1-Vinyl-4-imidazoline-2-thione

The title compound, C5H6N2S, was obtained by deprotonation of 1-vinylimidazole and subsequent reaction with elemental sulfur. In the crystal, the molecules are linked by N—H...S and C—H...S hydrogen bonds, and arranged in layers parallel to theabplane.

3-(1H,1H,2H,2H-Perfluorooctyl)-1-vinyl-4-imidazoline-2-thione

The title compound, C13H9F13N2S, was obtained by reaction of sulfur with the corresponding quaternary salt in the presence of K2CO3. The quaternary salt in turn was obtained by alkylation of 1-vinylimidazole. The crystal structure contains two independent molecules with disordered fluoroalkyl chains with occupancy ratios of 0.7:0.3 and 0.57:0.43.

1-Allyl-2,3-cyclopentenopyridinium chloride

The title compound, C11H14N+·Cl−, was obtained by reaction of 2,3-cyclopentenopyridine and allyl chloride. A network of weak C—H...Cl hydrogen bonds is observed in the crystal structure.

3,3′-(Hexane-1,6-diyl)bis(1-vinyl-4-imidazoline-2-thione)

The title compound, C16H22N4S2, was obtained by the reaction of sulfur with the corresponding quaternary salt in the presence of K2CO3. It crystallizes with two half-molecules in the asymmetric unit; the complete molecules are generated by inversion symmetry with the central CH2—CH2bonds of the hexane bridges being located on inversion centres. In each molecule, the C6-alkyl chain adopts a typical antiperiplanar conformation and the two heterocyclic rings are oriented antiparallel to each other. In the crystal, molecules are linked by C—H...π interactions, forming layers lying parallel to theacplane.

2,5-Bis[(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)sulfanyl]-1,3,4-thiadiazole

The title compound, C18H8F26N2S3, was obtained by doubleS-perfluorohexylethylation of dipotassium 1,3,4-thiadiazole-2,5-dithiolate in methanol. The molecule exhibits twofold rotational symmetry, with the S atom lying on the rotation axis. The fluorocarbon chains adopt helical conformations and the F atoms of the two terminal C atoms are disordered over two sets of sites. No directional intermolecular interactions occur in the crystal.

Synthesis and characterization of the alkali borate-nitrates Na3–x K x [B6O10]NO3 (x=0.5, 0.6, 0.7)

Three novel mixed alkali borate-nitrates Na3−x K x [B6O10]NO3 (x=0.5, 0.6, 0.7) were synthesized hydrothermally; their crystal structures were determined through Rietveld analyses, and supported through EDX as well as vibrational spectroscopy. The phases represent solid solutions of the alkali borate-nitrate Na3(NO3)[B6O10], which was reported in 2002 as a “New type of boron-oxygen framework in the Na3(NO3)[B6O10] crystal structure” (O. V. Yakubovich, I. V. Perevoznikova, O. V. Dimitrova, V. S. Urusov, Dokl. Phys. 2002, 47, 791). Only two of the three crystallographically independent Na+ positions in the new structures are partially substituted by K+; a pure potassium borate-nitrate was not formed until now. The cell parameters of the novel phases vary from a=1261.72(5)–1267.12(5), b=1004.19(5)–1007.96(4), c=770.55(3)–774.38(3) pm, and V=0.97630(6)–0.98905(6) nm3 in the orthorhombic space group Pnma (no. 62), in alignment with increasing K+ content.

Synthesis and structural characterization of Li3Y(BO3)2

Li3Y(BO3)2 was prepared by high-temperature solid state synthesis at 900°C in a platinum crucible from lithium carbonate, boric acid, and yttrium(III) oxide. The compound crystallizes monoclinically in the space group P21/c (no. 14) (Z=4) isotypically to Li3Gd(BO3)2. The structure was refined from single-crystal X-ray diffraction data: a=8.616(3), b=6.416(3), c=10.014(2) Å, β=116.6(2)°, V=494.9(3) Å3, R1=0.0211, and wR2=0.0378 for all data. The crystal structure of Li3Y(BO3)2 consists of [Y2O14] dinuclear units, which are interconnected to each other by planar B(1)O3 groups and LiO4 tetrahedra via common edges and corners along the a axis.

High-pressure synthesis and crystal structure of In3B5O12

Orthorhombic In3B5O12 was synthesized in a Walker-type multianvil apparatus under high-pressure/high-temperature conditions of 12.2 GPa and 1500°C. Its structure is isotypic to the rare earth analogs RE 3B5O12 (RE=Sc, Er–Lu). In the field of indium borate chemistry, In3B5O12 is the third known ternary indium borate besides InBO3 and InB5O9. The crystal structure of In3B5O12 has been determined via single-crystal X-ray diffraction data collected at room temperature. It crystallizes in the orthorhombic space group Pmna with the lattice parameters a=12.570(2), b=4.5141(4), c=12.397(2) Å, and V=703.4(2) Å3. IR and Raman bands of In3B5O12 were theoretically determined and assigned to experimentally recorded spectra.

Synthesis and structural characterization of BaSr2Ge3O9

BaSr2Ge3O9 was prepared by high-temperature solid-state synthesis at 1100°C in a platinum crucible from barium carbonate, strontium carbonate, and germanium(IV) oxide. The compound crystallizes in the triclinic space group P1̅ (no. 2) isotypically to walstromite BaCa2Si3O9. The structure was refined from single-crystal X-ray diffraction data: a=7.104(5), b=10.060(7), c=7.099(5) Å, α=83.0(2), β=77.0(2), γ=70.2(2)°, V=464.3(6) Å3, R1=0.0230, and wR2=0.0602 for all data. BaSr2Ge3O9 is characterized by three-membered rings of germanate tetrahedra. There are three crystallographically different Ge sites (Ge1, Ge2, and Ge3) in each [Ge3O9]6− ring. The rings occur in layers with the apices of alternating rings pointing in opposite directions. The Sr2+ and Ba2+ ions are located in between. The Sr1 cation is eight-fold coordinated, while Sr2 is octahedrally surrounded by oxide anions, and the Ba cation again eight-fold coordinated.