scholarly journals A third polymorph of 1,4-bis(1H-benzimidazol-2-yl)benzene

2014 ◽  
Vol 70 (6) ◽  
pp. o699-o699
Author(s):  
Wei-Wei Fu ◽  
Yan-Fei Liang ◽  
Yang Liu ◽  
Xiao-Ming Zhu
Keyword(s):  
Hydrogen Bonds ◽  
The Other ◽  
Monoclinic Space Group ◽  
Benzimidazole Ring ◽  
Asymmetric Unit ◽  
Orthorhombic Space Group ◽  
Acta Cryst ◽  
Space Group ◽  
Compound C ◽  
Independent Molecules

The title compound, C20H14N4, is a new polymorph of the previously reported structures, which were orthorhombic, space groupPbca[Beiet al.(2000).Acta Cryst.C56, 718–719] and monoclinic, space groupP21/c[Duddet al.(2003).Green Chem.5, 187–192]. The asymmetric unit consists of two independent molecules in which the dihedral angels between the central benzene ring and the outer benzimidazole ring systems are 16.81 (10) and 14.23 (10)° in one molecule and 26.09 (10) and 37.29 (10)° in the other. In the crystal, molecules are linked by N—H...N and C—H...N hydrogen bonds into a tape running along thec-axis direction.

scholarly journals (1S,2R,8R)-11-Amino-2,2-dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.01,3]dodec-10-en-9-one

IUCrData ◽  
2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Mustapha Ait Elhad ◽  
Ahmed Benharref ◽  
Lahcen El Ammari ◽  
Mohamed Saadi ◽  
Abdelouahd Oukhrib ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Monoclinic Space Group ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Space Group ◽  
Axis Direction ◽  
Compound C ◽  
Independent Molecules

The title compound, C16H23Cl2NO, crystallizes in the monoclinic space groupP21with two independent molecules (AandB) in the asymmetric unit. They have essentially the same conformation. Each molecule is built up from fused six- and seven-membered rings and an additional three-membered ring. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, while the seven-membered ring displays a boat conformation. In the crystal, molecules are linked into chains propagating along thea-axis direction by N—H...O hydrogen bonds.

scholarly journals A triclinic polymorph of (−)-(S)-N-benzyl-2-[(R)-6-fluorochroman-2-yl]-2-hydroxyethanaminium bromide

2013 ◽  
Vol 69 (12) ◽  
pp. o1794-o1795
Author(s):  
Yoann Rousselin ◽  
Hugo Laureano ◽  
Alexandre Clavel
Keyword(s):  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Monoclinic Space Group ◽  
Asymmetric Unit ◽  
Acta Cryst ◽  
Triclinic Space Group ◽  
Space Group ◽  
Axis Direction ◽  
Independent Molecules ◽  
Title Molecule

The title salt, C18H21FNO2+·Br−, determined at 115 K, crystallizes in the triclinic space groupP1. The previously reported polymorph occurs in the monoclinic space groupP21and has two independent molecules in the asymmetric unit [Peeterset al.(1993).Acta Cryst.C49, 2157–2160]. In the title molecule, the pyran rings adopt half-chair conformations. The absolute configuration isSfor the hydroxy-bearing C atom andRfor the asymmetric C atom in the dihydropyran unit. In the crystal, the components are linked by N—H...Br and O—H...Br hydrogen bonds, forming chains along thec-axis direction. The crystal studied was refined as an inversion twin.

scholarly journals 2-(1,3-Benzodioxol-5-yl)-1H-benzimidazole

2014 ◽  
Vol 70 (2) ◽  
pp. o157-o157
Author(s):  
Nadir Ghichi ◽  
Mohamed Amine Benaouida ◽  
Ali Benosmane ◽  
Ali Benboudiaf ◽  
Hocine Merazig
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Ring System ◽  
The Other ◽  
Dihedral Angles ◽  
Asymmetric Unit ◽  
Compound C ◽  
The Mean ◽  
Independent Molecules

