(E)-Ethyl 2-cyano-3-(1H-pyrrol-2-yl)acrylate.

All the non-H atoms of the title compound, C(10)H(10)N(2)O(2), are nearly in the same plane with a maximum deviation of 0.093 (1) Å. In the crystal, adjacent mol-ecules are linked by pairs of inter-molecular N-H⋯O hydrogen bonds, generating inversion dimers with R(2) (2)(14) ring motifs.

1-(2-Azido-acet-yl)-3-methyl-2,6-diphenyl-piperidin-4-one.

In the title compound, C(20)H(20)N(4)O(2), the piperidine ring adopts a distorted boat conformation. The two phenyl rings form dihedral angles of 82.87 (1) and 84.40 (1)° with respect to the piperidine ring. The crystal packing is stabilized by inter-molecular C-H⋯O and C-H⋯N inter-actions.

Ethyl 4-(3-bromo-phen-yl)-6-methyl-2-oxo-1,2,3,4-tetra-hydro-pyrimidine-5-carboxyl-ate.

In the title compound, C(14)H(15)BrN(2)O(3), the dihydro-pyrimidin-one ring adopts a boat conformation. In the crystal, adjacent mol-ecules are linked through N-H⋯O hydrogen bonds forming an R(2) (2)(8) ring motif and generating a zigzag chain extending in [010].

(Z)-2-[2-(4-Methyl-benzyl-idene)hydrazin-yl]pyridine.

Mol-ecules of the title compound, C(13)H(13)N(3), are essentially planar (r.m.s. deviation for all non-H atoms = 0.054 Å). The dihedral angle between the two aromatic rings is 6.33 (5)°. In the crystal, pairs of centrosymmetrically related mol-ecules are linked through N-H⋯N hydrogen bonds, forming N-H⋯N dimers with graph-set motif R(2) (2)(8).

A facile synthesis of poly(3-octylthiophene)-titanium dioxide nanocomposite particles in supercritical CO2.

Poly(3-octylthiophene) (P3OT)-titanium dioxide (TiO2) nanocomposite powder where TiO2 was embedded with homogeneous dispersion was synthesized by in-situ chemical oxidative polymerization of 3-octylthiophene in the presence of TiO2 nanoparticles in supercritical carbon dioxide (scCO2), using ferric chloride as the oxidant. The synthesized materials could be obtained as dry powder upon venting of CO2 after the polymerization. The composites were subsequently characterized by FT-IR spectroscopy, transmission electron microscopy (TEM), X-ray diffraction studies (XRD), thermogravimetric analysis (TGA) and photoluminescence (PL). The incorporation of TiO2 in the composite was endorsed by FT-IR studies. TGA revealed enhanced thermal stability of P3OT/TiO2 nanocomposite compared to 3-octylthiophene. TEM analysis showed that well dispersed TiO2 nanoparticles in the polymer matrix. Photoluminescence quenching increased with increasing TiO2 concentration in the composite.