199 research outputs found
2H-Chromene-2-thione
The crystal structure of the title compound, OS, also known as 2-thiocoumarin, has been determined. The molecule is essentially planar and crystals may display second harmonic generation (SHG) effects
Variable temperature x-ray crystal structure analysis of a type I langbeinite: Rb2Cd2(SO4)(3)
The structure of a type I langbeinite, Rb2Cd2(SO4)(3), displays three different phases, cubic with a = 10.378(5) Angstrom (space group P2(1)3) at room temperature, monoclinic at 120 K with a = 10.328(3), b = 10.322(3), c = 10.325(3) Angstrom, beta = 89.975(1)degrees (space group P2(1)), and orthorhombic at 85 K with a = 10.319(2), b = 10.321(2), c = 10.320(2) Angstrom (space group P2(1)2(1)2(1)), respectively. Precise single-crystal analyses of these phases indicate that Rb2Cd2(SO4)(3) distorts initially from cubic to monoclinic upon cooling followed by a significant reorientation of the SO4 tetrahedra, resulting in an orthorhombic symmetry upon further cooling. The three structures have been established unequivocally using the same crystal. There is no indication of the formation of an intermediate triclinic phase or any lattice disorder as conjectured in several earlier reports on compounds belonging to the type I langbeinite. The bond valence sum analyses of the coordination around the Rb sites indicate asymmetry in the bond strengths which could be the driving force of the ferroelectric behavior in these materials
Propensity of formation of zipper architecture vs. Lincoln log arrangement in solvated molecular complexes of melamine with hydroxybenzoic acids
Molecular complexes of melamine with hydroxy and dihydroxybenzoic acids have been analyzed to assess the collective role of the hydroxyl (OH) and carboxyl (COOH) functionalities in the recognition process. In most cases, solvents of crystallization do play a major role in self-assembly and structure stabilization. Hydrated compounds generate linear chains of melamine molecules with acid molecules pendant resulting in a zipper architecture. However, anhydrous and solvated compounds generate tetrameric units consisting of melamine dimers together with acid molecules. These tetramers in turn interweave to form a Lincoln log arrangement in the crystal. The salt/co-crystal formation in these complexes cannot be predicted apriori on the basis of Delta pK(a) values as there exists a salt-to-co-crystal continuum
Dimorphic Forms in a Non-Centrosymmetric Environment from a Prochiral Molecule: Cooperative Interplay of Strong Hydrogen Bonds and Weak Intermolecular Interactions
4-Fluoro-N-(2-fluorophenyl) benzamide, a prochiral molecule, exhibits dimorphic behavior. This feature has been analyzed in terms of morphology, X-ray single-crystal structure analysis, differential thermal analysis, and measurement of second harmonic generation (SHG) in both forms, which crystallize in noncentric space groups. The dimorphs have different morphologies, a major form as needles and a minor form as thin plates, occurring concomitantly in the same crystallization setup. The plates crystallize in the monoclinic space group , while the needles are in the orthorhombic space group . Strong N-H \cdot\cdot\cdot O hydrogen bonds and weak but highly directional C-H \cdot\cdot\cdot F interactions acting cooperatively are responsible for the observed symmetry steering the molecules to pack in noncentric environments
Disorder Induced Concomitant Polymorphism in 3-Fluoro-N-(3-fluorophenyl)benzamide
The occurrence of concomitant polymorphism in 3-fluoro-N-(3-fluorophenyl) benzamide has been identified to be due to the disorder in the crystal structure. Of the two modifications, the plate form (Form I) crystallizes in the monoclinic centrosymmetric space group C2/c with Z = 4, and the needle form (Form II) crystallizes in the noncentrosymmetric space group P21 with Z = 2. An interesting positional disorder at the bridging atoms in both forms holds the molecular conformation identical, while subtle variations brought by N−H···O hydrogen bonds along with weak C−H···F and F···F interactions result in packing polymorphism
Analysis of intermolecular interactions involving halogens in substituted benzanilides
Crystal structures of halogen-substituted benzanilides have been analyzed in terms of weak interactions involving halogens. The fourc compounds namely 3-fluoro-N-(3-hydroxyphenyl)benzamide, 3-chloro-N-(3-hydroxyphenyl)benzamide, 3-fluoro-N-(4-methylphenyl)benzamide and 3-chloro-N-(4-methylphenyl)benzamide crystallize in monoclinic symmetry. The packing modes in the crystalline lattice generate motifs via N–H· · ·O and O–H· · ·O hydrogen bonds in structures 1 and 2 and via N–H· · ·O hydrogen bond, weak C–H· · ·F and Cl· · ·Cl interactions in structures 3 and 4. These structures when compared with the polymorphs of benzanilide show no orientational disorder and depict subtle conformational changes, which are directed by both strong hydrogen bonds and weak interactions involving halogens
Phase transitions in ; A = Rb, K: Single crystal X-ray diffraction studies
Abstract. The crystal structure of ferroelastic has been determined at two temperatures, which indicates a structural phase transition, tetragonal with , at 293 K and monoclinic with , , , at 90 K. The crystal structure of has also been determined at two temperatures, tetragonal with , at 293 K and tetragonal with , at 100 K. The overall coordination features in both the structures have been analysed in terms of bond valence sum calculations
2H-Chromene-2-thione
The crystal structure of the title compound, OS, also known as 2-thiocoumarin, has been determined. The molecule is essentially planar and crystals may display second harmonic generation (SHG) effects
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