O contact that had been present in phase II and a
new OD. Its structural parameters are determined by m, the shear plane and the shear
vector. O contact formed to a carboxylate in another layer. The results confirm the
lower symmetry assigned in a previous single-crystal neutron diffraction
study.
The X-ray structure determination of two compounds,
each belonging to one of the two series, allowed the experimental validation of the
initial rationale.
OD hydrogen bonds are replaced by shorter OD. The
near-neighbor relations between molecules remain unchanged through all twin
boundaries. The hydroxyl moieties are distributed along the outer edges of the
ribbon and in phase I they connect the ribbons into a layer by chains of OD. Cl
contacts, which involve one of the methyl C atoms belonging to the methyloxime
groups.
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.
Given the important disorder observed in the latter
compound, only a combination of non-harmonic waves, crenel functions and TLS tensors
offered a good modelling of the structure. O contact that had been present in phase
II and a new OD.
O hydrogen bonds and a two-centre
iodo.
A comprehensive description of the hydrogen-bonding
scheme in both polymorphs is given.
The silicide domain consists of a core region,
along the bending contour, where the silicide layer has grown epitaxially with
silicon.
O hydrogen bonds, but short I.
The strong hydrogen bonds link molecules in finite
chains, with hydroxyl O atoms acting as both donors and acceptors of hydroxyl H
atoms.
The hydroxyl moieties are distributed along the
outer edges of the ribbon and in phase I they connect the ribbons into a layer by
chains of OD.
OD hydrogen bonds are replaced by shorter OD. A
layer can assume four different but equivalent positions with respect to its nearest
neighbor.
The chains are linked into a ribbon by a second set
of ND. The chains are linked into a ribbon by a second set of ND.