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Search Results: 1 - 10 of 180072 matches for " Da-Qi Wang "
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N-[4-(Dimethylamino)benzylidene]-4-ethoxyaniline
Qiang Wang,Da-Qi Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807062277
Abstract: In the title compound, C17H20N2O, the molecular core is planar, with a central C—N=C—C torsion angle of 179.3 (3)°. However, the overall geometry is not planar, with a dihedral angle of 61.96 (1)° between the two benzene rings, which adopt a trans configuration with respect to the C=N bond [1.269 (4) ]. The bond lengths and angles are within normal ranges
Aquabis(o-vanillinato-κ2O,O′)nickel(II)
Qiang Wang,Da-Qi Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807068183
Abstract: The NiII atom in the title complex, aquabis(2-formyl-6-methoxyphenolato-κ2O,O′)nickel(II), [Ni(C8H7O3)2(H2O)], is five-coordinated by four O atoms from two o-vanillinate ligands and one water molecule in a slightly distorted square-pyramidal geometry (τ = 0.06). In the crystal structure, the molecules are linked into dimers by intermolecular O—H...O hydrogen bonds.
Bis(acetato-κ2O,O′)bis(2-aminopyridine-κN)nickel(II)
Qiang Wang,Da-Qi Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536807066226
Abstract: The title complex, [Ni(C2H3O2)2(C5H6N2)2], has a distorted octahedral geometry around the Ni atom. Intermolecular and intramolecular N—H...O hydrogen bonds exist in the crystal structure.
Bis[aqua(2,3-naphtho-15-crown-5)sodium] tetrakis(thiocyanato-κN)cobaltate(II)
Chengjuan Li,Da-Cheng Li,Da-Qi Wang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809038641
Abstract: The title complex, [Na(C18H22O5)(H2O)]2[Co(NCS)4], consists of two aqua(2,3-naphtho-15-crown-5)sodium complex cations and one [Co(NCS)4]2 complex anion, which has crystallographic overline 1 symmetry. In the anion, the CoII centre is coordinated by the N atoms of four NCS ligands in a distorted tetrahedral geometry. In the complex cations, the NaI centre is coordinated by five O atoms of the 2,3-naphtho-15-crown-5 ligand and one water O atom. The complex molecules form a two-dimensional network via weak O—H...S interactions between adjacent cations and anions
Poly[[diaqua(μ4-l-tartrato)(μ2-l-tartrato)dizinc(II)] tetrahydrate]
Hou-Ting Liu,Jing Lu,Da-Qi Wang
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810007543
Abstract: In the title compound, {[Zn(C4H4O6)(H2O)]·2H2O}n, the l-tartrate ligands adopt μ4- and μ2-coordination modes. The ZnII atom adopts an octahedral geometry and is chelated by two kinds of l-tartrate ligands through the hydroxy and carboxylate groups and coordinated by one unchelating carboxylate O atom and one water molecule. In the crystal, the l-tartrate ligands link the ZnII atoms, forming a two-dimensional coordination layer; these layers are futher linked into a three-dimensional supramolecular network by O—H...O hydrogen bonds between the two-dimensional coordination layers and the uncoordinated water molecules. The latter are equally disordered over two positions.
7-[4-(5,7-Dimethyl-1,8-naphthyridin-2-yloxy)phenoxy]-2,4-dimethyl-1,8-naphthyridine methanol disolvate
Shou-Wen Jin,Da-Qi Wang,Yun Chen
Acta Crystallographica Section E , 2008, DOI: 10.1107/s160053680706549x
Abstract: The title compound, C26H22N4O2·2CH3OH, was synthesized and characterized by 1H NMR spectroscopy and X-ray structure analysis. There is one half-molecule in the asymmetric unit with a centre of symmetry located at the centre of the benzene ring. The two bridged naphthyridine ring systems are in an antiparallel orientation. In the crystal structure, O—H...N, C—H...O and C—H...N interactions define the packing.
Dichloridooctakis(2-chlorobenzyl)di-μ2-hydroxido-di-μ3-oxido-tetratin(IV)
Qi-Jun Zhang,Han-Dong Yin,Li-Yuan Wen,Da-Qi Wang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809045176
Abstract: The title tetranuclear SnIV compound, [Sn4(C7H6Cl)8Cl2O2(OH)2], has site symmetry overline{1}. Two O2 and two OH anions bridge four SnIV cations to form the tetranuclear compound. The two independent SnIV cations assume SnO3C2 and SnO2C2Cl distorted trigonal-bipyramidal coordination geometries. Intramolecular O—H...Cl hydrogen bonding is present in the structure. One Cl atom of a chlorobenzyl ligand is disordered over two sites with an occupancy ratio of 0.693 (2):0.307 (2).
Di-μ-chlorido-bis[chlorido(N,N′-dibenzylpropane-1,2-diamine-κ2N,N′)copper(II)]
Yu-Fen Liu,Da-Fu Rong,Hai-Tao Xia,Da-Qi Wang
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809044997
Abstract: In the title complex, [Cu2Cl4(C17H22N2)2], the CuII cation is coordinated by a N,N′-dibenzylpropane-1,2-diamine ligand and two Cl anions, and a Cl anion from an adjacent molecule further bridges to the CuII cation in the apical position, with a longer Cu—Cl distance of 2.9858 (18) , forming a centrosymmetric dimeric complex in which each CuII cation is in a distorted square-pyramidal geometry. Intramolecular N—H...Cl hydrogen bonding is observed in the dimeric complex.
5-Hydroxy-1-(3-hydroxy-2-naphthoyl)-3,5-dimethyl-2-pyrazoline
Yuting Chen,Da-Cheng Li,Yuehua Zhu,Da-Qi Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808023027
Abstract: In the title molecule, C16H16N2O3, intramolecular O—H...O hydrogen bonds influence the molecular conformation. Intermolecular O—H...O hydrogen bonds [O...O = 2.922 (2) ] link the molecules into centrosymmetric dimers. Weak intermolecular C—H...O interactions assemble these dimers into layers parallel to the bc plane.
[3-Hydroxy-N′-(2-oxidobenzylidene)-2-naphthohydrazidato-κ3O,N,O′]tris(pyridine-κN)nickel(II) pyridine trisolvate
Shi-Zhu Sun,Wen-Jun Kang,Da-Cheng Li,Da-Qi Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808002900
Abstract: The asymmetric unit of the crystal structure of the title complex, [Ni(C18H12N2O3)(C5H5N)3]·3C5H5N, contains two independent NiII complex molecules and six uncoordinated pyridine molecules. Each NiII atom is coordinated by two O and four N atoms, from three pyridine and a chelating 3-hydroxy-N′-(2-oxidobenzylidene)-2-naphthohydrazide dianionic ligand, with a distorted octahedral geometry. Intramolecular O—H...N hydrogen bonding exists in both complex molecules but no intermolecular hydrogen bonding is observed in the crystal structure.
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