The asymmetric unit of the title salt, C7H7N2 (+)·ClO4 (-), comprises two independent formula units. The solid-state structure comprises corrugated layers of cations and of anions, approximately parallel to (010). The supra-molecular layers are stabilized and connected by C-H⋯O hydrogen bonding to consolidate a three-dimensional architecture. A close pyridin-ium-perchlorate N⋯O contact [2.867 (...

In the title compound, C(16)H(21)N(2)O(+)·Cl(-), the amide group makes a dihedral angle of 25.9 (1)° with respect to the pyridine ring. In the crystal, inter-molecular N-H⋯Cl bonds and weak C-H⋯Cl and C-H⋯O contacts link the cations and the anions into layers parallel to the ac plane. The layers are packed along [010] by hydro-phobic inter-actions between adamantane units.

2014 A general symmetry argument is presented, and experiments on newly synthesized p-decyloxybenzylidene p’-amino 2-methyl butyl cinnamate are described, demonstrating that chiral smectic C and H liquid crystals are ferroelectric. Some of the properties of this new class of ferroelectrics are discussed. In spite of speculation on the possibility of ferroelectric liquid crystalline phases [1], ...

THE ASYMMETRIC UNIT OF THE TITLE SALT [SYSTEMATIC NAME: 2-(3,4-di-hydroxy-phen-yl)ethanaminium nitrate], C8H12NO2 (+)·NO3 (-), contains two independent cations and two independent nitrate anions. The crystal structure consists of discrete nitrate ions stacked in layers parallel to (010). These layers are linked via the dopaminium cations by O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds, forming a ...

In the title compound, [Cd(ClO(4))(2)(C(15)H(18)N(4))(4)], the Cd(II) ion is coordinated in a slightly distorted octa-hedral environment by two trans monodentate perchlorate ligands and four 1-(2-pyrid-yl)-4-(4-pyridylmeth-yl)piperazine (pmpp) ligands. In the crystal structure, mol-ecules are organized into layers parallel to the ab plane by C-H⋯O inter-actions. Similar inter-actions promote th...

In the quinoline fused-ring system of the title compound, C(9)H(9)NO, the pyridine ring is planar to within 0.011 (3) Å, while the partially saturated cyclo-hexene ring adopts a sofa conformation with an asymmetry parameter ΔC(s)(C6) = 1.5 (4)°. There are no classical hydrogen bonds in the crystal structure. Mol-ecules form mol-ecular layers parallel to (100) with a distance between the layers ...

A new actinide borate phosphate, U2[BO4][PO4], was synthesized in a Walker-type multianvil apparatus at 12.5 GPa and 1000 °C. The crystal structure was determined from single-crystal X-ray diffraction data collected at room temperature. U2[BO4][PO4] crystallizes in the monoclinic space group P21/c with four formula units per unit cell and the lattice parameters a = 854.6(2), b = 775.3(2), c = 8...

In the title compound, C(18)H(21)NO(5), the dihydro-pyridine ring adopts a flattened-boat conformation and its planar part forms a dihedral angle of 84.60 (2)° with the benzene ring. In the crystal, inter-molecular N-H⋯O and C-H⋯O hydrogen bonds result in the formation of zigzag layers parallel to (001). These layers are inter-connected via C-H⋯π inter-actions.

The title compound, C(23)H(17)F(5)N(2)O(3), forms a layered centrosymmetric crystal structure in which C-H⋯F inter-actions are responsible for the formation of planar ribbons along [110], meth-oxy-meth-oxy (C-H⋯O) inter-actions for the formation of layers parallel to [[Formula: see text]13], and OCH(3)⋯π and C-F⋯π inter-actions for the stacking of these layers.

Thin crystalline layers of TaAs Weyl semimetal are grown by molecular beam epitaxy on GaAs(001) substrates. The (001) planes the tetragonal lattice parallel to substrate, but corresponding in-plane crystallographic directions substrate and layer rotated 45°. In spite a substantial mismatch (about 19%) between epilayer, no misfit dislocations observed at GaAs(001)/TaAs(001) interface. Only stack...