共查询到20条相似文献,搜索用时 15 毫秒
1.
Norman Lu Wen‐Han Tu Zong‐Wei Wu Yuh‐Sheng Wen Ling‐Kang Liu 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(6):o289-o291
As part of a homologous series of novel polyfluorinated bipyridyl (bpy) ligands, the title compound, C16H14F6N2O2, contains the smallest fluorinated group, viz. CF3. The molecule resides on a crystallographic inversion centre at the mid‐point of the pyridine Cipso—Cipso bond. Therefore, the bpy skeleton lies in an anti conformation to avoid repulsion between the two pyridyl N atoms. Weak intramolecular C—H...N and C—H...O interactions are observed, similar to those in related polyfluorinated bpy–metal complexes. A π–π interaction is observed between the bpy rings of adjacent molecules and this is probably a primary driving force in crystallization. Weak intermolecular C—H...N hydrogen bonding is present between one of the CF3CH2– methylene H atoms and a pyridyl N atom related by translation along the [010] direction, in addition to weak benzyl‐type C—H...F interactions to atoms of the terminal CF3 group. It is of note that the O—CH2CF3 bond is almost perpendicular to the bpy plane. 相似文献
2.
Mark A. Rodriguez Charles F. Campana A. David Rae Edward Graeber Bruno Morosin 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(3):o127-o130
The crystal structure of form III of the title compound, HNAB [systematic name: bis(2,4,6‐trinitrophenyl)diazene], C12H4N8O12, has finally been solved as a pseudo‐merohedral twin (monoclinic space group P21, rather than the orthorhombic space group C2221 suggested by diffraction symmetry) using a dual space recycling method. The significant differences in the room‐temperature densities of the three crystalline forms allow examination of molecular differences due to packing arrangements. An interesting relationship with the stilbene analog, HNS, is discussed. Interatomic separations are compared with other explosives and/or nitro‐containing compounds. 相似文献
3.
Vijay Mahadevan Iyer Helen Stoeckli‐Evans Anthony D'Alo Luisa De Cola Peter Belser 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(4):o259-o261
Structure analyses of 4,4′‐bis(4‐hydroxybutyl)‐2,2′‐bipyridine, C18H24N2O2, (I), and 4,4′‐bis(4‐bromobutyl)‐2,2′‐bipyridine, C18H22Br2N2, (II), reveal intermolecular hydrogen bonding in both compounds. For (I), O—H·N intermolecular hydrogen bonding leads to the formation of an infinite two‐dimensional polymer, and π stacking interactions are also observed. For (II), C—H·N intermolecular hydrogen bonding leads to the formation of a zigzag polymer. The two compounds crystallize in different crystal systems, but both molecules possess Ci symmetry, with one half molecule in the asymmetric unit. 相似文献
4.
Masako Kato Mana Ikemori 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(1):m25-m26
The title compound, [PtCl2(C28H44N2)], is a new square‐planar PtII complex containing a bipyridine moiety with two long alkyl‐chain substituents. The complex forms a segregated packing structure made up of the alkyl‐chain layers and paired coordination sites. 相似文献
5.
Burkhard Ziemer Lutz Grubert 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(7):e304-e304
The title molecule, C16H22O2, reveals Ci point symmetry in the crystal structure. The structure was disordered. The pyran ring is not planar; the O atom lies significantly out of the least‐squares plane (ten times the r.m.s. deviation of all six atoms). 相似文献
6.
Pablo Albors Luis M. Baraldo Andrs Ibaez Ricardo Baggio 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(12):o850-o852
The title compound, C18H26N4, contains two almost identical independent molecules that lie about inversion centres. Each molecule has a planar bipyridine nucleus and two terminal diethylamine groups oriented at almost right angles to the core. These diethylamine branches act as spacers, producing a very open structure with one of the lowest densities reported among related compounds. The most important intermolecular interactions are of the C—H⋯π type, which connect non‐equivalent moieties. 相似文献
7.
