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Showing 1 to 20 of 28 for “"solvate"”.
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6,6’-Dimethoxygossypol: Molecular Structure, Crystal Polymorphism, and Solvate Formation.
… groups. Prior to this work, the only known solvate that DMG formed was with acetic acid. DMG has methoxy groups substituted at two hydroxyl positions, and consequently there is a decrease in its ability to form hydrogen bonds. Crystallization experiments were set up to see whether, like …
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Environmental effects on the rate of intramolecular electron transfer in trinuclear mixed-valence transition metal carboxylate complexes in the solid state
… where (4-Me-Py) is 4-methylpyridine and S is a solvate molecule, we have found that systematic changes of solvate molecules have a pronounced impact on the phase transitions at which a given complex valence detraps. This sensitivity is a reflection of the fact that the lowest energy electronic …
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Nmr Spectroscopy of Enantiomers in Chiral Solvents: The Relationship Between Solvate Physical Properties and Enantiomeric Spectral Nonequivalence in Model Amine - Alcohol Systems
Made available in DSpace on 2014-12-09T17:36:51Z (GMT). No. of bitstreams: 1 7105061.pdf: 3588128 bytes, checksum: 612c5abb7a0be26878eb367701a9deb1 (MD5) Previous issue date: 1970
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Effect of a wet granulation manufacturing process on the stability of a pharmaceutical drug product
… forms, along with the readily formed chloroform solvate and the less readily formed ethanol solvate of ethinyl estradiol, were subjected to %RH in the range of 11% to 85%. It was demonstrated that the amorphous form and both chloroform and ethanol solvates would revert back to the anhydrous …
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Development and characterization of next generation batteries
… In Chapter 2, the use of highly concentrated solvate electrolyte and the effect of adding hydrofluoroether (HFE) cosolvent on the cycling performance of Li−S battery is discussed. In order to evaluate interactions that might change Li−S battery properties, four different HFEs with varying …
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High oxidation state organometallic and coordination chemistry: The synthesis and reactivity of nitridoosmium(VI) thiolates and alkoxides
… in Chapter 2. The reactivity of the cationic, solvate complex $\rm\lbrack Os(N)(CH\sb2SiMe\sb3)\sb2(NC\sb5H\sb5)\sb2\rbrack\lbrack BF\sb4\rbrack$ with a variety of anionic ligands is reported in Chapter 3. Reactions of this solvate complex with monodentate, anionic ligands yield binuclear or …
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Electron Transfer in Oxo-Centered, Trinuclear, Mixed-Valence Iron-Acetate Complexes
… as pyridine or substituted pyridines and S is a solvate molecule in the solid state lattice.
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Polyoxotitanates and their role in titania sol-gel polymerization
… crystal X-ray diffraction study of its t-BuOH solvate revealed a $\rm Ti\sb{18}O\sb{45}$ metal-oxygen framework having a pentacapped Keggin structure Reaction of the complex with t-amyl alcohol led to the product $\rm\lbrack Ti\sb{18}O\sb{28}H\rbrack (OBu\sp{t})\sb{12}(OAm\sp{t})\sb5$, …
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Neuartige Precursor zur Abscheidung von Selten-Erd-Oxiden
Im Rahmen dieser Arbeit wurden Solvate von Nitraten und Perchloraten der Selten-Erd-Elemente untersucht. Alle Verbindungen konnten strukturchemisch und thermoanalytisch charakterisiert werden, wobei die Zersetzungsrückstände pulverdiffraktometrisch analysiert wurden. Der thermische Abbau führt …
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Anionic polymerization of a series of cyclocarbosiloxanes
… (HMPA) was used as a promoter to solvate the initiator ions and thus increasing the polymerization rate. It was found that water present in the system decreased the polymerization rate and brought about a decrease in the molecular weight of the polymer. The polymerization rate was …
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The crystal landscape and cocrystallization of primary aromatic sulfonamides
