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36 citations found for Fang, N.
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The title inorganic-organic hybrid complex, [CdBr2(C10H8N2)]n, features two-dimensional [CdBr2(4,4'-bipy)]n (4,4'-bipy is 4,4'-bipyridine) neutral networks, based on the octahedral Cd atom coordinated by four
2-Br and two
2-4,4'-bipy at trans positions, yielding a CdBr4N2 octahedron. It crystallizes in the orthorhombic system (Cmmm). All the crystallographically independent atoms are on special positions, namely Cd on mmm, Br on mm, N on mm2, and C on sites of symmetry m or mm2. Optical absorption spectroscopy reveals the presence of an optical gap of 3.76 eV, indicating that the complex is a wide-gap semiconductor. Photoluminescence investigation reveals that the complex displays strong colour-tunable emissions, which might originate from a ligand-to-ligand charge-transfer (LLCT) transition. Thermogravimetric differential thermal analysis shows that the complex is thermally stable up to 493 K.
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The title compound, (C10H10N2)[CdBr4], was synthesized via a hydrothermal reaction. Its structure features discrete 4,4′-bipyridinium cations and tetrahedral [CdBr4]2− anions linked into ion pairs by single N—H
Br hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong emission in the blue region, which may originate from π → π* charge-transfer interactions of the 4,4′-bipyridinium cations.
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The Cd atom in the title complex, [Cd(NO3)2(C15H13N5)]·H2O or [Cd(NO3)2(tpdaH2)]·H2O (tpdaH2 is tripyridyldiamine), has a pentagonal-bipyramidal coordination formed by the tridentate tpdaH2 ligand and two chelate nitrate groups. The tpdaH2 ligand is mer-coordinated, with the N atom of the central pyridine ring in the equatorial position [Cd-N = 2.3148 (17) Å] and the N atoms of the peripheral pyridine rings in the axial positions [Cd-N = 2.2345 (19) and 2.2351 (19) Å, and N-Cd-N = 169.39 (6)°]. The remaining four equatorial positions are occupied by the four O atoms of two nitrate groups, one of which has almost equal Cd-O bond lengths [2.431 (2) and 2.4644 (19) Å], whereas the other shows a significant difference between the Cd-O bond lengths [2.441 (2) and 2.603 (2) Å]. The H atoms of both NH groups of the tpdaH2 ligand are involved in hydrogen bonds with water O atoms as acceptors, whereas both water H atoms form hydrogen bonds with the O atoms of one of the nitrate groups. The hydrogen bonds link the molecules of the title complex and solvent molecules into an infinite three-dimensional network.
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The title compound, C20H14Cl2N2O2, was prepared by the one-step condensation of o-phenylenediamine with 5-chloro-2-hydroxybenzaldehyde. The dihedral angles between the benzimidaloe ring system and the benzene rings are 77.2 (2) and 87.1 (2)° Molecules are linked by O—H
N intermolecular hydrogen bonds, forming one-dimensional infinite chains, and the chains are linked by C—Cl
π(Ar) interactions, forming a two-dimensional network.
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The title compound, C17H18N4O2S·C2H5OH, has been synthesized by the reaction of thiocarbohydrazide with 2-methoxybenzaldehyde in ethanol. The two aromatic rings are not coplanar, making an angle of 34.8 (2)°. Strong intermolecular (N—H
O and O—H
N) and weak intermolecular hydrogen bonds (N—H
S and C—H
O) are found in the crystal structure. These hydrogen bonds link the molecules of the Schiff base and ethanol molecules into an infinite chain. Aromatic stacking interactions are also found in the crystal structure.
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The title compound, [Sn(C6H5)3(C19H16N3O3)], is a four-coordinate SnIV complex, with a distorted tetrahedral geometry and one disordered (0.54:0.46) phenyl ring. The Schiff base carboxylate group acts as a monodentate ligand coordinating through the deprotonated hydroxyl O atom. In the crystal structure, a weak offset face-to-face aromatic π–π stacking interaction can be found between the pyrazole ring and the benzene ring of 4-formylbenzoic acid. The centroid-to-centroid distance is 3.858 (2) Å and the interplanar distance is 3.375 (4) Å.
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Bis{μ-N-[bis(hydroxymethyl)(oxidomethyl)methyl]glycinato}bis[dimethyltin(IV)] dioxane hemisolvate
The title complex, [Sn2(CH3)4(C6H11NO5)2]·0.5C4H8O2, comprises the centrosymmetric cyclic dimeric SnIV complex and an uncoordinated, partially occupied, centrosymmetric dioxane molecule. Each SnIV atom has a distorted octahedral six-coordinate configuration formed by the tridentate tricine ligand, one bridging O atom and two methyl groups. Within the cyclic dimer, the Sn
Sn separation is 3.6574 (4) Å. All H atoms of the NH and OH groups are involved in intermolecular hydrogen bonds with the O atoms as acceptors. There are also important weak intermolecular C—H
O hydrogen bonds, which link the molecules of the dimer and dioxane into an infinite three-dimensional network.
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The title triazole compound, C15H8Cl4N4S·C3H7NO, has been obtained as an unexpected product when attempting to prepare Schiff bases of thiocarbohydrazide (TCH). The triazole ring is planar within 0.004 (8) Å because of conjugation. The dihedral angles between the 1,2,4-triazole ring and the two benzene rings are 24.9 (2) and 70.0 (2)°. The interplanar angle between the two benzene rings is 83.4 (2)°. The packing of the molecules is stabilized both by van der Waals interactions and by N—H
O intermolecular hydrogen bonds between the triazole N atom and the carbonyl O atom of the dimethylformamide solvent molecule.
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In the title compound, [Sn(CH3)2(C15H12N4O2S)], there are two independent molecules in the asymmetric unit which have almost identical geometries. It is a pentacoordinated SnIV complex, with distorted trigonal–bipyramidal geometry. 1,5-Bis(2-hydroxybenzylidene)thiocarbonohydrazide acts as a tridentate ligand, coordinating through the deprotonated phenolate O atom, imino N atom and thiolate S atom. Strong intermolecular N—H
N hydrogen bonds lead to the formation of dimers; the dimers are held together by van der Waals forces.
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The asymmetric unit of the unexpected title compound, 2,2,6,6-tetra-n-butyl-2,6-dichloro-4,8-bis{[(1E)-4-methoxybenzylidene]hydrazino}-1,5-diaza-2,6-distanna-3,7-dithiabicyclo[3.3.0]octa-3,7-diene bis{1,5[(1E)-4-methoxybenzylidene]thiocarbonohydrazide} ethanol disolvate, [Sn2(C4H9)4Cl2(C18H18N6O2S2)]·2C17H18N4O2S·2C2H5OH, comprises one half-molecule of the organotin complex, one thiocarbonohydrazide molecule and one ethanol solvent molecule, and is the first example of a substituted C2N2S2Sn2 planar dicyclo–organotin complex. Each SnIV atom is pentacoordinated with a distorted trigonal–bipyramidal geometry and the complex is disposed across a crystallographic centre of inversion. Weak intermolecular N—H
Cl and C—H
Cl hydrogen bonds and weak S
S interactions link the molecules of the organotin complex into one-dimensional infinite chains.
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The title complex, [Sn(C6H5)3(C14H9N2O2)(H2O)]·C4H8O2, is composed of a triphenyltin carboxylate with a coordinated water molecule and a free dioxane molecule. The SnIV atom is five-coordinate and has a trans-C3SnO2 trigonal–bipyramidal geometry, with the three phenyl groups occupying the equatorial plane, the 4-(1H-benzimidazol-2-yl)benzoate ligand coordinating in a monodentate manner and a water molecule in the axial positions. Strong intermolecular O—H
O and N—H
O hydrogen bonds link the molecules into an infinite two-dimensional network, with these networks held together by van der Waals forces to generate a layer structure. π–π Stacking interactions also exist in the crystal structure.
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A heteronuclear ZnII–EuIII complex (systematic name: {6,6′-diethoxy-2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolato-1κ4O1,O1′,O6,O6′:2κ4O1,N,N′,O1′}trinitrato-1κ6O,O′-europium(III)zinc(II)), [EuZn(C20H22N2O4)(NO3)3], with the hexadentate Schiff base compartmental ligand N,N′-bis(3-ethoxysalicylidene)ethylenediamine, has been synthesized and structurally characterized. The Zn and Eu atoms are doubly bridged by two phenolate O atoms provided by the Schiff base ligand. The coordination of Zn is square planar with the donor centers of two imine N atoms and two phenolate O atoms. The Eu center has a decacoordination environment formed by the phenolate O atoms, two ethoxy O atoms and two O atoms from each of the three nitrates. No classical intermolecular hydrogen bonds are found. Some weak C—H
O and O
Zn interactions [O
Zn = 3.193 (4) Å] generate a two-dimensional zigzag sheet.
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The title compound, C20H19N3O4·H2O, has been synthesized by the reaction of 2-(2-formylphenoxy)acetic acid with 4-aminoantipyrine in ethanol. It comprises a 4-aminoantipyrine Schiff base and a water molecule. The dihedral angles made by the pyrazoline ring with the substituted and unsubstituted phenyl rings are 14.8 (2) and 58.1 (2)°, respectively. In the crystal structure, the molecules are held together by intermolecular O—H
O hydrogen bonds and weak C—H
O, intermolecular hydrogen bonds, as well as π–π stacking interactions.
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In the title complex, [CdCl2(C15H13N5)] or [CdCl2(tpdaH2)] (tpdaH2 is tripyridyldiamine), the geometry at the five-coordinate Cd atom is distorted tetragonal pyramidal, with two Cl atoms and the three pyridine N atoms of the tripyridyldiamine molecule. The ligand (tpdaH2) adopts an all-anti form. The observed Cd-N bond lengths are 2.2958 (19), 2.3254 (19) and 2.3067 (19) Å, slightly shorter than those in the Cd2+ complex with di-2-pyridylamine (dpa).
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The title complex, [Ni(C10H8N3O2)2]·CH3OH, is a mononuclear nickel(II) compound containing two di-2-pyridylamine N,N'-dioxide (dpa dioxide) ligands that are nearly perpendicular to each other. The NiII ion of the complex has a distorted octahedral environment with the equatorial plane formed by an N atom from each amine group and two O atoms of one ligand, while the axial positions are occupied by two O atoms of the second ligand. In the solid state, hydrogen-bonding interactions are dominant, with solvent molecules also participating in hydrogen bonding.
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The title compound, [Sn(C6H5)(C8H7O3)2(C4H11Si)], was prepared by the reaction of [(CH3)3SiCH2]SnPhBr2 with CH3OC6H5COOH and spasmolytol in refluxing toluene, and characterized by IR, 1H NMR and elemental analyses. The geometry at the six-coordinate SnIV atom is distorted octahedral with the equatorial plane made up of four O atoms of two carboxylate groups and the axial positions occupied by a phenyl substituent and a trimethylsilylmethyl group.
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In the structure of the title compound, [Sn(C7H4N2O3)2(C4H11Si)2], the geometry at the six-coordinate Sn atom is distorted octahedral with an approximately planar equatorial belt made up of the four O atoms of two carboxylate groups and the axial positions occupied by two trimethylsilylmethyl groups.
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In the title hydroxyurea derivative, C15H14F2N2O2, the dihedral angle between the two benzene rings is 48.64 (19)°. The urea group forms dihedral angles of 48.1 (2) and 79.2 (2)° with the two benzene rings. In the crystal, inversion dimers linked by pairs of N—H
O hydrogen bonds occur, and further N—H
O links lead to chains of molecules.
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