Jia‐Geng Liu Jing‐Jing Nie Duan‐Jun Xu Yuan‐Zhi Xu Jing‐Yun Wu Michael Y. Chiang 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(4):354-355
The title complex, [CuCl2(C6H6N4S2)], has a flattened tetrahedral coordination. The CuII atom is located on a twofold rotation axis and is coordinated by two N atoms from a chelating 2,2′‐diamino‐4,4′‐bi‐1,3‐thiazole ligand and by two Cl atoms. Intramolecular hydrogen bonding exists between the amino groups of the 2,2′‐diamino‐4,4′‐bi‐1,3‐thiazole ligand and the Cl atoms. The intermolecular separation of 3.425 (1) Å between parallel bithiazole rings suggests there is a π–π interaction between them. 相似文献
8.
Tareq M. A. Al‐Shboul Steffen Ziemann Helmar Grls Sven Krieck Matthias Westerhausen 《无机化学与普通化学杂志》2019,645(3):292-300
The condensation reaction of 2,2′‐diamino‐4,4′‐dimethyl‐6,6'‐dibromo‐1,1′‐biphenyl with 2‐hydroxybenzaldehyde as well as 5‐methoxy‐, 4‐methoxy‐, and 3‐methoxy‐2‐hydroxybenzaldehyde yields 2,2′‐bis(salicylideneamino)‐4,4′‐dimethyl‐6,6′‐dibromo‐1,1′‐biphenyl ( 1a ) as well as the 5‐, 4‐, and 3‐methoxy‐substituted derivatives 1b , 1c , and 1d , respectively. Deprotonation of substituted 2,2′‐bis(salicylideneamino)‐4,4′‐dimethyl‐1,1′‐biphenyls with diethylzinc yields the corresponding substituted zinc 2,2′‐bis(2‐oxidobenzylideneamino)‐4,4′‐dimethyl‐1,1′‐biphenyls ( 2 ) or zinc 2,2′‐bis(2‐oxidobenzylideneamino)‐4,4′‐dimethyl‐6,6′‐dibromo‐1,1′‐biphenyls ( 3 ). Recrystallization from a mixture of CH2Cl2 and methanol can lead to the formation of methanol adducts. The methanol ligands can either bind as Lewis base to the central zinc atom or as Lewis acid via a weak O–H ··· O hydrogen bridge to a phenoxide moiety. Methanol‐free complexes precipitate as dimers with central Zn2O2 rings. 相似文献
9.
Four organotin complexes with 2,2′‐bipyridine‐4,4′‐dicarboxylic acid, H2dcbp: (Ph3n)2(dcbp) 1 , [(PhCH2)3n]2(dcbp) ⋅ 2CH3OH 2 , [(Me3Sn)2(dcbp)]n 3 , [(Bu3Sn)2(dcbp)]n 4 have been synthesized. The complexes 1–4 were characterized by elemental, IR, 1H, 13C, 119n NMR, and X‐ray crystallographic analyses. Crystal structures show that complex 1 is a monomer with one ligand coordinated to two triorganotin moieties, and a 1D infinite polymeric chain generates via intermolecular C H⋅⋅⋅N hydrogen bond; complex 2 is also a monomer and forms a 2D network by intermolecular O–H⋅⋅⋅O weak interaction; both of complexes 3 and 4 form 2D network structures where 2,2′‐bipyridine‐4,4′‐dicarboxylate acts as a tetradentate ligand coordinated to trimethyltin and tri‐n‐butyltin ions, respectively. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:19–28, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/hc.20506 相似文献
10.
John A. Schlueter Russell J. Funk Urs Geiser 《Acta Crystallographica. Section C, Structural Chemistry》2005,61(6):m304-m306
In the title compound, (C10H9N2)2[Pt(CN)6]·2C10H8N2 or [(Hbpy)+]2[Pt(CN)6]2−·2bpy, where bpy is 4,4′‐bipyridine, the Hbpy+ cations and bpy molecules form a hydrogen‐bonded two‐dimensional cationic approximately square grid parallel to the (110) plane. The [Pt(CN)6]2− dianions reside in the cavities within this grid, with the nitrile N atoms forming weak hydrogen bonds with the CH groups in the cationic lattice. 相似文献
11.
