共查询到20条相似文献,搜索用时 15 毫秒
1.
Mustafa OdabasÛoglu igdem Albayrak Orhan Büyükgüngr Helmut Goesmann 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(5):o234-o236
The title compound, C17H18ClN3O4, adopts the keto–amine tautomeric form and displays an intramolecular N—H⋯O hydrogen bond [N⋯O = 2.639 (2) Å]. The configuration around the azo N=N double bond is trans, and the dihedral angle between the planes of the two aromatic rings is 20.5 (2)°. The molecules are linked by O—H⋯O hydrogen bonds to form a three‐dimensional network. 相似文献
2.
Cem Cüneyt Ersanl idem Albayrak Mustafa Odabaolu Carsten Thne Ahmet Erdnmez 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(2):o133-o135
The structure of the title compound, C18H20ClN3O5, displays the characteristic features of azobenzene derivatives. Intramolecular N—H⋯O, weak intramolecular C—H⋯O, and intermolecular O—H⋯O and C—H⋯O interactions influence the conformation of the molecules and the crystal packing. Intermolecular hydrogen bonds link the molecules into infinite chains, and the title compound adopts the keto–amine tautomeric form. The azobenzene moiety of the molecule has a trans configuration. The molecule is not planar, and the dihedral angle between the two phenyl rings is 35.6 (2)°. 相似文献
3.
Baak Koar Orhan Büyükgüngr idem Albayrak Mustafa Odabaolu 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(6):o458-o460
The title compounds, both C13H11NO3, exist as the keto–amine tautomers, and the formal hydroxyl H atoms, which display strong intramolecular hydrogen bonds, are located on the N atoms. This is a verification of the preference for the keto–amine tautomeric form in the solid state. The 2‐hydroxy isomer has two independent molecules, with the molecules linked by intramolecular N—H⋯O and O—H⋯O and intermolecular O—H⋯O hydrogen bonds into three‐dimensional networks. 相似文献
4.
T. S. Basu Baul S. Dhar E. R. T. Tiekink 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(10):1280-1281
The title compound, C14H12N2O4, shows an E conformation about the diazenyl N atoms. The crystal structure features layers of molecules with the primary connection between the layers afforded by carboxylic acid dimer motifs; no evidence for extensive π–π stacking between the layers was found. 相似文献
5.
igdem Albayrak Mustafa Odabaolu Orhan Büyükgüngr Peter Lnnecke 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(5):o318-o320
The molecule of the former title compound, C13H9ClN2O2, (I), is nearly planar, with an intramolecular O⋯O hydrogen bond of 2.692 (2) Å. The latter title compound, C17H18ClN3O4, (II), exists in the keto–amine tautomeric form, with a strong intramolecular hydrogen bond of 2.640 (2) Å between the O and N atoms, the H atom being bonded to the N atom. The azobenzene moieties of both molecules have trans configurations, and the dihedral angle between the planes of the two aromatic rings is 4.1 (1)° in (I) and 9.9 (1)° in (II). The N—H⋯O hydrogen‐bonded rings are almost planar and coupled with the cyclohexadiene rings in (II). 相似文献
6.
Francine Blanger‐Garipy Michle Dartiguenave Frdrique Loiseau Andr L. Beauchamp 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):e338-e339
Pairs of individual molecules of the title compound, C19H17O2P, (I), containing tetrahedrally coordinated P atoms are connected across crystallographic inversion centres via complementary O—H?O=P hydrogen bonds. 相似文献
7.
Benjamin J. Coe James A. Harris Simon J. Coles Michael B. Hursthouse 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(7):857-858
In the title compound, C15H18N3+·C7H7O3S?, the phenylene and pyridyl rings are somewhat twisted with respect to each other, forming a dihedral angle of 23.49 (6)°. The compound contains a dipolar chromophoric cation, but crystallizes in the centrosymmetric space group P21/n and is thus not expected to display quadratic non‐linear optical effects. 相似文献
8.
