuration. Furthermore, Form A exhibits more stable than Form B at high temperatures.
    Zhejiang da xue xue bao. Yi xue ban = Journal of Zhejiang University. Medical sciences 11/2012; 41(6):639-46.
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    ABSTRACT: THE TITLE COMPOUND (SYSTEMATIC NAME: 2-{2-[4-(dibenzo[b,f][1,4]thia-zepin-11-yl)piperazin-1-yl 1-oxide]eth-oxy}ethanol-fumaric acid (2/1)), C(21)H(25)N(3)O(3)S·0.5C(4)H(4)O(4), is one of the oxidation products of quetiapine hemifumaric acid. In the tricyclic fragment, the central thia-zepine ring displays a boat conformation and the benzene rings are inclined to each other at a dihedral angle of 72.0 (2)°. The piperazine ring adopts a chair conformation with its eth-oxy-ethanol side chain oriented equatorially. In addition to the main mol-ecule, the asymmetric unit contains one-half mol-ecule of fumaric acid, the complete mol-ecule being generated by inversion symmetry. In the crystal, O-H⋯O hydrogen bonds link the components into corrugated layers parallel to bc plane.
    Acta Crystallographica Section E Structure Reports Online 06/2012; 68(Pt 6):o1753-4. · 0.35 Impact Factor
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    ABSTRACT: IN THE TITLE COMPOUND, [SYSTEMATIC NAME: 9-fluoro-2,3-dihydro-3-methyl-10-(4-methyl-piperazin-1-yl)-7-oxo-7H-pyrido[1,2,3-ij][1,2,4]benzoxadiazine-6-carb-oxy-lic acid], C(17)H(19)FN(4)O(4), the carbonyl and carboxyl groups are coplanar with the quinoline ring, making a dihedral angle of 2.39 (2)°. The piperazine ring adopts a chair conformation and the oxadiazinane ring displays an envelope conformation with the CH(2) group at the flap displaced by 0.650 (2) Å from the plane through the other five atoms. The mol-ecular structure exhibits an S(6) ring motif, owing to an intra-molecular O-H⋯O hydrogen bond. In the crystal, weak C-H⋯F hydrogen bonds link mol-ecules into layers parallel to the ab plane.
    Acta Crystallographica Section E Structure Reports Online 04/2012; 68(Pt 4):o998-9. · 0.35 Impact Factor
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    Min Liu, Xiu-Rong Hu, Jian-Ming Gu, Gu-Ping Tang
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    ABSTRACT: The title compound {systematic name: N-[1-(3-chloro-phen-yl)-1-oxopropan-2-yl]-tert-butanaminium bromide propanol hemisolvate}, C(13)H(19)ClNO(+)·Br(-)·0.5C(3)H(8)O, crystallizes with two independent bupropion hydro-bromide ion pairs and a solvent 1-propanol mol-ecule in the asymmetric unit. In both mol-ecules, the expected proton transfer from HBr to the amino group of the bupropion mol-ecule is observed, and intra- and inter-molecular N-H⋯Br hydrogen-bond inter-actions are formed. These inter-actions link the mol-ecules into hydrogen-bond dimers. The side chains of the two cations have slightly different orientations. The 1-propanol solvent mol-ecule is linked to a bromide ion by an O-H⋯Br hydrogen bond.
    Acta Crystallographica Section E Structure Reports Online 10/2011; 67(Pt 10):o2772. · 0.35 Impact Factor
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    ABSTRACT: The title compound {systematic name: 7-[(1S,6S)-8-aza-2-azonia-bicyclo-[4.3.0]non-8-yl]-1-cyclo-propyl-6-fluoro-8-meth-oxy-4-oxo-1,4-dihydro-quinoline-3-carb-oxy-lic acid chloride monohydrate}, C(21)H(25)FN(3)O(4) (+)·Cl(-)·H(2)O, crystallizes with two moxi-floxa-cinium cations, two chloride ions and two uncoordinated water mol-ecules in the unit cell. The crystal structure has a pseudo-inversion center except for the chloride ions. In both moxi-floxa-cinium cations, the quinoline rings are approximately planar, the maximum atomic deviations being 0.107 (3) and 0.118 (3) Å. The piperidine rings adopt a chair conformation while the pyrrolidine rings display a half-chair conformation. In the crystal, the carboxyl groups, the protonated piperidyl groups, the uncoordinated water mol-ecule and chloride anions participate in O-H⋯O, O-H⋯Cl and N-H⋯Cl hydrogen bonding; weak inter-molecular C-H⋯O and C-H⋯Cl hydrogen bonding is also present in the crystal structure.
    Acta Crystallographica Section E Structure Reports Online 10/2011; 67(Pt 10):o2773-4. · 0.35 Impact Factor
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    ABSTRACT: In the title compound {systematic name: [2-(3-cyano-4-isobutyl-oxyphen-yl)-4-methyl-1,3-thia-zole-5-carb-oxy-lic acid (febuxostat) methanol monosolvate}, C(16)H(16)N(2)O(3)S·CH(4)O, the benzene and thia-zole rings in the febuxostat mol-ecule are twisted at 5.3 (1)°. In the crystal structure, inter-molecular O-H⋯O and O-H⋯N hydrogen bonds link the febuxostat and methanol mol-ecules into helical chains along the 2(1) screw axis.