Oleg Stenzel Matthias W. Esterhuysen Helgard G. Raubenheimer 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(9):1056-1059
The crystal and molecular structures of bis(η5‐2,4,7‐trimethylindenyl)cobalt(II), [Co(C12H13)2], (I), and rac‐2,2′,4,4′,7,7′‐hexamethyl‐1,1′‐biindene, C24H26, (II), are reported. In the crystal structure of (I), the Co atom lies on an inversion centre and the structure represents the first example of a bis(indenyl)cobalt complex exhibiting an eclipsed indenyl conformation. The (1R,1′R) and (1S,1′S) enantiomers of the three possible stereoisomers of (II), which form as by‐products in the synthesis of (I), cocrystallize in the monoclinic space group P21/c. In the unit cell of (II), alternating (1R,1′R) and (1S,1′S) enantiomers pack in non‐bonded rows along the a axis, with the planes of the indenyl groups parallel to each other and separated by 3.62 and 3.69 Å. 相似文献
12.
Dharmalingam Sivanesan Hyung Min Kim Yoon Sungho 《Acta Crystallographica. Section C, Structural Chemistry》2013,69(6):584-587
The title complex, [Rh(C10H15)Cl(C14H12N2O4)]Cl·2C4H5NO3, has been synthesized by a substitution reaction of the precursor [bis(2,5‐dioxopyrrolidin‐1‐yl) 2,2′‐bipyridine‐4,4′‐dicarboxylate]chlorido(pentamethylcyclopentadienyl)rhodium(III) chloride with NaOCH3. The RhIII cation is located in an RhC5N2Cl eight‐coordinated environment. In the crystal, 1‐hydroxypyrrolidine‐2,5‐dione (NHS) solvent molecules form strong hydrogen bonds with the Cl− counter‐anions in the lattice and weak hydrogen bonds with the pentamethylcyclopentadienyl (Cp*) ligands. Hydrogen bonding between the Cp* ligands, the NHS solvent molecules and the Cl− counter‐anions form links in a V‐shaped chain of RhIII complex cations along the c axis. Weak hydrogen bonds between the dimethyl 2,2′‐bipyridine‐4,4′‐dicarboxylate ligands and the Cl− counter‐anions connect the components into a supramolecular three‐dimensional network. The synthetic route to the dimethyl 2,2′‐bipyridine‐4,4′‐dicarboxylate‐containing rhodium complex from the [bis(2,5‐dioxopyrrolidin‐1‐yl) 2,2′‐bipyridine‐4,4′‐dicarboxylate]rhodium(III) precursor may be applied to link Rh catalysts to the surface of electrodes. 相似文献
13.
David G. Billing Cedric W. Holzapfel Kevin Blann D. Bradley G. Williams 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(11):e522-e523
The crystal structure of the title compound, C20H18O4, contains a crystallographic inversion center. The C—C bond linking the two halves of the molecule is slightly elongated at 1.577 (3) Å. 相似文献
14.
Hans‐Ruedi Mürner Rosario Scopelliti Jean‐Claude G. Bünzli 《Acta Crystallographica. Section C, Structural Chemistry》2002,58(8):m434-m435
In the title compound, [TbCl(C27H35N3)2(H2O)](ClO4)2·2C2H6O, the TbIII ion has a coordination number of eight, composed of two tridentate substituted‐terpyridine ligands, a water molecule and a bound Cl? anion. The first coordination shell can be described as a distorted bicapped trigonal prism. The dihedral angles between pyridine rings belonging to the same tpy ligand range from 5.2 (5) to 16.8 (5)°. 相似文献
15.