Danitza Vargas Ivn Brito Andrea Reyes Alejandro Crdenas Matías Lpez‐Rodríguez 《Acta Crystallographica. Section C, Structural Chemistry》2007,63(1):o48-o50
The structure of title compound, C6H16N+·C14H8N3O7S−, comprises discrete ions which are interconnected by N—H⋯O− and N—H+⋯O− hydrogen bonds, leading to a neutral one‐dimensional network along [100]. These hydrogen bonds appear to complement the Coulombic interaction and help to stabilize the structure further. 相似文献
9.
Viktor Kettmann Jan Lokaj Viktor Milata Milan Marko Magdalna tvrteck 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(4):o252-o254
In the title compound, C13H13NO2, there is polarization of π‐electron density from the amine N atom to the acceptor carbonyl groups: as a result, the molecule exists predominantly in an azomethino‐1,3‐diketone tautomeric form. There is crystallographic evidence that the phenyl ring, although roughly coplanar with the rest of the molecule, is deconjugated with the adjacent π system of the molecule. The cyclohexane ring adopts an unsymmetrical half‐chair conformation and converts between two inversion‐related conformers. The molecule is stabilized by an intramolecular hydrogen bond, while the intermolecular packing is dominated by a number of short C—H⋯O contacts. 相似文献
10.
Jianxing Zhang Shou‐Feng Chen Kevin K. Klausmeyer Robert R. Kane 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(7):o381-o382
In the crystal structure of the title compound, C18H20O5, all geometric parameters fall within experimental error of the expected values. Analysis of the molecular‐packing plots reveals an infinite one‐dimensional linear array running parallel to the c axis, formed by an O—H⃛O intermolecular hydrogen‐bonding interaction. The stilbene framework and most of the substituents are approximately coplanar. 相似文献
11.
Daniel Vega Daniel Fernndez Javier A. Ellena 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(9):1092-1094
The title compound, raloxifene hydrochloride, C28H28NO4S+·Cl?, belongs to the benzothiophene class of antiosteoporotic drugs. In the molecular cation, the 2‐phenol ring sustains a dihedral angle of 45.3 (1)° relative to the benzo[b]thiophene system. The benzo[b]thiophene and phenyl ring planes are twisted with respect to the carbonyl plane, with the smallest twist component occurring between the phenyl and carbonyl planes. The N atom bears the positive charge in the molecular cation and the piperidine ring adopts an almost perfect chair conformation. The Cl? anion is involved in the formation of N—H?Cl and O—H?Cl intermolecular hydrogen bonds, which lead to the formation of a layer of molecular cations. 相似文献
12.
A. Subbiah Pandi D. Velmurugan S. Shanmuga Sundara Raj Hoong‐Kun Fun M. C. Bansal 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(6):o302-o304
The title compound, C19H20O6, crystallizes in the centrosymmetric space group P21/c with one molecule in the asymmetric unit. The molecule is approximately planar and the dihedral angle between the phenyl rings is 11.0 (1)°. The H atoms of the central propenone group are trans. There is an intramolecular O—H⃛O hydrogen bond and the molecules are crosslinked by four intermolecular C—H⃛O hydrogen bonds, producing a three‐dimensional network. 相似文献
13.
Manfredo Hrner Leandro Bresolin Jairo Bordinhao Edmund Hartmann Joachim Strhle 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(8):o426-o427
The structure of the title compound, C12H9N5O4, reveals an almost planar molecule (r.m.s. deviation = 0.061 Å), in which the interplanar angle between the phenyl rings is 5.7 (1)° and the largest interplanar angle is that between the phenyl ring and the nitro group of one of the 4‐nitrophenyl substituents [8.8 (3)°]. The observed molecular conformation suggests a delocalization of π‐electrons extended over the diazoamine group and the terminal aryl substituents. Intermolecular N—H⃛O interactions between the twofold screw‐related molecules give rise to helical chains along the [010] direction. Intermolecular C—H⃛O interactions then generate sheets of molecules in the (10) plane, and these sheets are held together by N⃛C and O⃛O π–π interactions. 相似文献
14.