The asymmetric unit of the title compound, C14H10N2O2, contains two independent molecules. In each molecule, the benzodioxole ring system displays an envelope conformation, with the methylene C atom located at the flap deviating by 0.081 (2) and 0.230 (2) Å from the mean plane formed by the other atoms. The dihedral angles between the benzoimidazole ring system (all atoms) and the benzodioxole benzene ring are 15.35 (6) and 10.99 (7)°. In the crystal, molecules are linked by N—H...N hydrogen bonds into chains running along the [101].

scholarly journals 1-(6-Fluoro-1,3-benzothiazol-2-yl)-2-(1-phenylethylidene)hydrazine

2012 ◽  
Vol 68 (8) ◽  
pp. o2438-o2439 ◽  
Author(s):  
Hoong-Kun Fun ◽  
Ching Kheng Quah ◽  
D. Munirajasekhar ◽  
M. Himaja ◽  
B. K. Sarojini
Keyword(s):  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Phenyl Ring ◽  
Three Dimensional ◽  
Ring System ◽  
The Other ◽  
Asymmetric Unit ◽  
Compound C ◽  
Dimensional Network ◽  
Independent Molecules

The asymmetric unit of the title compound, C15H12FN3S, consists of two independent molecules with comparable geometries. In one molecule, the 1,3-benzothiazole ring system (r.m.s. deviation = 0.011 Å) forms a dihedral angle of 19.86 (6)° with the phenyl ring. The corresponding r.m.s. deviation and dihedral angle for the other molecule are 0.014 Å and 22.32 (6)°, respectively. In the crystal, molecules are linkedviaN—H...N, C—H...F and C—H...N hydrogen bonds into a three-dimensional network. The crystal studied was a non-merohedral twin with a refined BASF value of 0.301 (2).

scholarly journals 1-Methyl-3-(2-methylphenyl)-3a-nitro-1,2,3,3a,4,9b-hexahydrochromeno[4,3-b]pyrrole

2012 ◽  
Vol 68 (6) ◽  
pp. o1735-o1735
Author(s):  
S. Sundaramoorthy ◽  
N. Sivakumar ◽  
M. Bakthadoss ◽  
D. Velmurugan
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
The Other ◽  
Asymmetric Unit ◽  
Pyran Ring ◽  
Pyrrolidine Ring ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules

The asymmetric unit of the title compound, C19H20N2O3, contains two independent molecules in both of which the pyrrolidine ring adopts an envelope conformation, but with a C atom as the flap in one molecule and the N atom in the other. The pyran ring adopts a half-chair conformation in both molecules. In the crystal, molecules are linked via C—H...O hydrogen bonds and C—H...π interactions.

scholarly journals 2,2′-Bis{8-[(benzylamino)methylidene]-1,6-dihydroxy-5-isopropyl-3-methylnaphthalen-7(8H)-one}

2013 ◽  
Vol 69 (11) ◽  
pp. o1626-o1627
Author(s):  
Shukhrat M. Hakberdiev ◽  
Samat A. Talipov ◽  
Davranbek N. Dalimov ◽  
Bakhtiyar T. Ibragimov
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Supramolecular Architecture ◽  
Asymmetric Unit ◽  
Ring Systems ◽  
Compound C ◽  
Phenyl Rings ◽  
Independent Molecules

The asymmetric unit of the title compound, C44H44N2O6, contains two independent molecules with similar conformations. The dihydronaphthalene ring systems are approximately planar [maximum deviations = 0.036 (2), 0.128 (2), 0.0.24 (2) and 0.075 (2) Å]. The dihedral angle between two dihydronaphthalene ring systems is 83.37 (4)° in one molecule and 88.99 (4)° in the other. The carbonyl O atom is linked with the adjacent hydroxy and imino groupsviaintramolecular O—H...O and N—H...O hydrogen bonds. In the crystal, molecules are linked through O—H...O hydrogen bonds into layers parallel to (001), and adjacent layers are further stacked by π–π interactions between dihydronaphthalene and phenyl rings into a three-dimensional supramolecular architecture. In the crystal, one of the isopropyl groups is disordered over two positions with an occupancy ratio of 0.684 (8):0.316 (8).