… cocrystallization, eutectic compositions, solvates, biochemistry of sulfa drugs and crystal polymorphism. Chapter Two delves into the crystal landscape of the sulfonamide functional group. In this chapter we critically assess several simple primary aromatic sulfonamides identifying the …
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The synthesis and studies of type II porous liquids
… crystallographically as a diethyl ether solvate and its 1H NMR spectrum fully interpreted and assigned for the first time. The previously postulated but unreported R3 has also been characterised crystallographically as a dimethyl sulfoxide solvate, which confirms its alternative …
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Kinetics of alkali metal ion self-exchange on polystyrene sulfonate resin in dimethyl sulfoxide-water media
… is increasingly favored by lack of water to solvate the fixed anions, and, at the highest DMSO levels studied, by insufficient amounts of any solvent to meet the solvation requirements of either cation or anion.</p> <p>Activation energy for diffusion data are consistent with this explanation …
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Applications of modifiers in supercritical fluid extraction and chromatography
… to the inability of pure carbon dioxide alone to solvate many of the compounds of interest. The effects of modifiers in supercritical fluid chromatography have been more thoroughly studied than the effects of modifier in supercritical fluid extraction. The effects of modifier on trapping …
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Beiträge zur Chemie des höherkoordinierten Siliciums: Synthese, Struktur und Eigenschaften neuer Silicate mit SiO 3 C 2 -, SiO 4 C -, SiO 5 - und SiO 6 -Gerüst, Beiträge zur Chemie des tetrakoordinierten Siliciiums: Synthese, Struktur und Eigenschaften von Silanen, Silanolen und Siloxanen
… — lösungsmittelfrei oder in Form wohldefinierter Solvate — dargestellt. Erstmals konnte für die Substanzklasse der zwitterionischen l5Si-Spirosilicate an dem bereits bekannten l5Si-Silicat 1 durch 1H-VT-NMR-Experimente die Energiebarriere für die Enantiomerisierung im Sinne einer …
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Experimental and computational approaches for control and prediction of solid-state of pharmaceuticals
… crystallisation and analysis for polymorph, solvate and salt screening using quartz 96/48 multi well plate with an automated system for collecting high quality Raman spectra was developed and validated. Using this efficient technique, 10 novel salts of amoxapine, 3 novel physical forms of …
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Beiträge zur Chemie von Hydroboraten BHnX4-n - (n = 1-4) des Lithiums, Natriums, Kaliums und Magnesiums
… von Pyridin als Lösemittel gelingt es, Solvate von Lithiumtetrahydroborat mit den Liganden Ethylendiamin und Diethylentriamin darzustellen. Der Vergleich zwischen den Solvaten des Lithiumtetrahydroborates und Lithiumhalogeniden zeigt, dass nur bei guter Solvatation des Lithiumkations …
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The Solid State Ferric Spin-Crossover Transition: Spectroscopic, Magnetic, and Structural Investigations (Moessbauer, Epr, High, Low)
… disordering) of the orientations of the benzene solvate, the perchlorate counterion, and the ethoxy substituents. It is possible that rapid solid state reorientations are responsible for the rapid spin-state interconversions.
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Pharmaceutical applications and crystal structures of trehalose and its derivatives.
… and a,a’-trehalose octaacetate ethyl acetate solvate. These molecules were derivatised from a,a’-trehalose in order to investigate the role of intermolecular hydrogen bonding within crystalline trehalose, by reducing or abolishing the availability of potential hydrogen bonding sites. The …
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Single-conformation spectroscopy of hydrogen bonding networks: Solvation, synthetic foldamers, and neurodegenerative diseases
… onto the solute in a stepwise manner. Here, we solvate a prototypical flexible bichromophore—1,2-diphenoxyethane (DPOE)—by stepwise addition of water molecules. Single-conformation spectroscopy reveals both the structural perturbations associated with water molecule addition and their effect on …
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