Non-bonding interactions of anions with nitrogen heterocycles and phenyl rings: a critical Cambridge Structural Database analysis

CrystEngComm ◽  
2003 ◽  
Vol 5 (69) ◽  
pp. 395-399 ◽  
Author(s):  
Ritu Ahuja ◽  
Ashoka G. Samuelson
Keyword(s):  
Nitrogen Heterocycles ◽  
Cambridge Structural Database ◽  
Database Analysis ◽  
Phenyl Rings ◽  
Structural Database

Crystal structures of four δ-keto esters and a Cambridge Structural Database analysis of cyano–halogen interactions

2015 ◽  
Vol 71 (10) ◽  
pp. 921-928 ◽  
Author(s):  
Kulsoom Kamal ◽  
Hardesh K. Maurya ◽  
Atul Gupta ◽  
Prema G. Vasudev
Keyword(s):  
Crystal Structures ◽  
Crystal Packing ◽  
Noncovalent Interactions ◽  
Halogen Bonding ◽  
Cambridge Structural Database ◽  
Database Analysis ◽  
Molecular Conformations ◽  
Keto Esters ◽  
Organic Molecular Crystals ◽  
Structural Database

The revived interest in halogen bonding as a tool in pharmaceutical cocrystals and drug design has indicated that cyano–halogen interactions could play an important role. The crystal structures of four closely related δ-keto esters, which differ only in the substitution at a single C atom (by H, OMe, Cl and Br), are compared, namely ethyl 2-cyano-5-oxo-5-phenyl-3-(piperidin-1-yl)pent-2-enoate, C19H22N2O3, (1), ethyl 2-cyano-5-(4-methoxyphenyl)-5-oxo-3-(piperidin-1-yl)pent-2-enoate, C20H24N2O4, (2), ethyl 5-(4-chlorophenyl)-2-cyano-5-oxo-3-(piperidin-1-yl)pent-2-enoate, C19H21ClN2O3, (3), and the previously published ethyl 5-(4-bromophenyl)-2-cyano-5-oxo-3-(piperidin-1-yl)pent-2-enoate, C19H21BrN2O3, (4) [Maurya, Vasudev & Gupta (2013).RSC Adv.3, 12955–12962]. The molecular conformations are very similar, while there are differences in the molecular assemblies. Intermolecular C—H...O hydrogen bonds are found to be the primary interactions in the crystal packing and are present in all four structures. The halogenated derivatives have additional aromatic–aromatic interactions and cyano–halogen interactions, further stabilizing the molecular packing. A database analysis of cyano–halogen interactions using the Cambridge Structural Database [CSD; Groom & Allen (2014).Angew. Chem. Int. Ed.53, 662–671] revealed that about 13% of the organic molecular crystals containing both cyano and halogen groups have cyano–halogen interactions in their packing. Three geometric parameters for the C—X...N[triple-bond]C interaction (X = F, Cl, Br or I),viz.the N...Xdistance and the C—X...N and C—N...Xangles, were analysed. The results indicate that all the short cyano–halogen contacts in the CSD can be classified as halogen bonds, which are directional noncovalent interactions.

Hydration in Molecular CrystalsA Cambridge Structural Database Analysis

2003 ◽  
Vol 3 (5) ◽  
pp. 663-673 ◽  
Author(s):  
Amy L. Gillon ◽  
Neil Feeder ◽  
Roger J. Davey ◽  
Richard Storey
Keyword(s):  
Cambridge Structural Database ◽  
Database Analysis ◽  
Structural Database

Influence of ring size on the strength of carbon bonding complexes between anions and perfluorocycloalkanes

2014 ◽  
Vol 16 (36) ◽  
pp. 19192-19197 ◽  
Author(s):  
Antonio Bauzá ◽  
Tiddo J. Mooibroek ◽  
Antonio Frontera
Keyword(s):  
Ab Initio ◽  
Cambridge Structural Database ◽  
Ring Size ◽  
Database Analysis ◽  
Structural Database ◽  
High Level ◽  
Carbon Bonding

High level ab initio calculations and Cambridge Structural Database analysis were used to demonstrate the importance of carbon bonding in cyclobutane rings.