    Acta Crystallographica Section E Structure Reports Online 05/2011; 67(Pt 5):o1232. · 0.35 Impact Factor
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    Xiao Lu, Gu-Ping Tang, Jian-Ming Gu, Xiu-Rong Hu
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    ABSTRACT: IN THE CRYSTAL STRUCTURE OF THE TITLE COMPOUND [SYSTEMATIC NAME: 2-(4b-fluoro-5-hy-droxy-4a,6a,8,8-tetra-methyl-2-oxo-2,4a,4b,5,6,6a,9a,10,10a,10b,11,12-dodeca-hydro-7,9-dioxa-penta-leno[2,1-a]phenanthren-6b-yl)-2-oxoethyl acetate], C(26)H(33)FO(7), the mol-ecules are connected by inter-molecular O-H⋯O hydrogen bonds into an infinite supra-molecular chain along the b axis. The mol-ecular framework consists of five condensed rings, including three six-membered rings and two five-membered rings. The cyclo-hexa-2,5-dienone ring is nearly planar [maximum deviation = 0.013 (3) Å], while the cyclo-hexane rings adopt chair conformations. The two five-membered rings, viz. cyclo-pentane and 1,3-dioxolane, display envelope conformations.
    Acta Crystallographica Section E Structure Reports Online 01/2011; 67(Pt 2):o360. · 0.35 Impact Factor
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    Wei-Jian Lou, Xiu-Rong Hu, Jian-Ming Gu
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    ABSTRACT: The crystal structure of the title compound, C(12)H(22)N(+)·Cl(-)·0.1H(2)O, consists of (3,5-dimethyl-1-adamantyl)ammonium chloride (memanti-nium chloride) and uncoordinated water mol-ecules. The four six-membered rings of the memanti-nium cation assume typical chair conformations. The Cl(-) counter-anion links with the memanti-nium cation via N-H⋯Cl hydrogen bonding, forming channels where the disordered crystal water molecules are located. The O atom of the water mol-ecule is located on a threefold rotation axis, its two H atoms symmetrically distributed over six sites; the water mol-ecule links with the Cl(-) anions via O-H⋯Cl hydrogen bonding.
    Acta Crystallographica Section E Structure Reports Online 09/2009; 65(Pt 9):o2191. · 0.35 Impact Factor
  • Jian-Ming Gu, Xiu-Rong Hu
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    ABSTRACT: Sandine, C21H22N2O3, which is a naturally occurring biologically active product derived from plants, is important as a possible starting material for the syntheses of valuable pharmaceuticals. The sandine framework consists of two five- and three six-membered condensed rings. One of the six-membered rings adopts a screw-boat conformation, one adopts an envelope conformation and the third is planar. Both five-membered rings have envelope structures. Mol­ecules are linked into dimers by N—H⋯O hydrogen bonds. The asymmetric unit contains two mol­ecules.
    Acta Crystallographica Section E Structure Reports Online 11/2006; 62(11). · 0.35 Impact Factor
  • Xiu-Rong Hu, Li-Li Wang, Jian-Ming Gu
    Acta Crystallographica Section E Structure Reports Online 10/2006; 62(10). · 0.35 Impact Factor
  • Jian-Ming Gu, Xiu-Rong Hu, Wei-Ming Xu
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2006; 62(1).
  • Xiu-Rong Hu, Wei-Ming Xu, Jian-Ming Gu
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2006; 62(1).
  • Wei-Ming Xu, Xiu-Rong Hu, Jian-Ming Gu
    Acta Crystallographica Section E Structure Reports Online 12/2005; 61(12). · 0.35 Impact Factor
  • Gu-Ping Tang, Jian-Ming Gu
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    ABSTRACT: In the title compound, C12H13N3O2S, the dihedral angle between the pyridine and benzene rings is 62.1 (1)°. Mol­ecules are linked via N—H⋯N and N—H⋯O hydrogen bonds, forming a ribbon motif along the a axis.
    Acta Crystallographica Section E Structure Reports Online 10/2005; 61(10). · 0.35 Impact Factor
  • Gu-Ping Tang, Jian-Ming Gu
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    ABSTRACT: The title compound, C18H14F4N2O2S·CHCl3, forms a one-dimensional hydrogen-bonded chain via a single O—H⋯N inter­action; the chain runs approximately along the [110] axis. The two benzene rings are almost parallel to one another, forming a dihedral angle of 8.43 (8)°.
    Acta Crystallographica Section E Structure Reports Online 10/2005; 61(10). · 0.35 Impact Factor
  • Xiu-Rong Hu, Yun-Wu Wang, Jian-Ming Gu
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    ABSTRACT: The asymmetric unit of the title compound, di-μ-aqua-1:2κ4O:O-triaqua-1κ3O-dilosartanido-1κN;2κ2N,N′-dipotassium dihydrate, [K2(C22H22ClN6O)2(H2O)5]·2H2O, is composed of two losartan anions, two K+ cations and seven water mol­ecules. Some water mol­ecules bridge the potassium ions linking the mol­ecules to form an infinite chain. The two potassium ions have different environments; one is six-coordinated by three water O atoms and three tetra­zole N atoms, whereas the other is five-coordinated by five water O atoms. Extensive hydrogen-bonding inter­actions lead to a three-dimensional structure.
    Acta Crystallographica Section E Structure Reports Online 09/2005; 61(9). · 0.35 Impact Factor
  • Gu-Ping Tang, Jian-Ming Gu
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    ABSTRACT: In the title compound, C17H19N5, the almost ideally planar triazole ring forms a dihedral angle of 75.1 (1)° with the benzene ring. There are inter­molecular π–π inter­actions.
    Acta Crystallographica Section E Structure Reports Online 08/2005; 61(8). · 0.35 Impact Factor
  • Jian-Ming Gu, Xiu-Rong Hu, Wei-Ming Xu
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2005; 61(11).
  • Wei-Ming Xu, Xiu-Rong Hu, Jian-Ming Gu
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2005; 61(12).
  • Xiu-Rong Hu, You-Chu Zhang, Jian-Ming Gu
    Acta Crystallographica Section E-structure Reports Online - ACTA CRYSTALLOGR E-STRUCT REP. 01/2005; 61(11).