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674 articles match your search "syn conformation"Results 1 to 10, sorted by relevance:
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The tennimide macrocycle (I) resides on a twofold axis and adopts an alternate (syn/anti)2 conformation with no inner cavity (niche), unlike all previously reported (syn)4 tennimide conformations. A partial occupancy water molecule (with 0.167 site occupancy) at hydrogen-bonding distances to two symmetry-related carbonyl O atoms (as O—H
O=C) resides on the twofold axis in a molecular niche between two of the pyridine rings. Macrocycle aggregation occurs as one-dimensional chains along the (010) direction.
O=C) resides on the twofold axis in a molecular niche between two of the pyridine rings. Macrocycle aggregation occurs as one-dimensional chains along the (010) direction.
data reports
The structure of N-bromo-S-(4-nitrophenyl)-S-phenylsulfimide, the first crystal structure of an N-halosulfimide, is reported.
organic compounds
The title compound [systematic name: 4-amino-5-cyano-1-(β-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidine hemihydrate], C12H13N5O4·0.5H2O, is a regioisomer of toyocamycin with the ribofuranosyl residue attached to the pyrimidine moiety of the heterocycle. This analogue exhibits a syn glycosylic bond conformation with a χ torsion angle of 57.51 (17)°. The ribofuranose moiety shows an envelope C2′-endo (2E) sugar conformation (S-type), with P = 161.6 (2)° and τm = 41.3 (1)°. The conformation at the exocyclic C4′—C5′ bond is +sc (gauche, gauche), with a γ torsion angle of 54.4 (2)°. The crystal packing is stabilized by intermolecular O—HO, N—HN and O—HN hydrogen bonds; water molecules, located on crystallographic twofold axes, participate in interactions. An intramolecular O—HN hydrogen bond stabilizes the syn conformation of the nucleoside.
O, N—HN and O—HN hydrogen bonds; water molecules, located on crystallographic twofold axes, participate in interactions. An intramolecular O—HN hydrogen bond stabilizes the syn conformation of the nucleoside.research communicationsOpen access
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In the anhydrate crystal of diammonium aquabis(malonato)oxidovanadate(IV), (NH4)2[VO(C3H2O4)2(H2O)], two conformers (syn or anti conformation on the equatorial plane) of complex cations are detected. The DFT calculations for the isomers indicate a slight influence of the conformation on their thermodynamic stability. The anionic complexes interact with adjacent anions and counter-cations through hydrogen bonds, and the hydrogen bonds lead to a structure with alternate stacking of layers consisting of either anti or syn isomers.
research papers
Two new polymorphic forms of 5-nitrofurazone (5-nitro-2-furaldehyde semicarbazone) have been synthesized and structurally characterized by single-crystal and powder X-ray diffraction methods, vibrational spectroscopy, thermal and Hirshfeld surface analysis.
research papers
The phenyloxalamate group has become a particularly important and versatile supramolecular building block in the context of conformationally controlled molecular clefts.
data reports
The title functionalized metacyclophane was crystallized as an ethyl acetate solvate.
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In the title compound, the imidizadoline ring adopts an envelope conformation and the nitrogen lone pairs are oriented in a syn disposition. The crystal packing is stabilized by C—HO hydrogen-bonding interactions.
O hydrogen-bonding interactions.research papers
Five crystals of purine 3′:5′-cyclic nucleotides, viz. cAMP·2H2O, cAMP·0.3H2O, cGMP·5H2O, Na(cGMP)·4H2O and Na(cIMP)·4H2O, have been characterized in terms of the nucleobase syn–anti conformation, ribose and O/P/O/C/C/C ring puckering, inter-nucleotide interactions and nucleotide–Na interactions. The syn–anti preference of various purine nucleotides is analysed statistically based on data from the Cambridge Structural Database.
research papers
The structures of eight benzoylhydrazones show similar conformations and hydrogen-bonding patterns. In most cases, the phenyl ring of the benzoyl group is rotated by about 30° with respect to the keto group. Only one of the amide groups exhibits the syn conformation.