scholarly journals Crystal structure of 5-amino-5′-chloro-6-(4-chlorobenzoyl)-8-nitro-2,3-dihydro-1H-spiro[imidazo[1,2-a]pyridine-7,3′-indolin]-2′-one including an unknown solvent molecule

2014 ◽  
Vol 70 (9) ◽  
pp. o971-o972
Author(s):  
R. A. Nagalakshmi ◽  
J. Suresh ◽  
S. Sivakumar ◽  
R. Ranjith Kumar ◽  
P. L. Nilantha Lakshman
Keyword(s):  
Hydrogen Bonds ◽  
Solvent Molecule ◽  
Asymmetric Unit ◽  
Acta Cryst ◽  
Compound C ◽  
Benzoyl Group ◽  
Independent Molecules ◽  
Solvent Molecules ◽  
Intramolecular Hydrogen ◽  
Ring Motif

The asymmetric unit of the title compound, C21H15Cl2N5O4, contains two independent molecules (AandB) having similar conformations. The amine (NH2) group forms an intramolecular hydrogen bond with the benzoyl group, giving anS(6) ring motif in both molecules. The central six-membered rings adopt sofa conformations and the imidazole rings are planar (r.m.s deviations = 0.0150 and 0.0166 Å). The pyridine and imidazole rings are inclined to one another by 3.54 (1) and 3.03 (1)° in moleculesAandB, respectively. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming chains along theaaxis which encloseR22(16) ring motifs. The rings are linked by weak N—H...O and C—H...O hydrogen bonds and C—H...π interactions forming sheets lying parallel to (001). A region of disordered electron density, most probably disordered solvent molecules, occupying voids ofca753 Å3for an electron count of 260, was treated using the SQUEEZE routine inPLATON[Spek (2009).Acta Cryst.D65, 148–155]. Their formula mass and unit-cell characteristics were not taken into account during refinement.

scholarly journals Crystal structure of 7′-(4-chlorophenyl)-2′′-(4-methoxyphenyl)-7′,7a',7′′,8′′-tetrahydro-1′H,3′H,5′′H-dispiro[indoline-3,5′-pyrrolo[1,2-c]thiazole-6′,6′′-quinoline]-2,5′′-dione and an unknown solvent

2019 ◽  
Vol 75 (2) ◽  
pp. 189-193
Author(s):  
R. Vishnupriya ◽  
M. Venkateshan ◽  
J. Suresh ◽  
R. V. Sumesh ◽  
R. Ranjith Kumar ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Chair Conformation ◽  
Ring System ◽  
Supramolecular Framework ◽  
Asymmetric Unit ◽  
Acta Cryst ◽  
Π Interactions ◽  
Compound C ◽  
Independent Molecules ◽  
Solvent Molecules

The asymmetric unit of the title compound, C34H28ClN3O3S, contains two independent molecules (A and B). They differ essentially in the orientation of the 4-methoxyphenyl ring with respect to the pyridine ring of the quinoline moiety; this dihedral angle is 37.01 (18)° in molecule A but only 7.06 (17)° in molecule B. In both molecules, the cyclohexanone ring of the isoquinoline unit has a half-chair conformation. In the pyrrolothiazole ring system, the pyrrolo ring in molecule A has a twisted conformation on the N—C fused bond and an envelope conformation in molecule B with the N atom as the flap. The thiazole rings of both molecules have twisted conformations on the N—C fused bond. In the crystal, the A molecules are linked by pairs of N—H...O hydrogen bonds, forming inversion dimers with an R 2 2(8) ring motif. These dimers are linked to the B molecules by an N—H...N hydrogen bond and a series of C—H...O hydrogen bonds, forming layers lying parallel to the (101) plane. The layers are linked by C—H...π interactions and offset π–π interactions [intercentroid distance = 3.427 (1) Å], forming a supramolecular framework. The contribution to the scattering from a region of highly disordered solvent molecules was removed with the SQUEEZE routine in PLATON [Spek (2015). Acta Cryst. C71, 9–18]. The solvent formula mass and unit-cell characteristics were not taken into account during refinement.

