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5 citations found for Machado, C.
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metal-organic compounds
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The title structure, K2[Co(C11N4O3)2(H2O)4], is isotypic with K2[Fe(C11N4O3)2(H2O)4]. The CoII atom is in a distorted octahedral CoN2O4 geometry, forming a dianionic mononuclear entity. Each dianionic unit is associated with two potassium cations and interacts with adjacent units through O—H
N and O—HO hydrogen bonds.
N and O—HO hydrogen bonds.
research papers
Crystal structures of the β-glucosidase from the fungus H. insolens provided new insights into the structural determinants for glucose tolerance in β-glucosidases.
organic compounds
The title compound exists in a zwitterionic form. There is a strong intramolecular N-HO hydrogen bond, an intramolecular O-HO hydrogen bond, an intermolecular C-HO contact and ![[pi]](/logos/entities/pi_rmgif.gif)
- stacking interactions, resulting in a three-dimensional network.
O hydrogen bond, an intramolecular O-HO hydrogen bond, an intermolecular C-HO contact and - stacking interactions, resulting in a three-dimensional network.
research papers
Diffraction contrast phenomena on X-ray topographs taken with continuous-spectrum synchrotron radiation have been studied at wavelengths of 0.057, 0.064, 0.071, 0.100, 0.154, 0.206 and 0.250 nm. The specimen was a polished plate of natural diamond with surfaces parallel to (110), ½ mm thick. Using the 
11 reflection and a stored electron beam energy of 1.8 GeV all topographs (except that taken with λ = 0.25 nm) were harmonic free. The specimen exhibited mixed-habit growth, containing sectors of normal faceted {111} growth and sectors of non-faceted `cuboid' growth in which growth-surface orientation was variable and only approximately parallel to {100}. Prior to X-ray topography the specimen had received localized damage from implantation with fluorine ions of 17 MeV energy. Features whose variation with wavelength was studied included (1) the relative strengths of integrated reflections from {111} and `cuboid' growth sectors, (2) the intensity of `spike' disorder diffuse reflections relative to sharp Bragg reflections, (3) contrast from inclusions, polishing striae and fracture damage and (4) lattice bending and diffraction contrast at the sites of fluorine ion implantation. Theoretical predictions of the wavelength variation of the intensity of the diffuse reflection images and of contrast due to resolved defects showed good agreement with the observations.
11 reflection and a stored electron beam energy of 1.8 GeV all topographs (except that taken with λ = 0.25 nm) were harmonic free. The specimen exhibited mixed-habit growth, containing sectors of normal faceted {111} growth and sectors of non-faceted `cuboid' growth in which growth-surface orientation was variable and only approximately parallel to {100}. Prior to X-ray topography the specimen had received localized damage from implantation with fluorine ions of 17 MeV energy. Features whose variation with wavelength was studied included (1) the relative strengths of integrated reflections from {111} and `cuboid' growth sectors, (2) the intensity of `spike' disorder diffuse reflections relative to sharp Bragg reflections, (3) contrast from inclusions, polishing striae and fracture damage and (4) lattice bending and diffraction contrast at the sites of fluorine ion implantation. Theoretical predictions of the wavelength variation of the intensity of the diffuse reflection images and of contrast due to resolved defects showed good agreement with the observations.research papers
Based on the bond distances and angles, and the unambiguous location of the H atoms, the crystal structures of 1-(7-chloro-1,4-dihydroquinolin-4-ylidene)thiosemicarbazide and its hydrochloride salt reveal the presence of the unusual imine tautomeric form.
