scholarly journals Crystal structure of bis(2-methyl-1H-imidazol-3-ium) tetrachloridocobaltate(II)

2015 ◽  
Vol 71 (9) ◽  
pp. 1064-1066 ◽  
Author(s):  
Mouhamadou Birame Diop ◽  
Libasse Diop ◽  
Thierry Maris
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Asymmetric Unit ◽  
Compound C ◽  
Anions And Cations

The asymmetric unit of the title compound, (C4H7N2)2[CoCl4], consists of two 2-methylimidazolium cations and one tetrahedral [CoCl4]2−anion. The anions and cations interact through N—H...Cl hydrogen bonds to define layers with a stacking direction along [100]. Besides van der Waals forces, weak C—H...Cl interactions between these layers stabilize the crystal packing.

4-Amino-6-chloro-8-p-tolylpteridin-7(8H)-one dichloromethane hemisolvate

2006 ◽  
Vol 62 (7) ◽  
pp. o2680-o2682
Author(s):  
Chong-Gang Duan ◽  
Jiong Jia ◽  
Jian-Wu Wang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Asymmetric Unit ◽  
Bond Lengths ◽  
Compound C ◽  
Normal Ranges ◽  
Independent Molecules

The title compound, C13H10ClN5O·0.5CH2Cl2, crystallizes with two independent 4-amino-6-chloro-8-p-tolylpteridin-7(8H)-one molecules and one dichloromethane molecule in the asymmetric unit. The bond lengths and angles in the molecules are within normal ranges. Intermolecular N—H...N hydrogen bonds link the two independent molecules into hydrogen-bonded dimers. The crystal packing is further stabilized by van der Waals forces.

2,3-Dihydro-1,5-benzothiazepin-4(5H)-one

2006 ◽  
Vol 62 (5) ◽  
pp. o1831-o1832 ◽  
Author(s):  
Bing-Yi Qin ◽  
Gui-Long Zhao
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Asymmetric Unit ◽  
Bond Lengths ◽  
Compound C ◽  
Normal Ranges ◽  
Independent Molecules

The title compound, C9H9NOS, crystallizes with two independent molecules in the asymmetric unit. The bond lengths and angles in both molecules are within normal ranges. The crystal packing is stabilized by intermolecular N—H...O hydrogen bonds and van der Waals forces.

scholarly journals 2,4-Dibromo-2,3-dihydro-1H-inden-1-yl acetate

2012 ◽  
Vol 68 (6) ◽  
pp. o1884-o1884 ◽  
Author(s):  
Ísmail Çelik ◽  
Mehmet Akkurt ◽  
Makbule Yilmaz ◽  
Ahmet Tutar ◽  
Ramazan Erenler ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Stacking Interactions ◽  
Compound C ◽  
Centroid Distance ◽  
Cyclopentene Ring

In the title compound, C11H10Br2O2, the cyclopentene ring fused to the benzene ring adopts an envelope conformation, with the C atom attached to the Br atom as the flap. The crystal structure does not exhibit any classical hydrogen bonds. The molecular packing is stabilized by van der Waals forces and π–π stacking interactions with a centroid–centroid distance of 3.811 (4) Å.

scholarly journals Crystal structure of ethyl 2-[(4-bromophenyl)amino]-3,4-dimethylpent-3-enoate

2014 ◽  
Vol 70 (10) ◽  
pp. o1122-o1123
Author(s):  
Julio Zukerman-Schpector ◽  
I. Caracelli ◽  
Hélio A. Stefani ◽  
Amna N. Khan ◽  
Edward R. T. Tiekink
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Crystal Packing ◽  
Dihedral Angles ◽  
Methyl Groups ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules

In the title compound, C15H20BrNO2, there are two independent molecules (AandB) comprising the asymmetric unit and these adopt very similar conformations. InA, the dihedral angle between the CO2and MeC=CMe2groups is 80.7 (3)°, and these make dihedral angles of 3.5 (3) and 84.09 (16)°, respectively, with the bromobenzene ring. The equivalent dihedral angles for moleculeBare 78.4 (3), 2.1 (3) and 78.37 (12)°, respectively. The most prominent interactions in the crystal packing are amine-N—H...O(carbonyl) hydrogen bonds between the two independent molecules, resulting in non-centrosymmetric ten-membered {...OC2NH}2synthons. Statistical disorder is noted for each of the terminal methyl groups of the ethyl residues.

(E)-4-(Trifluoromethyl)benzaldehyde oxime

2006 ◽  
Vol 62 (7) ◽  
pp. o2683-o2684 ◽  
Author(s):  
Jiong Jia ◽  
Xi-Zhao Wang ◽  
Yan Zhang ◽  
Jian-Wu Wang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Trifluoromethyl Group ◽  
Compound C

In the title compound, C8H6F3NO, the trifluoromethyl group displays rotational disorder. The crystal packing is stabilized by intermolecular O—H...N hydrogen bonds and van der Waals forces.