Crystal structures and Hirshfeld surface analyses of a des-A-B-aromatic steroidal compound, and two of its derivatives, having a trans-2,3,4,5-tetrahydro-3a-methyl-7-methoxybenz[e]indane skeleton – structural comparisons with reported tetrahydrobenz[e]indene derivatives

2019 ◽  
Vol 74 (9) ◽  
pp. 649-663
Author(s):  
Ligia R. Gomes ◽  
John N. Low ◽  
Alan B. Turner ◽  
Alexander W. Nowicki ◽  
Thomas C. Baddeley ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Intermolecular Interactions ◽  
Hirshfeld Surface ◽  
Dimensional Structure ◽  
Monoclinic Space Group ◽  
Asymmetric Unit ◽  
Space Group ◽  
Π Interactions ◽  
Independent Molecules

AbstractThe crystal structures and Hirshfeld surface analyses of the des-A-B-aromatic steroid derivative, (3a,9b)-1,2,3a,4,5,9b-hexahydro-7-methoxy-3a-methyl-3H-benz[e]-inden-3-one (or 5-methoxy-des-A-estra-5,7,9-triene-17-one) 1, its acetohydrazide derivative, 2, and its hydrazone derivative, 3, are reported. All three compounds crystallize in chiral space groups: compounds 1 and 2 in the orthorhombic space group P212121 each with one molecule in the asymmetric unit, and compound 3 in the monoclinic space group P21 with two similar but independent molecules, Mol A and Mol B, in the asymmetric unit. Both the five-membered and six-membered non-aromatic rings in all three compounds have envelope or near envelope shapes. In compounds 2 and 3 the N=N units have (E)-arrangements. The intermolecular interactions in crystals of compound 1 are C–H · · · O hydrogen bonds and C–H · · · π interactions, in compound 2 N–H · · · O and C–H · · · O hydrogen bonds and C–H · · · π interactions are present, while in compound 3 there are just C–H · · · π interactions. An important substructure in 1 is a sheet of molecules, composed of ${\rm{R}}_6^6(44)$ rings, formed from C–H · · · O(methoxy) and C–H · · · O(carbonyl) hydrogen bonds, the molecules of which form columns linked via the B and D rings, i.e. in a head-to-tail fashion. Compound 2 is an acylhydrazonyl compound, in which the two independent molecules are linked into asymmetric dimers via strong classical N–H · · · O hydrogen bonds, with the formation of ${\rm{R}}_2^2(8)$ rings. In both 1 and 2, further intermolecular interactions result in 3-dimensional structures, while compound 3 has a 1-dimensional structure arising from C–H · · · O interactions generating spiral chains. The results have been compared with existing data.

scholarly journals Bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide methanol hemisolvate

2014 ◽  
Vol 70 (2) ◽  
pp. o127-o128
Author(s):  
Maksym Seredyuk ◽  
Natalia O. Sharkina ◽  
Elzbieta Gumienna-Kontecka ◽  
Anatoly A. Kapshuk
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
The Other ◽  
Dihedral Angles ◽  
Supramolecular Architecture ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules ◽  
Solvent Molecules

The asymmetric unit of the title compound, C18H16N6Se·0.5CH3OH, contains two independent molecules of bis[3-methyl-5-(pyridin-2-yl)-1H-pyrazol-4-yl] selenide with similar C—Se—C bond angles [99.30 (14) and 98.26 (13)°], and a methanol molecule of solvation. In one molecule, the dihedral angles between pyrazole and neighbouring pyridine rings are 18.3 (2) and 15.8 (2)°, and the corresponding angles in the other molecule are 13.5 (2) and 8.3 (2)°. In the crystal, the selenide and solvent molecules are linked by classical O—H...N and N—H...N hydrogen bonds, as well as by weak C—H...O and C—H...π interactions, forming a three-dimensional supramolecular architecture.

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