In the presence of nickel(II) salts, cyclohexane-1,3-dione dioxime is transformed into a hydrocarbazole oxime cation, isolated as a nitrate salt, N ,9-dihydroxy-5-(hydroxyimino)-2,3,4,5,6,7,8,9-octahydro-1 H -carbazol-4-iminium nitrate ( 1 , C 12 H 16 N 3 O 3 + ·NO 3 − ), and as a hydrated chloride co-crystal with cyclohexane-1,2,3-trione 1,3-dioxime, N ,9-dihydroxy-5-(hydroxyimino)-2,3,4,5,6,7,8,9-octahydro-1 H -carbazol-4-iminium chloride–cyclohexane-1,2,3-trione 1,3-dioxime–water (1/1/3) ( 2 , C 12 H 16 N 3 O 3 + ·Cl − ·C 6 H 8 N 2 O 3 ·3H 2 O). In 1 , the cation and nitrate anion occupy mirror sites. The symmetry-related ring methylene C atoms in the cation are disordered over two positions [occupancies 0.896 (12) and 0.104 (12)]. The asymmetric unit of 2 contains one cation, one trionedioxime molecule, one chloride anion and three water molecules; one water oxygen is disordered over two sites [occupancies 0.935 (7) and 0.065 (7)]. Both cations have an intramolecular N—H...N contact, with the proton distributed over mirror-related sites in 1 but assigned to a single nitrogen site in 2 . The hydroxy group attached to the nitrogen at the 9-position of the hydrocarbazole moiety in 1 forms a hydrogen bond to the nitrate anion, whereas chloride, trionedioxime and water molecules participate in the hydrogen-bonding network of 2 .
The title compound, {(H 3 O)[Pb 2 Br 5 ]} n , crystallizes in the tetragonal space group I 4/ mcm . The asymmetric unit comprises one Pb, two Br and one O sites with site symmetry m .2 m , 4/ m .., .. m and 422, respectively. Bromide ions link the Pb II atoms to form a two-periodic Pb 2 Br 5 − anion extending parallel to the ab plane, whilst hydroxonium cations are embedded between neighbouring inorganic layers. Although the hydrogen positions of the hydroxonium cation could not be determined, close O...Br contacts suggest possible O—H...Br hydrogen-bonding interactions between cations and the anionic layers.
The title compound, C 17 H 9 F 3 N 2 OS, crystallizes in the monoclinic space group P 2 1 / n . The fused thiazolo[3,2- a ]benzimidazole core is nearly planar, whereas the 4-(trifluoromethyl)phenyl ring is twisted by 52.6 (2)° from the thiazole ring. In the crystal, C—H...N hydrogen bonds form [101] chains, complemented by C—F...π and π–π contacts. Hirshfeld analysis reveals major H...F/F...H (21.4%) and C...H/H...C (17.5%) contributions. Energy-framework analysis shows that dispersion (−172.0 kJ mol −1 ) dominates over Coulombic interactions (−53.8 kJ mol −1 ), indicating that cumulative dispersion forces are primarily responsible for crystal cohesion.
The title compound [also called ( R )-3-fluoropyrrolidin-1-ium chloride], C 4 H 9 FN + ·Cl − , crystallizes in the monoclinic Sohncke space group P 2 1 (#4). The asymmetric unit contains one 3-fluoropyrrolidinium cation and one chloride anion. The pyrrolidinium ring adopts a puckered conformation, and the fluorine substituent is bonded to C3 at a distance of 1.396 (3) Å. In the crystal, the ammonium N—H groups form hydrogen bonds with the chloride anions, creating an extended hydrogen-bonded arrangement. Although 3-fluoropyrrolidinium derivatives have been investigated as chiral organic components in hybrid materials, including magnetic and ferroelectric systems, the crystallographic characterization of the hydrochloride salt itself has not been reported.
The crystal structure of the mixed-valent compound PbTe3O8 (= PbIITeIV2TeVIO8), lead(II) bis[oxidotellurate(IV)] tellurate(VI), is isotypic with that of SrTe3O8. It comprises 1∞[Te3O8]2– chains sharing O atoms to form a framework with two types of square channels extending parallel to [001]. The smaller channels (diameter ∼4 Å) are occupied by 12-coordinate PbII atoms in the centre of the channel, whereas the slightly larger channels (diameter ∼4.5 Å) accommodate the stereoactive 5s2 electron lone pair of TeIV.
