In the title compound, C(24)H(22)N(2)O(4)S, the central pyrimidine ring is significantly puckered, assuming a conformation inter-mediate between a boat and a screw boat. The nearly planar thia-zole ring (r.m.s. deviation = 0.0258 Å) is fused with the pyriamidine ring, making a dihedral angle of 9.83 (7)°. The carboxyl group is in an extended conformation with an anti-periplanar orientation with...

In the title compound, C15H11BrO3, the dihedral angle between the benzene rings is 72.59 (6)°. In the crystal, pairs of C-H⋯π contacts form inversion dimers. Additional C-H⋯O hydrogen bonds generate R2(1)(6) ring motifs and stack these dimers along the b axis. Short inter-molecular Br⋯O contacts of 3.254 (3) Å are also observed and link the stacks into a three-dimensional network.

The title diphenyl-arsino compound, C(30)H(32)As(2) or Ph(2)As(CH(2))(6)AsPh(2), lies about a crystallographic inversion centre located at the mid-point of the central Csp(3)-Csp(3) bond of the methyl-ene chain. The two benzene rings bonded to As are inclined to one another at a dihedral angle of 75.98 (8)°. In the crystal structure, weak inter-molecular C-H⋯π inter-actions stack the mol-ecules...

In the title compound, C(10)H(8)N(2)·C(4)H(8)N(2)O(2), both the dimethyl-glyoxime and the 4,4'-bipyridine mol-ecules have crystallographic C(i) symmetry. The mol-ecules stack along the a-axis direction with a dihedral angle of 20.4 (8)° between their planes. In the crystal, the components are linked by O-H⋯N hydrogen bonds into alternating chains along [120] and [1[Formula: see text]0].

In the cation of the title compound, C(6)H(6)N(5) (+)·CF(3)COO(-), the pyridine and tetra-zole rings are nearly coplanar, making a dihedral angle of 2.49 (19)°. In the crystal, the cations and anions are connected by inter-molecular N-H⋯O and N-H⋯(F,O) hydrogen bonds, forming centrosymmetric [2 + 2] aggregates, which stack along the a axis.

In this paper we present a vertical-cavity enhanced resonant thermal emitter—a highly directional, narrowband, tunable, partially coherent thermal source. This device enhances thermal emittance of a metallic or any other highly reflective structure to unity near a cavity resonant frequency. The structure consists of a planar metallic surface e.g., silver, tungsten , a dielectric layer on top of...

In this study cross section geometry and material of gasket in proton exchange membrane (PEM) fuel cells have been investigated to achieve optimized fuel cell in terms of energy efficiency. The role of gaskets in fuel cells is sealing of gas flow channels and preventing from combination of them. In a PEM stack, gasket with approved geometry that suffers more stress has better sealing. For this ...