Nathan W. Polaske Gary S. Nichol Bogdan Olenyuk 《Acta Crystallographica. Section C, Structural Chemistry》2009,65(8):o381-o384
A crystallographic investigation of the title compound, C22H28Cl2N4O4, using crystals obtained under different crystallization conditions, revealed the presence of two distinct polymorphic forms. The molecular conformation in the two polymorphs is very different: one adopts a `C' shape, whereas the other adopts an `S' shape. In the latter, the molecule lies across a crystallographic twofold axis. The `S'‐shaped polymorph undergoes a reversible orthorhombic‐to‐monoclinic phase transition on cooling, whereas the structure of the `C'‐shaped polymorph is temperature insensitive. 相似文献
16.
Koji Kubono Kunihiko Yokoi 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(9):o535-o537
The title compound, C18H18Cl4N2O2, crystallizes as monoclinic and orthorhombic polymorphs from CHCl3–CH3OH solution. In both polymorphic forms, the molecule lies on a crystallographic centre of inversion (at the piperazine ring centroid) and exhibits an intramolecular O—H...N hydrogen bond. In the monoclinic polymorph (space group P21/c), the molecules are linked by intermolecular C—H...Cl hydrogen bonds into a ribbon sheet built from R88(34) rings. In the orthorhombic polymorph (space group Pbcn), the molecules are linked by intermolecular C—H...O hydrogen bonds into a ribbon sheet of R66(34) rings. The sheets in the orthorhombic polymorph are crosslinked into a three‐dimensional framework by π–π stacking interactions. 相似文献
17.
18.
Su‐Ping Zhou Xu‐Xian Wu Chao Zu Zi‐Lu Chen Fu‐Pei Liang 《Acta Crystallographica. Section C, Structural Chemistry》2010,66(2):m26-m28
The PbII cation in the title compound, [Pb2(C14H4N2O8)]n, is seven‐coordinated by one N atom and six O atoms from four 4,4′‐bipyridine‐2,2′,6,6′‐tetracarboxylate (BPTCA4−) ligands. The geometric centre of the BPTCA4− anion lies on an inversion centre. Each pyridine‐2,6‐dicarboxylate moiety of the BPTCA4− ligand links four PbII cations via its pyridyl N atom and two carboxylate groups to form two‐dimensional sheets. The centrosymmetric BPTCA4− ligand then acts as a linker between the sheets, which results in a three‐dimensional metal–organic framework. 相似文献
19.
Francesco Paolo Invidiata Stefania Aiello Giancarlo Furno' Enrico Aiello Daniele Simoni Riccardo Rondanin 《Journal of heterocyclic chemistry》2000,37(2):355-361
Thermal rearrangement of 3‐acylisoxazole arylhydrazones allowed facile preparation of 2H‐1,2,3‐triazoles which were firstly reacted with isoamyl nitrite and then with an opportune arylhydrazine to produce the corresponding α‐hydroxyiminohydrazones 8a‐h . The reaction of compounds 8a‐h with phosphorus pentachloride afforded the desired 4,4′‐bitriazoles 1a‐h . The α‐hydroxyiminoketone derivative 7 or the α‐diketone 14 reacted easily with 1,2‐phenylenediamine to afford 1,2,3‐triazoles 2a‐c bearing the quinoxaline moiety at position 4. Improved yields of the quinoxalines 2a‐c were obtained when 1,2‐phenylenediamine was reacted with the dioxime 15. 相似文献
20.
Guibin Ma Andrey Ilyukhin Julius Glaser 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(12):1473-1475
The title compound, [H2bipy](ClO4)2 or C10H10N22+·2ClO4?, was obtained at the interface between an organic (2,2′‐bipyridine in methanol) and an aqueous phase (perchloric acid in water). The compound crystallizes in space group P and comprises discrete diprotonated trans‐bipyridinium cations, [H2bipy]2+, and ClO4? anions. The cations and anions are connected through N—H?O and C—H?O hydrogen bonds [distances N?O 2.817 (4) and 2.852 (4) Å, and C?O 3.225 (6)–3.412 (5)Å]. The C—C bond distance between the two rings is 1.452 (5) Å. The bipyridinium cation has a trans conformation and the N—C—C—N torsion angle is 152.0 (3)°. 相似文献