The title compound, {(C14H16P)[Cu5I6]}n, prepared from the reaction between copper powder, iodine and dimethyldiphenylphosphonium iodide in hydroxyacetone, features an anion that consists of a continuous two-dimensional Cu-I sheet [Cu-I = 2.5960 (14)-2.6994 (13) Å and Cu-I-Cu = 63.28 (5)-114.25 (5)°]. The cation, which lies on a mirror plane, is a typical dimethyldiphenylphosphonium ion. The structure shows a strong tendency towards segregation of the inorganic and organic parts of the structure into separate subspaces. The two-dimensional Cu-I sheet displays a pronounced subcell with pseudo-tetragonal symmetry that is broken by ordered vacancies on the Cu position. The symmetry is further reduced by the orientation of the interleaved organic counter-ion that is inclined with respect to the pseudo-mirror planes defined by the Cu-I sheet normal, perpendicular to the b axis.
The title compound, C17H22O6, having an ester group at O4 of the hexopyranosyl sugar residue shows for the exo-cyclic C=O bond a conformation that is eclipsed to the C4-H4 bond. The two related torsion angles are denoted by syn and cis conformations. The q1 torsion angle (H4-C4-O4-C10) is indicated to have a similar conformation in solution as analyzed by NMR spectroscopy and a Karplus-type relationship.
The structure of 2,3,6,7,10,11-hexahydroxytriphenylene (hhtp) methanol monosolvate, C18H12O6 center dot CH3OH, has triclinic symmetry (space group P (1) over bar). The compound has a three-dimensional layered network structure formed by inter-molecular hydrogen bonding. Structure analysis with Hirshfeld surfaces is shown to be a sensitive method for comparing pi-stacking effects in the five known solvates of hhtp. The title structure shows slightly weaker pi-stacking than the dihydrate, but stronger pi-stacking than the other three solvates.
The title compound, barium niobium titanium oxide, is isostructural with BaNb4O6, i.e. it contains alternating NbO and perovskite-type single slabs. The NbO slabs can alternatively be described as layers of Nb6O12 clusters, condensed via corner sharing among the central Nb6 octahedra.
Single crystals of a nickel vanadium tellurium oide were synthesized. The crystal structure is layered. The buliding units are VO~6~ octahedra and NiO~6~ octahedra and TeO~4~E distorted square pyramids (E being the 5s2^ lone-electron pair of Te^IV^).