The title compound, C18H18O4, is a triclinic polymorph of the previously reported monoclinic polymorph [Han & Zhen (2005 ▶). Acta Cryst. E61, o4358-o4359]. In the crystal of the triclinic polymorph, molecules are linked by two pairs of C-H⋯O hydrogen bonds, forming a two-dimensional network parallel to (102), and enclosing loops with graph set motifs of R2(2)(8) and R2(2)(6).

A new free interactive OpenGL software tool is demonstrated, that visualizes all monoclinic, and so far part of the orthorhombic, triclinic and hexagonal space group symmetries. The software computes with Clifford (geometric) algebra. The space group visualizer originated as a script for the open source visual CLUCalc, which fully supports geometric algebra computation. This paper briefly descr...

The synthesis and crystal structure of a monoclinic (P21/c) polymorph of the title compound, C6H10S2N8, are reported. The mol-ecule has pseudo-twofold rotational symmetry, with the tetra-zole rings being inclined to one another by 5.50 (6)°. In the crystal, mol-ecules are linked by C-H⋯N hydrogen bonds, forming chains propagating along [101] and enclosing R22(20) ring motifs. The chains are lin...

The title compound, Cd2V2O7, was obtained under hydro-thermal conditions. Different from the known monoclinic form, the new polymorph of Cd2V2O7 has triclinic symmetry and is isotypic with Ca2V2O7. The building units of the crystal structure are two Cd(2+) cations, with coordination numbers of six and seven, and two V atoms with a tetra-hedral and a significantly distorted trigonal-pyramidal co...

Tetra-kis(2-methyl-prop-yl)thio-per-oxy-dicarbonic di-amide, or tetra-iso-butyl-thiuram di-sulfide, C18H36N2S4, crystallizes in a general position in the triclinic space group P-1 but shows pseudo-C2 symmetry about the di-sulfide bond. The C-S-S-C torsion angle [-85.81 (2)°] and the dihedral angle between the two NCS2 mean planes [85.91 (5)°] are within the range observed for this compound type...

The redetermined structure of 9α,21-dichloro-11β,17α-dihydroxy-16α-methyl-3,20-dioxopregna-1,4-dien-17-yl furan-2-carboxylate monohydrate, C27H32Cl2O7·H2O, at 100 K has triclinic (P1) symmetry. The structure displays O-H...O hydrogen bonding, which gives rise to infinite sheets extending parallel to the [110] plane. The previously published structure [Chen et al. (2005). J. Pharm. Sci. 94, 2496...

The crystal structure and electronic properties of the rhenium disulfide a triclinic system within density functional theory pseudopotential are investigated. It is shown that calculated primitive cell parameters angles local approximation in good agreement with experimental data. established observed direct-gap character related to interband transitions at point X. electrons energy spectrum ch...