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Cannanore, India

Prasanna M.K.,PRNSS College | Sithambaresan M.,Eastern University of Sri Lanka | Pradeepkumar K.,PRNSS College | Kurup M.R.P.,Cochin University of Science and Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title compound, C14H13N3O 3·H2O, adopts an E conformation with respect to the azomethine bond and crystallizes in the amide form. An intramolecular O - H⋯N hydrogen bond occurs. In the crystal, the lattice water molecule plays a major role in the supramolecular architecture by interconnecting adjacent molecules into a three-dimensional netwrok by means of O - H⋯O, O - H⋯N and N - H⋯O hydrogen-bonding interactions. The structure also features two non-classical C - H⋯O interactions. © Prasanna et al. 2013. Source


Prasanna M.K.,PRNSS College | Sithambaresan M.,Eastern University of Sri Lanka | Pradeepkumar K.,PRNSS College | Kurup M.R.P.,Cochin University of Science and Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

In the title compound, C12H11N3O3·2H2O, the dihedral angle formed by the planes of the pyridine and the furan rings of the organic carbohydrazide molecule is 4.66 (7)°. In the crystal, these molecules form stacks along the b-axis direction, neighbouring molecules within each stack being related by inversion and the shortest distance between the centroids of the pyridine and furan rings being 3.714 (1) Å. Molecules from neighboring stacks are linked by pairs of N - H⋯O hydrogen bonds. The water molecules fill the channels between the stacks being linked by O - H⋯O hydrogen bonds into helices along [010]. Besides this, water molecules are involved in O - H⋯N and O - H⋯O hydrogen bonds with the carbohydrazide molecules, thus forming a three-dimensional network, augmented by weak C - H⋯O interactions. Source


Prasanna M.K.,PRNSS College | Sithambaresan M.,Eastern University of Sri Lanka | Pradeepkumar K.,PRNSS College | Kurup M.R.P.,Cochin University of Science and Technology
Acta Crystallographica Section E: Structure Reports Online | Year: 2013

The title compound, C15H12N4O, adopts an E conformation with respect to the azomethine bond and crystallizes in its hydrazinylidene tautomeric form. The dihedral angle between the ring systems is 15.98 (7)°. The phenol O - H group forms an intramolecular O - H⋯N hydrogen bond. In the crystal, pairs of N - H⋯N and C - H⋯O hydrogen bonds link neighbouring molecules into centrosymmetric dimers. These dimers are interconnected by means of three types of π-π stacking interactions. One, with a centroid-centroid distance of 3.577 (1) Å [interplanar separation = 3.4673 (6) Å], connects adjacent molecules into centrosymmetric dimers. The other two interactions, on the outward facing sides of the dimers, are between phenol rings of neighboring molecules [centroid-centroid separation = 3.7907 (13) Å and interplanar separation = 3.5071 (8) Å], and between phthalazin units [centroid-centroid separation = 3.6001 (12) Å and interplanar separation = 3.4891 (7) Å]. In combination, the π-π interactions lead to the formation of infinite layers with molecules stacked along [0-11]. These layers are, in turn, connected with neighbouring layers through the N - H⋯N and C - H⋯O hydrogen bonds, yielding a three-dimensional supramolecular architecture. Source


Abdul Gafoor A.K.,University of Calicut | Musthafa M.M.,University of Calicut | Pradeep Kumar K.,PRNSS College | Pradyumnan P.P.,University of Calicut
Journal of Materials Science: Materials in Electronics | Year: 2012

Silver (Ag) doped thermally stable TiO2 nanoparticles in the anatase phase have been synthesized by a low temperature hydrothermal method. The formation of anatase phase has been investigated by X-ray diffraction. Thermogravimetry and differential scanning calorimetry have been used for thermal studies. Scanning electron microscopy, transmission electron microscopy and energy dispersive spectroscopy have been used for the morphology and composition studies. Surface areas were studied by the Brunauer- Emmett-Tellermethod. Dielectric properties were studied for dopant levels of 0.25, 0.5 and 1.0 wt% at 300 K in the frequency range of 42 Hz-5 MHz. The crystallite size, alternating current (AC) conductivity and dielectric properties of undoped TiO2 nanoparticles were greatly affected by doping with Ag. At high frequencies, the materials showed high AC Conductivity and low dielectric constant. © Springer Science+Business Media, LLC 2012. Source

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