Junaid, Bushiri M; Kochuthresia, T C; Athimoolam, S; Ramakrishnan, V; Vaidyan, V K(Scientific Research Publishing, January 10, 2013)
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Abstract:
Th(BrO3)3·H2O single crystals were grown from its aqueous solution at room temperature. Single crystal XRD, Raman and FTIR techniques were used to investigate the crystal structure. The crystal structure was solved by Patterson method. The as grown crystals are in monoclinic system with space group P21/c. The unit cell parameters are a = 12.8555(18) Å, b = 7.8970(11) Å, c = 9.0716(10) Å, = 90°, = 131.568° and = 90° and unit cell volume is 689.1(2) Å3. Z = 8, R factor is 5.9. The Raman and FTIR studies indicate the lowering of symmetry of bromate anion from C3V to C1. Hydrogen bonds with varying strengths are present in the crystal. The centrosymmetric space group P21/c of the crystal is confirmed by the non-coincidence of majority of Raman and IR bands
Description:
Crystal Structure Theory and Applications, 2013, 2, 70-74
Jacob, Philip; Khan, A; Hess, P(American Institute of Physics, February 15, 2004)
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Abstract:
The Young’s modulus and Poisson’s ratio of high-quality silicon nitride films with 800 nm thickness,
grown on silicon substrates by low-pressure chemical vapor deposition, were determined by
measuring the dispersion of laser-induced surface acoustic waves. The Young’s modulus was also
measured by mechanical tuning of commercially available silicon nitride cantilevers, manufactured
from the same material, using the tapping mode of a scanning force microscope. For this
experiment, an expression for the oscillation frequencies of two-media beam systems is derived.
Both methods yield a Young’s modulus of 280–290 GPa for amorphous silicon nitride, which is
substantially higher than previously reported (E5146 GPa). For Poisson’s ratio, a value of n
50.20 was obtained. These values are relevant for the determination of the spring constant of the
cantilever and the effective tip–sample stiffness
Mohammed Yusuff, K K; Varsha, Gopalakrishnan; Arun, Vasudevan; Manju, Sebastian; Leeju, P; Digna, Varghese(Crystallography Journals,Acta Crystallographica Section E ,Structure Reports, March 24, 2009)
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Abstract:
The asymmetric unit of the title compound, C11H8N4, contains
two independent molecules. In the crystal structure, intermolecular
N—H.....N hydrogen bonds link molecules into
ribbons extended in the [100] direction
Xavier, K O; Chacko, J; Mohammed Yusuff, K K(Elsevier, Applied Catalysis A :General, September 4, 2003)
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Abstract:
Co(II), Ni(II) and Cu(II) complexes of dimethylglyoxime and N,N-ethylenebis(7-methylsalicylideneamine) have been synthesized in situ
in Y zeolite by the reaction of ion-exchanged metal ions with the flexible ligand molecules that had diffused into the cavities. The hybrid
materials obtained have been characterized by elemental analysis, SEM, XRD, surface area, pore volume, magnetic moment, FTIR, UV-Vis
and EPR techniques. Analysis of data indicates the formation of complexes in the pores without affecting the zeolite framework structure, the
absence of any extraneous species and the geometry of encapsulated complexes. The catalytic activities for hydrogen peroxide decomposition
and oxidation of benzyl alcohol and ethylbenzene of zeolite complexes are reported. Zeolite Cu(II) complexes were found to be more active
than the corresponding Co(II) and Ni(II) complexes for oxidation reactions. The catalytic properties of the complexes are influenced by their
geometry and by the steric environment of the active sites. Zeolite complexes are stable enough to be reused and are suitable to be utilized as
partial oxidation catalysts.
Prathapachandra Kurup, M R; Sithambaresan, M; Jayakumar, K(October 31, 2011)
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Abstract:
The title compound, C15H16N4S, exists in the Z conformation
with the thionyl S atom lying cis to the azomethine N atom.
The shortening of the N—N distance [1.3697 (17) A ° ] is due to
extensive delocalization with the pyridine ring. The hydrazine–
carbothioamide unit is almost planar, with a maximum
deviation of 0.013 (2) A ° for the amide N atom. The stability of
this conformation is favoured by the formation of an
intramolecular N—H N hydrogen bond. The packing of
the molecules involves no classical intermolecular hydrogenbonding
interactions; however, a C—H interaction occurs