David B. Lovejoy Des R. Richardson Paul V. Bernhardt 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(3):341-342
The potentially tridentate O,N,S‐donor ligand, 2‐hydroxy‐1‐naphthaldehyde 2‐methylthiosemicarbazone, C13H13N3OS, has been structurally characterized and the molecule is found to exhibit a distorted planar structure with the thiosemicarbazide moiety being twisted slightly out of the plane defined by the naphthyl ring. 相似文献
15.
Daniel Vega Daniel Fernndez Gustavo Echeverría 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(8):1009-1010
The crystal structure of racemic Venlafaxine hydrochloride, C17H28NO2+·Cl?, consists of two types of parallel chains formed by translated Venlafaxine+ cations, hydrogen bonded by Cl? anions, and characterized by the opposite chirality of their constituent molecules. These chains organize in two different types of broad layers of opposite handedness, related by a glide plane. 相似文献
16.
Vijayakumar N. Sonar Sean Parkin Peter A. Crooks 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(1):o6-o8
The title compound, C16H16N2O, which contains a double bond connecting an azabicyclic ring system to an indol‐3‐ylmethylene group, crystallizes from a solution in ethyl acetate. The geometries of the two crystallographically independent molecules are nearly identical. The crystal packing of the title compound involves two types of intermolecular hydrogen bond. 相似文献
17.
Mari Pretorius D. Bradley G. Williams Andreas Roodt Alfred Muller 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(6):o384-o386
The title compounds, Ph2PCH2N(H)Ph or C25H22NP and Ph2PCH2N(CH3)Ph or C26H24NP, respectively, are isomorphous, with calculated theoretical Tolman angles of 174 and 182°. 相似文献
18.
Gordana Pavlovi Julija Matijevi Sosa 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(9):1117-1119
The title compound, C18H13NO3, exists as a ketoamino tautomer implying a fairly short N—H?O intramolecular hydrogen bond between the 2‐naphthalenone and amino moieties [N?O 2.531 (3) Å] which is enhanced by the π‐electron delocalization effect. The naphthaldimine and 3‐carboxyphenyl fragments are inclined at an angle of 4.41 (7)°, so the molecule is almost planar. The molecules are connected by intermolecular O—H?O hydrogen bonds between the carboxy and keto O atoms, forming infinite chains around the twofold screw axes parallel to b . 相似文献
19.
T. V. Sundar V. Parthasarathi K. Sarkunam M. Nallu B. Walfort H. Lang 《Acta Crystallographica. Section C, Structural Chemistry》2004,60(7):o464-o466
The title compounds, C15H16ClN2O+·Br−·1.5H2O and C15H16BrN2O+·Br−·1.5H2O, are isomorphous. The benzene ring is oriented nearly normal to the pyridine ring in both compounds. The molecular packing is mainly influenced by intermolecular O—H⋯O and O—H⋯Br interactions, as well as weak intramolecular C—H⋯O interactions. The H2OBr− units form an extended water–bromide chain, with a bridging water molecule on a twofold axis. 相似文献
20.
Solange M. S. V. Wardell James L. Wardell Mark F. Ward John N. Low Christopher Glidewell 《Acta Crystallographica. Section C, Structural Chemistry》2000,56(7):865-867
Crystals of the title compound, C18H20N4O4, contain equal numbers of (R,R) and (S,S) molecules, but these are not precise enantiomorphs, neither are they related by crystallographic symmetry; in addition, each molecule exhibits approximate, but not exact, twofold rotational symmetry. There are intramolecular N—H?O hydrogen bonds [N?O 2.609 (4)–2.638 (5) Å; N—H?O 125–132°] and the molecules are linked into molecular ladders by C—H?O hydrogen bonds [C?O 3.306 (6)–3.386 (6) Å; C—H?O 146–160°]. 相似文献