Comparative study of imidazole hydration:Ab initioand electrostatic calculations vs. Cambridge structural database analysis

1990 ◽  
Vol 11 (9) ◽  
pp. 1038-1046 ◽  
Author(s):  
Giuliano Alagona ◽  
Caterina Ghio ◽  
Péter Nagy ◽  
Kálmán Simon ◽  
Gábor Náray-Szabo
Keyword(s):  
Comparative Study ◽  
Cambridge Structural Database ◽  
Database Analysis ◽  
Structural Database ◽  
Electrostatic Calculations

scholarly journals Crystal structures of five 6-mercaptopurine derivatives

2016 ◽  
Vol 72 (3) ◽  
pp. 307-313
Author(s):  
Lígia R. Gomes ◽  
John Nicolson Low ◽  
Diogo Magalhães e Silva ◽  
Fernando Cagide ◽  
Fernanda Borges
Keyword(s):  
Hydrogen Bonds ◽  
Crystal Structures ◽  
Dihedral Angle ◽  
Database Search ◽  
Supramolecular Structures ◽  
Cambridge Structural Database ◽  
Dihedral Angles ◽  
Π Stacking ◽  
Phenyl Rings ◽  
Structural Database

The crystal structures of five 6-mercaptopurine derivatives,viz.2-[(9-acetyl-9H-purin-6-yl)sulfanyl]-1-(3-methoxyphenyl)ethan-1-one (1), C16H14N4O3S, 2-[(9-acetyl-9H-purin-6-yl)sulfanyl]-1-(4-methoxyphenyl)ethan-1-one (2), C16H14N4O3S, 2-[(9-acetyl-9H-purin-6-yl)sulfanyl]-1-(4-chlorophenyl)ethan-1-one (3), C15H11ClN4O2S, 2-[(9-acetyl-9H-purin-6-yl)sulfanyl]-1-(4-bromophenyl)ethan-1-one (4), C15H11BrN4O2S, and 1-(3-methoxyphenyl)-2-[(9H-purin-6-yl)sulfanyl]ethan-1-one (5), C14H12N4O2S. Compounds (2), (3) and (4) are isomorphous and accordingly their molecular and supramolecular structures are similar. An analysis of the dihedral angles between the purine and exocyclic phenyl rings show that the molecules of (1) and (5) are essentially planar but that in the case of the three isomorphous compounds (2), (3) and (4), these rings are twisted by a dihedral angle of approximately 38°. With the exception of (1) all molecules are linked by weak C—H...O hydrogen bonds in their crystals. There is π–π stacking in all compounds. A Cambridge Structural Database search revealed the existence of 11 deposited compounds containing the 1-phenyl-2-sulfanylethanone scaffold; of these, only eight have a cyclic ring as substituent, the majority of these being heterocycles.

The structure of 1,2,4,4,6-pentaphenyl-1,4-dihydropyridine

1990 ◽  
Vol 55 (8) ◽  
pp. 2059-2065 ◽  
Author(s):  
Jaroslav Vojtěchovský ◽  
Jindřich Hašek ◽  
Jiří Ječný ◽  
Karel Huml
Keyword(s):  
Title Compound ◽  
Cambridge Structural Database ◽  
Boat Conformation ◽  
Planar Conformation ◽  
Structural Database ◽  
Independent Molecules ◽  
Dihydropyridine Ring

Title compound is triclinic, Mr = 461.60; P1, a = 9.158(1), b = 16.062(3), c = 19.472(3) Å, α = 110.69(1)°, β = 89.70(1)°, γ = 103.17(1)°, V = 2 600(1) Å3, Z = 4, Do = 1.15(3), Dc = 1.179(1) Mg m-3, λ(CuKα) = 1.5418 Å, μ = 0.509 mm-1, F(000) = 976 K, R = 0.040 for 8 059 unique observed reflections. Both symmetrically independent molecules show a different geometry of the 1,4-dihydropyridine ring: either the boat conformation with apexes C(sp3), N and boat angles 14.7(3)° and 10.3(2)° respectively, or the planar conformation. The conformation has been compared with similar dihydropyridines obtained from Cambridge Structural Database.

scholarly journals Targeted classification of metal–organic frameworks in the Cambridge structural database (CSD)

2020 ◽  
Vol 11 (32) ◽  
pp. 8373-8387 ◽  
Author(s):  
Peyman Z. Moghadam ◽  
Aurelia Li ◽  
Xiao-Wei Liu ◽  
Rocio Bueno-Perez ◽  
Shu-Dong Wang ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Specific Surface ◽  
Large Scale ◽  
Metal Cluster ◽  
Metal Organic Frameworks ◽  
Cambridge Structural Database ◽  
Metal Organic ◽  
Structural Database

Large-scale targeted exploration of metal–organic frameworks (MOFs) with characteristics such as specific surface chemistry or metal-cluster family has not been investigated so far.

Sign in / Sign up

Export Citation Format

Share Document