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Hydrogen bond
Items for "Hydrogen bond"
Crystal structures of the [18]-crown-6 ammoniate C12H24O6 · 2 NH3 and the cryptand [2.2.2] ammoniate C18H36O6N2 · 2 NH3
The crystal structures of the new polyether ligand-ammoniates C12H24O6 · 2 NH3 (1) and C18H36O6N2 · 2 NH3 (2) have been elucidated at 123 K by single crystal X-ray structure analysis...
Keywords: Supramolecular chemistry, Hydrogen bond, Low temperature crystal structure analysis, Ammonia, Crown ether
02/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagCrystal structure of new lanthanide diphosphates KLnP2O7 · 2 H2O (Ln = Gd, Tb, Yb)
Crystals of lanthanide diphosphates KLnP2O7 · 2 H2O [Ln = Gd, Tb, Yb] have been synthesized and investigated by single-crystal X-ray diffractometry...
Keywords: Lanthanide diphosphates, Hydrogen bond, X-ray diffraction, Single crystal structure analysis
03/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagSynthesis and crystal structure of Sr(AsO3OH) and Ba(AsO3OH): crystal chemistry of related MHXO4 (X = As, P, S) compounds
Crystals of M(AsO3OH) (M = Sr and Ba) were synthesized under hydrothermal conditions; single-crystal X-ray structure investigations were performed...
Keywords: MHXO4 compounds, Hydrothermal synthesis, Hydrogen bond, Single crystal structure analysis, X-ray diffraction
12/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagNew hybrid diphosphates Ln2(NH2(CH2)2NH2)(HP2O7)2 · 4 H2O(Ln = Eu, Tb, Er): synthesis, single crystal and powder X-ray crystal structure
Crystals of lanthanide ethylenediamine diphos phates Ln2(NH2(CH2)2NH2)(HP2O7)2 · 4 H2O (Ln = Eu (1), Tb (2), Er (2)) have been synthesized and investigated by single crystal X-ray diffractometry (Eu and Tb phases) and by powder X-ray diffractometry (Er phase)...
Keywords: Diphosphate, Lanthanide, Ethylenediamine, Hydrogen bond, Single crystal structure analysis
12/2006 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagCrystal structures of high-pressure phases in the alumina-water system: II. Powder X-ray diffraction study of a new dense aluminum deuteroxide, δ-Al(OD)3
In this study we report the solution of the structure of δ-Al(OD)3. The crystal structure was determined using powder X-ray diffraction and direct methods, while the positions of deuterium atoms were estimated by difference-Fourier methods and MEM/Rietveld analysis...
Keywords: Aluminum deuteroxide, A-site deficient hydroxy-perovskite, High pressure, Hydrogen bond, Powder diffraction structure analysis
01/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagCharacterization of thin water layers in pulp by tritium exchange. Part 1: Methods development
A new technique for measuring the monolayer water content of fiber is presented. Tritiated water is added to a pulp/water suspension, whereupon the tritium partitions between the bulk water and the pulp...
Keywords: bound water, fiber, free water, hardwood, Hydrogen bond, Isotope exchange, softwood, surface area, Tritium
03/2007 | Holzforschung, Walter de GruyterCharacterization of thin water layers in pulp by tritium exchange. Part 2: Effect of refining on water absorption
The surface area of pulp increases upon refining, which also increases the quantity of bound water...
Keywords: bound water, confined water, fiber, Hydrogen bond, Isotope exchange, refining, SEM, surface area, Tritium
03/2007 | Holzforschung, Walter de GruyterStructure characterization of molecular complexes for non-linearoptical materials. II. 1 : 1 complexes of 4-methyl-morfoline-N-oxide (1) and 3-picoline-N-oxide (2) with 2,4,6-trinitrophenol, studied by X-ray, AM1 and DFT calculations
(1) C6H2N3O7– · C5H12NO2+, Mr = 346.26, P21/c, a = 7.2356(6), b = 10.5765(9), c = 19.593(2) Å, β = 95.101(6)°, V = 1493.5(2) Å3, Z = 4, R1 = 0.0414; (2) C6H2N3O7– · C6H8NO+, Mr = 338.24, P21/n, a = 7.8713(5), b = 6.1979(7), c = 28.697(3) Å, β = 90.028(7)°, V = 1400.0(2) Å3, Z = 4, R1 = 0.0416...
Keywords: Supramolecular synthesis, Hydrogen bond, Picrate, (Hyper)polarizability, Semiempirical AM1
08/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagNew solvated form of the antibiotic azithromycin. Clues about the role of the water retained inside the crystal
The structure of a new semihydrate solvated form of the antibiotic azithromycin is reported. The new form was obtained by partial dehydration of the crystal of the monohydrate-i-PrOH, when the sample was left in laboratory conditions (22–25 °C, 55–65% relative humidity) over a long period of time (about 40 months)...
Keywords: Azithromycin, drugs, Hydrogen bond, Solvent, Single crystal structure analysis
09/2007 | Zeitschrift für Kristallographie, Oldenbourg WissenschaftsverlagNew insight into the pectolite – serandite series: a single crystal diffraction study of Na(Ca1.73Mn0.27)[HSi3O9] at 293 and 100 K
Using synchrotron radiation, a single crystal investigation has been performed at 293 and 100 K for the structural characterization of the manganoan pectolite, Na(Ca1.73Mn0.27)[Si3O8(OH)] (from the pegmatite at Mt...
Keywords: Manganoan pectolite, Hydrogen bond, Topology, Single crystal structure analysis, X-ray diffraction
12/2007 | Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag