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Ivana Sloufova Miroslav Slouf 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(11):1312-1313
The title complex, [Ag(NO3)(C13H9N)2], is the first complex of silver and acridine to be reported. The silver coordination is distorted trigonal. The N—Ag—N angle involving the N atoms of the acridine ligands is 145.84 (6)°. The nitrate ion coordinates to silver as an asymmetrically chelating bidentate ligand. The crystal structure consists of neutral complex molecules linked into chains by means of attractive π–π interactions among the parallel acridine ligands. 相似文献
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Ibrahim Abdul Razak S. Shanmuga Sundara Raj Hoong‐Kun Fun Ye‐Xiang Tong Zhong‐Lin Lu Bei‐Sheng Kang 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(3):291-292
In the crystal structure of the title compound, [Zn(C4H13N3)2]2[Fe(CN)6]·4H2O, the asymmetric unit is formed by a [Zn(dien)2]2+ cation (dien = diethylenetriamine, NH2CH2CH2NHCH2CH2NH2), water molecules and half of the [Fe(CN)6]4? anion which is related by inversion symmetry through the Fe atom. The geometry around the Zn and Fe atoms is distorted octahedral and octahedral, respectively. Intramolecular O—H?O hydrogen bonds involving the water molecules, and intermolecular O—H?N hydrogen bonds involving the water molecules and the anions, result in an infinite chain. Intramolecular O—H?O and N—H?N, and intermolecular O—H?N, N—H?O and N—H?N hydrogen bonds form a three‐dimensional framework. 相似文献
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Ying Peng Shaofang Lu Daxu Wu Qiangjin Wu Jianquan Huang 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(5):e183-e184
The crystal structure of the title complex, (C8H10N)2(C5H6N)[BiI6], contains discrete [BiI6]3? anions, and (HNC5H5)+ and (CH3COCH2NC5H5)+ cations separated by normal van der Waals contacts. The [BiI6]3? anion has the Bi atom on an inversion centre. The (HNC5H5)+ cation also lies about an inversion centre and is disordered. The (CH3COCH2NC5H5)+ cation lies in a general position. 相似文献
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Hasan budak Ahmet Bulut Naziye etin Canan Kazak 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(1):m1-m3
The crystal structure of the first acesulfame–metal complex, namely tetraaquabis[6‐methyl‐1,2,3‐oxathiazin‐4(3H)‐onato 2,2‐dioxide‐κN]cobalt(II), [Co(C4H4NO4S)2(H2O)4], is reported. The CoII ion resides on a twofold axis and is coordinated by four aqua ligands defining the basal plane and by two monodentate acesulfamate ligands, via their ring N atoms, in the axial positions. Two intra‐ and three intermolecular hydrogen‐bonding interactions stabilize the crystal structure and form an infinite three‐dimensional lattice. 相似文献
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Melanie Rademeyer 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(2):m55-m56
The crystal structure of bis(benzylammonium) hexachlorotin(IV), (C7H7NH3)2[SnCl6], exhibits ionic layers separated by hydrocarbon layers. The hydrocarbon layer contains two crystallographically inequivalent benzyl groups and aromatic π–π stacking interactions are observed in this layer. In the inorganic layer, the ammonium groups interact with isolated tilted [SnCl6]2− octahedra through normal, bifurcated and trifurcated N—H⋯Cl hydrogen bonds. 相似文献
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Teresa Borowiak Grzegorz Dutkiewicz Jarosaw Spychaa 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(3):o201-o203
In both 1‐(2‐cyanoethyl)thymine [systematic name: 3‐(5‐methyl‐2,4‐dioxo‐1,2,3,4‐tetrahydropyrimidin‐1‐yl)propanenitrile], C8H9N3O2, (I), and 1‐(3‐cyanopropyl)thymine [systematic name: 4‐(5‐methyl‐2,4‐dioxo‐1,2,3,4‐tetrahydropyrimidin‐1‐yl)butanenitrile], C9H11N3O2, (II), the core of the supramolecular structure is formed by centrosymmetric dimers generated by N—H⋯O hydrogen bonds. Further weak hydrogen bonds of C—H⋯O and C—H⋯N types generate molecular tapes and sheets that resemble those in uracil and its methyl derivatives. The steric hindrance that arises from the cyanoalkyl substituents perturbs the conformations of the tapes and sheets. 相似文献
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Jan Janczak Genivaldo Julio Perptuo 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(6):o349-o352
The crystal structure of the title melaminium salt, bis(2,4,6‐triamino‐1,3,5‐triazin‐1‐ium) dl ‐malate tetrahydrate, 2C3H7N6+·C4H4O52−·4H2O, consists of singly protonated melaminium residues, dl ‐malate dianions and water molecules. The melaminium residues are connected into chains by four N—H⃛N hydrogen bonds, and these chains form a stacking structure along the c axis. The dl ‐malate dianions form hydrogen‐bonded chains and, together with hydrogen‐bonded water molecules, form a layer parallel to the (100) plane. The conformation of the malate ion is compared with an ab initio molecular‐orbital calculation. The oppositely charged moieties, i.e. the stacks of melaminium chains and hydrogen‐bonded dl ‐malate anions and water molecules, form a three‐dimensional polymeric structure, in which N—H⃛O hydrogen bonds stabilize the stacking. 相似文献
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Shu‐Fang Zhang Yan‐Qiong Sun Guo‐Yu Yang 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(7):m299-m301
The title compound, {(C12H13N2)2[Mo5O16]}n, was synthesized under hydrothermal conditions. The structure contains a two‐dimensional layer, constructed from [(Mo4O14)n]4n− chains linked through MoO6 octahedra, which lie across twofold axes. The [(Mo4O14)n]4n− chain consists of [Mo4O14]4− clusters connected to one another by sharing their MoO5 square‐pyramidal and MoO6 octahedral vertices in an anti disposition. The layers are linked by the cation, to which they are connected via N—H⋯O hydrogen bonds. 相似文献
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Kenneth W. Muir David G. Morris Karl S. Ryder Anastassios Varvoglis 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(7):o376-o377
The title disulfonyl‐stabilized pyridinium ylide, C5H5N+–C−(SO2C6H5)2 or C18H15NO4S2, contains a near planar NCS2 core. The structure suggests that the formal negative charge of the ylide C atom is delocalized to the S atoms rather than the N atom. Structural features of pyridinium ylides are briefly discussed. 相似文献
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Yang‐Yi Yang Xiao‐Ming Chen Seik Weng Ng 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(3):e111-e112
In the asymmetric unit of the title compound, 2C12H24N+·C6H8O42?·H2O, the carboxylate ion lies about an inversion center, the water molecule is on a twofold axis and the sec‐ammonium cation is in a general position. Cations link the oxygen ends of two adjacent carboxylate anions to form an eight‐membered ring [N?O 2.683 (3) and 2.711 (3) Å]. The ion pair propagates as a linear chain and adjacent chains are linked through the water molecules [O?O 2.966 (3) Å] into layers. 相似文献
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S. Kannan Anwar Usman Hoong‐Kun Fun 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(5):o268-o270
The title compound, meso‐C13H12O2S2, is in an anti conformation, with R and S configurations around the S atoms. The two O atoms are trans to each other, and the same applies for the two benzene rings. The phenylsulfinyl groups are nearly orthogonal to the central dithiomethane group, and the orientation of the two phenyl rings are determined by the interactions in which they are involved. The packing is built from molecular columns stabilized by weak C—H⋯O interactions. 相似文献
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Abdul Hamid Othman Yang‐Yi Yang Xiao‐Ming Chen Seik Weng Ng 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):e318-e319
The three‐coordinate Ag atom in the title compound, [Ag(C7H3N2O6)(C18H15P)2], shows trigonal–planar coordination [P—Ag—P = 147.1 (1)° and ΣAg = 359.0 (3)°]. Adjacent molecules are linked through the O atoms of adjacent nitro groups [Ag?O = 3.205 (3) and 3.302 (4) Å] into a zigzag chain running parallel to the c axis. 相似文献
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Pance Naumov Mirjana Ristova Michael G. B. Drew Seik Weng Ng 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(9):e372-e373
