The molecule of the title compound adopts a twisted geometry with rotation approximately 30° between mean planes imidazole and phenyl rings. crystal structure displays hydrogen bonded chains as result N–H···N interactions rings neighboring molecules. These H-bonded are assembled into flat molecular layers parallel to (121) plane. Two intermolecular interactions, involving inversion-related mole...

the one-pot, multi-component synthesis of 4,4′-(arylmethylene)bis(1h-pyrazol-5-ols) by tandem knoevenagel-michael reaction of phenylhydrazine, ethyl acetoacetate and aldehydes in the presence of silica-bonded n-propylpiperazine sulfamic acid (sbppsa) as a recyclable solid acid catalyst was reported. sbppsa showed much the same efficiency when used in consecutive reaction runs.

X-ray absorption near-edge structure ~XANES! and valence-band photoelectron spectroscopy ~PES! were used to investigate the electronic and bonding structures of B-C-N thin films. The intensities of the sp-bonded features in the C K-edge XANES spectra are found to generally decrease as the C concentration increases, whereas the intensities of the sp-bonded features in the spectra of N K-edge XAN...

The title mol-ecule, C(30)H(28)N(2)O(4), has crystallographic twofold rotation symmetry, with the pyrrole planes forming a dihedral angle of 40.49 (4)°. The pyrrole N-H donor and adjacent ester carbonyl acceptor form R(2) (2)(10) hydrogen-bonded rings about inversion centers, leading to chains of hydrogen-bonded mol-ecules along [001].

Silica-bonded n-propyltriethylene-tetramine (SBNPTT) was found as an efficient solid base for the synthesis of 2-amino-5-oxo-5,6,7,8-tetrahydro-4H-chromenes. Chromene derivatives were obtained via the three-component condensation reaction of aromatic aldehydes, malononitrile, and dimedone at 80 oC under solvent-free conditions. The heterogeneous solid base showed much the same efficiency when u...

The dinuclear title complex, [Mg(2)(C(19)H(40)N(3)Si(2))(2)Cl(2)(C(4)H(8)O)(2)], lies on a center of inversion. The Mg(2+) ions are bonded to a chelating N,N'-bonded guanidinate anion, a tetra-hydro-furan mol-ecule and two bridging chloride anions. The geometry of the resulting five-coordinated Mg(2+) ion is a very distorted square-based pyramid with the O atom in the apical position.

An equilibrium Y-Si-0-N melt was infiltrated to eliminate the open porosity of reaction-bonded silicon nitride at 16001800°C. This oxynitride melt contained two equilibrium phases, a P-Si,N, solid phase and a liquid phase at high temperatures. Before infiltration, porous reaction-bonded silicon nitride compacts were heat-treated to completely transform to the P-Si3N, phase. After infiltration, ...

The title compound, [PdCl(2)(C(6)H(16)N(3))](C(7)H(7)SO(3)), consists of a Pd(II) atom bonded to two N atoms of the 1,4,7-triaza-cyclo-nonane (TACN) ligand and two chloride ions, which define a distorted square-planar geometry. The third N atom of the TACN ligand is protonated and hydrogen bonds to the p-toluene-sulfonate anion. The Cl-Pd-Cl angle is larger than the N-Pd-N angle. The packing is...

objective: this in vitro study evaluated the fracture strength and bending amount of twotypes of fiber reinforced composite (frc) and cast metal frameworks used for fabrication of inlay fixed partial dentures (ifpds). materials and methods: seventy-two extracted first maxillary premolars and molars (36 each) were embedded in acrylic resin to represent a missing of second maxillary premolar. frc...

Sulfide-passivated GaAs and InP wafers were directly bonded to explore the efficiency of sulfide passivation on the bonded interfacial properties. We find that the bonded GaAs/InP interfaces after sulfide passivation contain sulfur atoms and a decreased amount of oxide species relative to the pairs bonded after conventional acid treatment; however, the residual sulfur atoms have no effect on th...