carbonyl interaction. carbonyl
interaction.
Neighbouring parallel chains are crosslinked by
water molecules, resulting in a three-dimensional architecture. Both the major and
minor conformers of the pyrrolidine ring adopt conformations intermediate between a
half-chair and an envelope.
The molecules are crosslinked by nine hydrogen
bonds into layers parallel with the ac plane. The results confirm the lower symmetry
assigned in a previous single-crystal neutron diffraction study. O interactions
involving the methyl and CH groups, and the sulfonyl O atoms of the acesulfamate
group. Neighbouring parallel chains are crosslinked by water molecules, resulting in
a three-dimensional architecture. Reports on new protein structures are particularly
encouraged, as are papers on crystallographic binding studies, structural analysis
of mutants and other structure-function studies. In structures of NA determined
previously, a calcium ion is observed to coordinate amino acids near the
substrate-binding site. In structures of NA determined previously, a calcium ion is
observed to coordinate amino acids near the substrate-binding site. The asymmetric
unit consists of one complete thiourea molecule and one-half of a dimethyl oxalate
molecule lying on an inversion centre. Rods of weak diffuse scattering confirm the
stacking model. O hydrogen bonds to two different trichlate ions.
Papers on the crystallization of biological
molecules will be accepted providing that these focus on new methods or other
features that are of general importance or applicability.
The strong hydrogen bonds link molecules in finite
chains, with hydroxyl O atoms acting as both donors and acceptors of hydroxyl H
atoms. The published paper contains an encapsulation of the data that are essential
to understanding the main features of the study. O hydrogen bonds and a two-centre
iodo.
O hydrogen bonds, thus interconnecting the chains
of thiourea molecules to form completely connected sheets.
Adjacent chains are arranged in a cross-like
fashion around the mid-point of the bipy ligands, resulting in a three-dimensional
supramolecular array. The striking feature in both crystal packings is that they do
not contain the expected conventional hydrogen bonds, in spite of the presence of
good hydrogen-bonding functionalities.
The silole ligands present a propeller-like
arrangement of the benzene rings around the Si-containing five-membered ring. S
interactions, and is affected by the alkyl-chain lengths.
The dihedral angles between the complexed
nitroxides and the benzene rings to which they are bound are smaller than those
found in the free ligand.
O hydrogen bonds, together with a two-centre iodo.
Papers on crystallographic methods should be oriented towards biological
crystallography, and may include new approaches to any aspect of structure
determination or analysis.
The molecules are stacked in dimers with
antiparallel dipoles. Nevertheless, the molecule remains conjugated, with a
shortening of the same bonds as in DANS.