In the title compound, [Ni(C2H3O)2(C3H4N2)4], the Ni atom is coordinated centrosymmetrically by four N and two O atoms in an octahedral coordination [Ni—N = 1.986 (3) and 2.054 (3) Å; Ni—O = 2.697 (3) Å]. The O atoms of the acetate anions form hydrogen bonds to adjacent imidazole moieties, with the free O atom forming a somewhat shorter bond [N?O = 2.679 (3) and 2.870 (4) Å]. The hydrogen bonds give rise to a two‐dimensional layer structure. 相似文献
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Dingming Wu Sheng Wang Xiang Lin Canzhong Lu Honghui Zhuang 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(2):e55-e56
The six Mo atoms in the title compound, (C4H12N)2[Mo6O19].H2O, form a standard octahedral cage through bridging O atoms. The [Mo6O19]2? anion as a whole has Oh symmetry with three crystallographic fourfold axes aligned along Mo—O—Mo. There exist weak O?O hydrogen bonds (O100?O3 2.951 Å) between the terminal O3 atoms of the anions and O100 atoms of the solvate hydrates in the unit cell. 相似文献
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Veysel T. Yilmaz Ahmet Karadag Carsten Thne Regine Herbst‐Irmer 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):948-949
In the neutral title complex, trans‐bis(2,2′‐iminodiethanol‐N,O)bis(isothiocyanato)nickel(II), [Ni(NCS)2(C4H11NO2)2], the isothiocyanate ions and the diethanolamine molecules act as monodentate and bidentate ligands, respectively. The NiII ion exhibits a distorted octahedral configuration with crystallographically imposed inversion symmetry and NNCS—Ni—Namine and NNCS—Ni—Oamine bond angles of 88.78 (10) and 89.44 (10)°, respectively. The Ni—N bond distances are in the range 2.069 (3)–2.096 (2) Å. The molecules are linked by hydrogen bonds to form a three‐dimensional infinite lattice. 相似文献
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Daniel Raucher Arieh Demiel Moshe Levy David Vofsi 《Journal of polymer science. Part A, Polymer chemistry》1979,17(9):2825-2832
The initiator system AgNO3–tetraethyl lead was used for the polymerization of vinyl fluoride. Dimethyl sulfoxide was found to have a specific effect on the half-life of the initiating system, which leads to long reaction times and high conversions at ambient temperatures. This effect was explained by the complexing power of DMSO on silver ions, which slows down the rate of formation of AgEt and permits the polymerization to proceed for longer periods than in other solvents. The kinetics of the polymerization agreed with the scheme developed earlier. Tetraethyl lead acts as a powerful chain transfer agent and determines to a large extent the resulting polymers. 相似文献
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B. de Castro C. Freire M. Teresa Duarte M. F. Minas da Piedade I. C. Santos 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(4):370-372
In the title complex, trans‐{2,2′‐[cyclohexane‐1,2‐diylbis(nitrilomethylidyne)]diphenolato‐κ4O,N,N′,O′}nickel(II)–chloroform (1/1), [Ni(C20H20N2O2)]·CHCl3, the Ni atom has a square‐planar geometry, slightly tetrahedrally distorted. The Ni—N and Ni—O bonding distances are within the expected ranges for Ni–Schiff base derivatives. The diimine bridge has a gauche conformation with the cyclohexyl ring almost coplanar with the NiN2O2 plane. The complex molecules pack in dimers with an Ni?Ni distance of 3.59 (1) Å and form a three‐dimensional structure displaying a herring‐bone configuration. Channels are occupied by solvent molecules, which are involved in C—H?O hydrogen bonds with the ligand O atoms. 相似文献
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Dianne D. Ellis Anthony L. Spek 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):e547-e548
In the title compound, [Ag{P(C6H5)}4][B{P(C6H5)}4]·CH3CN, the Ag ion resides on a crystallographic twofold rotation axis and is tetrahedrally coordinated. There is a disparity between the two independent Ag—P distances. This is due, in part, to the temperature differences (all previous determinations are at room temperature) but also to the packing effects of various anions. 相似文献