N-Benzyl-1-(dimethylamino)-2-methyl-1-oxopropan-2-aminium bromide

2006 ◽  
Vol 62 (7) ◽  
pp. o2971-o2972 ◽  
Author(s):  
Pavel Tuzina ◽  
Andreas Fischer ◽  
Peter Somfai
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Compound C ◽  
Hydrogen Bonded

The title compound, C13H21N2O+·Br−, was crystallized from a CH2Cl2 solution of N 2,N 2-dibenzyl-N,N,2-trimethylalaninamide and BBr3. The geometry of the cation is unexceptional. Intermolecular N—H...O and N—H...Br hydrogen bonds link two cations and two anions into a hydrogen-bonded cluster. The crystal packing is further stabilized by van der Waals forces.

scholarly journals Crystal structure of 5-[4-(diethylamino)benzylidene]-2,2-dimethyl-1,3-dioxane-4,6-dione

2015 ◽  
Vol 71 (10) ◽  
pp. 1242-1244
Author(s):  
Egija Stepina ◽  
Dmitrijs Stepanovs ◽  
Inese Mierina ◽  
Mara Jure
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Benzene Ring ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Boat Conformation ◽  
Compound C ◽  
Planar Part

The title compound, C17H21NO4, consists of substituted Meldrum's acid with a [4-(diethylamino)phenyl]methylidene fragment attached to the fifth position. The heterocycle assumes a distorted boat conformation. The planar part of heterocycle is almost coplanar with the benzene ring due to the presence of a long conjugated system in the molecule. This leads to the formation of C—H...O-type intramolecular contacts. As a result of the absence of hydrogen-bond donors in the structure, the crystal packing is controlled by van der Waals forces and weak C—H...O interactions, which associate the molecules into inversion dimers.

scholarly journals Crystal structure of 4-(4-methoxyphenyl)-4′,4′-dimethyl-3-p-tolyl-3′,4′-dihydro-1′H,3H-spiro[isoxazole-5,2′-naphthalen]-1′-one

2015 ◽  
Vol 71 (12) ◽  
pp. o981-o981
Author(s):  
Mohamed Akhazzane ◽  
Ghali Al Houari ◽  
Mohamed El Yazidi ◽  
Mohamed Saadi ◽  
Lahcen El Ammari
Keyword(s):  
Crystal Structure ◽  
Dihedral Angle ◽  
Title Compound ◽  
Crystal Packing ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Dihedral Angles ◽  
Isoxazole Ring ◽  
Compound C ◽  
The Mean

In the title compound, C28H27NO3, the cyclohexanone and isoxazole rings have envelope conformations, with the methylene and spiro C atoms as the flaps, respectively. The mean plane of the isoxazole ring is inclined slightly to thep-tolyl ring, making a dihedral angle of 14.20 (9)°, and is nearly perpendicular to the mean plane through the tetralone moiety and to the methoxyphenyl ring [dihedral angles = 83.41 (8) and 72.12 (9)°, respectively]. The crystal packing is stabilized mainly by van der Waals forces.

scholarly journals Crystal structure of bis(1-hexyl-N,N-dimethylpyridinium) bis(maleonitriledithiolato)nickelate(II)

2016 ◽  
Vol 72 (8) ◽  
pp. 1197-1200
Author(s):  
Shan-Shan Yu ◽  
Hui Zhang
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Crystal Packing ◽  
Asymmetric Unit ◽  
Bite Angle ◽  
Compound C ◽  
Square Planar ◽  
Hydrocarbon Chains ◽  
Bidentate Chelate ◽  
Anions And Cations

The asymmetric unit of the title compound, (C13H23N2)2[Ni(C4N2S2)2], consists of a 1-hexyl-N,N-dimethylpyridinium cation and one half of a [Ni(mnt)2]2−dianion (mnt2−= maleonitriledithiolate) in which the Ni2+cation lies on a crystallographic inversion centre. The square-planar coordination about Ni2+comprises four S atoms from two bidentate chelate mnt2−ligands [Ni—S = 2.1791 (9) and 2.1810 (8) Å, and S—Ni—S bite angle = 91.93 (3)°]. The hydrocarbon chains of cations showtrans-planar conformations and lie approximately parallel to the long molecular axis of the [Ni(mnt)2]2−anions, giving stacks along thecaxis. The anions and cations form layers lying parallel to thebcplane. Only weak C—H...Ni and C—H...π associations are present in the crystal packing.

scholarly journals Crystal structure of a new spiro-polytetrahydrofuran compound with translational pseudosymmetry:rac-(2S,2′S,5′R)-2-methyl-5′-[(1R,2R,5S,5′R)-1,4,4,5′-tetramethyldihydro-3′H-3,8-dioxaspiro[bicyclo[3.2.1]octane-2,2′-furan]-5′-yl]hexahydro[2,2′-bifuran]-5(2H)-one

2017 ◽  
Vol 73 (5) ◽  
pp. 780-784 ◽  
Author(s):  
Vincenzo Piccialli ◽  
Angela Tuzi ◽  
Roberto Centore
Keyword(s):  
Crystal Structure ◽  
Catalytic System ◽  
Title Compound ◽  
Lactone Ring ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
Translation Vector ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules

The title compound, C22H34O6, is a product of oxidation of squalene with the catalytic system RuO4(cat.)/NaIO4. The asymmetric unit contains two crystallographically independent molecules of very similar geometry approximately related by the non-crystallographic translation vectorc/2. As a consequence, the average diffracted intensity in thehkllayers with oddlis systematically lower than in the layers with evenl. In one molecule, the lactone ring and part of the adjacent tetrahydrofuran ring are disordered over two orientations with refined occupancy ratio of 0.831 (10):0.169 (10). The crystal structure is mainly governed by van der Waals forces.

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