Highly transparent and luminescent nanostructured Eu203 doped ZnO films.

Zinc oxide is a wide, direct band gap II-VI oxide semiconductor. Pure and Eu-doped ZnO films are prepared by RF Magnetron sputtering at different doping concentrations (0.5, 1, 3 and 5 wt %). The films are annealed at 500 0C in air for two hours. The structural, morphological and optical properties of the films are characterized using XRD, micro-Raman, AFM, UV-Visible and photoluminescence spectroscopy. The thickness of the films is measured using stylus profilometer. XRD analysis shows that all the films are highly c-axis oriented exhibiting a single peak corresponding to (002) lattice reflection plane of hexagonal wurtzite crystal phase of ZnO. The micro-Raman spectra analysis reveals the presence of E2 high mode in all the samples which is the intrinsic characteristic of hexagonal wurtzite structure of ZnO. The appearance of LO modes indicates the formation of defects such as oxygen vacancies in the films. AFM micrographs show uniform distribution of densely packed grains of size with well defined grain boundaries. All the films exhibit very high transmittance (above 80%) in the visible region with a sharp fundamental absorption edge around 380 nm corresponding to the intrinsic band edge of ZnO. All the films show PL emission in the UV and visible region. Paper presented at the 2nd International Conference on Structural Nano Composites (NANOSTRUC 2014) held 20-21 May 2014 in Madrid, Spain

Highly ordered good crystalline ZnO-doped WO3 thin films suitable for optoelectronic applications.

Highly ordered ZnO-doped WO3 thin films with good crystalline quality are prepared using radio frequency magnetron sputtering technique, and its morphological and structural properties are studied using various characterization tools such as field emission scanning electron microscopy, energy-dispersive x-ray spectroscopy, x-ray diffraction technique, micro-Raman spectroscopy, and x-ray photoelectron spectroscopy. Morphological analysis shows a smooth surface for pure film, whereas the ZnO-doped films presents a dense distribution of grains of larger sizes with well-defined grain boundary. X-ray diffraction studies reveal the enhancement of crystalline quality of the films with increase in ZnO doping concentration up to 5 wt.%, beyond which the crystalline quality gets deteriorated. A phase modification from a single monoclinic WO3 phase to mixed monoclinic WO3 and W18O49 phases is observed for films with higher ZnO doping concentrations

2-[2-Benzoyl-3,3-bis­(methyl­sulfan­yl)prop-2-enyl­idene]malononitrile

The title compound, C15H12N2OS2, is an example of a push–pull butadiene in which the electron-releasing methyl­sulfanyl groups and electron-withdrawing nitrile groups on either end of the butadiene chain enhance the conjugation in the system. Short intra­molecular C—H⋯S inter­actions are observed. In the crystal structure, an O⋯C short contact of 2.917 (3) Å is observed

Characterization of lysozyme crystals with unusually low solvent content

Studies on the low-humidity (88%) forms of tetragonal and monoclinic lysozyme, resulting from water-mediated transformations, have provided a wealth of information on the variability in protein hydration, its structural consequences and the water structure associated with proteins, in addition to facilitating the delineation of the rigid and the flexible regions in the protein molecule and the invariant features in its hydration shell. Surprisingly, monoclinic lysozyme continues to diffract even when the environmental humidity is drastically reduced, thus permitting the structural study of the enzyme at different levels of hydration. As part of a study in this direction, three very low humidity forms, two of them occuring at a nominal relative humidity of 38% and the other at 5% relative humidity, have been characterized. These have unprecedented low solvent contents of 16.9, 17.6 and 9.4%, respectively, as determined by the Matthews method

Synthesis and characterization of chromium(III), manganese(II), iron(III), cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II) and mercury(II) complexes of oxyphenbutazone

775-778Metal complexes of Cr(lll), Mn(II), Fe(III), Co(Il), Ni(II), Cu(II), Zn(II), Cd (II) and Hg(II) with 4-butyl -1- (4-hydroxyphenyl) -2- phenyl-B. 5-pyrazolidinedione (oxyphenbutazone, OPB) have been synthesized and characterised. The IR spectral studies show that except for Hg(II), the ligand coordinates to the metal ion through the nontautomeric carbonyl group. In the case of Hg(Il) complex, both tautomeric and nontautomeric carbonyl groups coordinate to the two Hg atoms. This is supported by the NMR spectrum of the complex

Synthesis and characterization of the complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with phenylbutazone

67-70The hydroxo-bridged complexes of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with 4-butyl-1,2-diphenylpyrazolidine-3,5-dione(phenyl-butazone, PB) and chIoro-bridged complex of Hg(II) with PB have been synthesized and characterized. The IR spectral studies indicate that except for Hg(II),the coordination is through nontautomeric carbonyl group. In the case of Hg(II) complex both tautomeric and nontautomeric carbonyl groups participate in bonding. This is supported by proton NMR spectral studies of the diamagnetic complexes

Water-dependent domain motion and flexibility in ribonuclease A and the invariant features in its hydration shell. An X-ray study of two low-humidity crystal forms of the enzyme

The crystal structures of 88 and 79% relative humidity forms of ribonuclease A, resulting from water-mediated transformations, have been refined employing the restrained least-squares method using X-ray data collected on an area detector to R = 0.173 for 15 326 observed reflections in the 10-1.5 Å resolution shell and R = 0.176 for 8534 observed reflections in the 10-1.8 Å shell, respectively. The comparison of these structures with those of the native, the phosphate-bound and the sulfate-bound forms demonstrates that the mobility of the ribonuclease A molecule involves hinge-bending movement of the two domains and local flexibility within them, particularly at the termini of regular secondary structures and in loops. The comparison also leads to the identification of 31 invariant water molecules in the hydration shell of the enzyme, many of which are involved in holding different parts of the molecule together and in stabilizing local structure. The conformational changes that accompany the partial removal of the surrounding water, particularly those observed in the 79% form, could be similar to those that occur during enzyme action

Water-Dependent Domain Motion and Flexibility in Ribonuclease A and the Invariant Features in its Hydration Shell. An X-ray Study of Two Low-Humidity Crystal Forms of the Enzyme

The crystal structures of 88 and 79% relative humidity forms of ribonuclease A, resulting from water-mediated transformations, have been refined employing the restrained least-squares method using X-ray data collected on an area detector to R = 0.173 for 15 326 observed reflections in the 10-1.5 ,~ resolution shell and R = 0.176 for 8534 observed reflections in the 10-1.8 ,~, shell, respectively. The comparison of these structures with those of the native, the phosphate-bound and the sulfate-bound forms demonstrates that the mobility of the ribonuclease A molecule involves hinge-bending movement of the two domains and local flexibility within them, particularly at the termini of regular secondary structures and in loops. The comparison also leads to the identification of 31 invariant water molecules in the hydration shell of the enzyme, many of which are involved in holding different parts of the molecule together and in stabilizing local structure. The conformational changes that accompany the partial removal of the surrounding water, particularly those observed in the 79% form, could be similar to those that occur during enzyme action