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Search Results: 1 - 10 of 153234 matches for " Li Jian-Gang "
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Tetrakis[1-phenyl-3-(1H-1,2,4-triazol-1-yl-κN4)propan-1-one]bis(thiocyanato-κN)manganese(II)
Hua Cai,Ying Guo,Jian-Gang Li
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810047112
Abstract: In the mononuclear title complex, [Mn(NCS)2(C11H11N3O)4], the MnII atom, lying on an inversion center, is coordinated by two monodentate thiocyanate anions and four monodentate 1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one ligands in a distorted octahedral geometry. Each complex molecule is linked to four neighboring ones by weak C—H...N and C—H...S hydrogen bonds, forming a two-dimensional sheet parallel to (001).
Bis[2-(1H-pyrazol-3-yl-κN2)pyridine-κN]dithiocyanato-κN,κS-cadmium(II)
Hua Cai,Ying Guo,Jian-Gang Li
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810034604
Abstract: The molecular structure of the mononuclear complex, [Cd(SCN)2(C8H7N3)2], contains a CdII atom in a distorted octahedral coordination defined by five N atoms from two bidentate chelate 2-(1H-pyrazol-3-yl)pyridine ligands and by one SCN anion. The second SCN anion provides its S atom for completion of the coordination sphere. The complex is linked to four others by N—H...N and N—H...S hydrogen-bonding interactions between the pyrazol N—H group and the terminal S and N atoms of neighbouring SCN anions. This arrangement leads to the formation of sheets parallel to (100). Face-to-face π–π stacking interactions with shortest interplanar distances of 3.805 (2) and 3.696 (2) help to consolidate the crystal packing.
1-(3-Chloro-2-pyridyl)-3-methyl-1H-pyrazole-5-carboxylic acid
Hua Cai,Ying Guo,Jian-Gang Li,Yao Wu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809043906
Abstract: In the title molecule, C10H8ClN3O2, the dihedral angle between the pyridine and pyrazole rings is 64.01 (8)°. In the crystal structure, intermolecular O—H...N hydrogen bonds link molecules, forming extended chains along [001]. These chains are, in turn, linked by weak intermolecular C—H...O interactions, forming a two-dimensional network perpendicular to the b axis.
Bis[1-phenyl-3-(1H-1,2,4-triazol-1-yl-κN4)propan-1-one]bis(thiocyanato-κN)copper(II)
Hua Cai,Ying Guo,Jian-Gang Li
Acta Crystallographica Section E , 2012, DOI: 10.1107/s160053681203108x
Abstract: The title compound, [Cu(NCS)2(C11H11N3O)2], contains two independent CuII atoms. Each CuII atom, lying on an inversion center, is coordinated by two N atoms from two NCS anions and two N atoms from two monodentate 1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one ligands in a distorted square-planar geometry. Two S atoms from adjacent molecules occupy the axial positions with long Cu...S distances [3.0495 (10) and 3.1045 (9) ] and complete the overall distorted octahedral coordination sphere. Weak intermolecular C—H...O hydrogen bonds are present.
Bis(nitrato-κO)tetrakis[1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one]copper(II)
Hua Cai,Ying Guo,Jian-Gang Li,Yao Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s160053681103529x
Abstract: In the title complex, [Cu(NO3)2(C11H11N3O)4], the CuII atom is situated on a centre of inversion and is coordinated by two O atoms from two nitrate anions and four N atoms from four monodentate 1-phenyl-3-(1H-1,2,4-triazol-1-yl)propan-1-one ligands in a distorted octahedral geometry. Weak intermolecular C—H...O and C—H...N hydrogen bonds result in a supramolecular layer parallel to (101). These layers are connected by π–π interactions between the benzene rings [centroid–centroid distance = 3.891 (2) ].
Bis(μ-4-amino-3,5-dimethyl-4H-1,2,4-triazole-κ2N1:N2)bis(dibromidozinc)
Xia Zhu,Ying Guo,Jian-Gang Li,Yao Wu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811028789
Abstract: The centrosymmetric dimeric title complex, [Zn2Br4(C4H8N4)2], is isotypic with its [Zn2Cl4(C4H8N4)2], [Zn2I4(C4H8N4)2] and [Co2Cl4(C4H8N4)2] analogues. The zinc atom is bonded to two N atoms belonging to triazole bridging rings and to two terminal bromide ligands, in a geometry close to tetrahedral. Weak N—H...Br hydrogen bonds, with the amine functions as donor groups, are observed in the crystal structure, forming a three-dimensional supramolecular network.
Kantowski-Sachs universe cannot be closed
Xin-zhou Li,Jian-gang Hao
Physics , 2003, DOI: 10.1103/PhysRevD.68.083512
Abstract: In this paper, by analyzing the instability against spatially homogeneous and anisotropic perturbations of the Kantowski-Sachs-type during different cosmological epoch, we show that it is a theoretical consequence of the general relativity that the KS universe must be open or flat if it underwent the matter dominated and/or radiation dominated era in its past evolution, which theoretically confirms the flatness of our observable universe.
Attractor Solution of Phantom Field
Jian-gang Hao,Xin-zhou Li
Physics , 2003, DOI: 10.1103/PhysRevD.67.107303
Abstract: In light of recent study on the dark energy models that manifest an equation of state $w<-1$, we investigate the cosmological evolution of phantom field in a specific potential, exponential potential in this paper. The phase plane analysis show that the there is a late time attractor solution in this model, which address the similar issues as that of fine tuning problems in conventional quintessence models. The equation of state $w$ is determined by the attractor solution which is dependent on the $\lambda$ parameter in the potential. We also show that this model is stable for our present observable universe.
Phantom Cosmic Dynamics: Tracking Attractor and Cosmic Doomsday
Jian-gang Hao,Xin-zhou Li
Physics , 2003, DOI: 10.1103/PhysRevD.70.043529
Abstract: We study the dynamics of phantom model and give the conditions for potentials to admit tracking attractor, de Sitter attractor and big rip attractor. Especially, we show that phantom models with exponential and inverse power law potentials do not admit the tracking attractor solution. The "tachyonic" stability of the system at/near the attractors as well as the quantum stabiltiy have been studied.
Reconstructing the Equation of State of Tachyon
Jian-gang Hao,Xin-zhou Li
Physics , 2002, DOI: 10.1103/PhysRevD.66.087301
Abstract: Recent progress in theoretical physics suggests that the dark energy in the universe might be resulted from the rolling tachyon field of string theory. Measurements to SNe Ia can be helpful to reconstruct the equation of state of the rolling tachyon which is a possible candidate of dark energy. We present a numerical analysis for the evolution of the equation of state of the rolling tachyon and derive the reconstruction equations for the equation of state as well as the potential.
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