نتایج جستجو برای: nmr analysis
تعداد نتایج: 2869644 فیلتر نتایج به سال:
the dopamine has been studied theoretically at the b3lyp/6-31g* level were performed in gasphase. we calculated physical parameters like atomic charges, energy (=>), asymmetry parameter(?), chemical shift @iso, dipole moment and isotropic nmr determinant and in this work we usedgaussian 03 at nmr and calculation by using b3lyp methods with 6-31g* basis set.
the methamphetamine has been studied theoretically at the mp2 [1]/6-31g[2] level in gas phase.methamphetamine has been investigated via nmr, frequencies calculation and nbo analysis. thestructure of methamphetamine was designed primarily using of chem. bio draw and it geometry hasbeen optimized at the mp2/6-31g computational level. the present work consists the study of themethamphetamine repor...
A series of interesting sulfonamides containing hydroxyl group were synthesized under solvent-free conditions. The synthetic route involves the selective reaction of amino alcohol and sulfonating agents. The sulfonamides were obtained by simple procedure after an easy work-up in high yield and purity, and characterized by IR, 1H NMR and 13C NMR analysis. These compounds were tested for antibact...
9.1 Saturation Transfer Difference NMR Principle ......... " 149 9.2 STD-NMR for Characterizing Ligand Binding to Membrane Integrated Proteins. . . . . . . . . . . . . . . . . . .. 153 9.3 Epitope Mapping with STD-NMR . . . . . . . . . . . . . . . . . .. 157 9.4 Group Epitope Mapping with STD-NMR .............. l57 9.5 Binding Constants from STD-NMR Experiments ......... 160 9.6 STD-NMR Analysi...
Nuclear magnetic resonance (NMR) spectroscopy is a well-established method for analyzing protein structure, interaction, and dynamics at atomic resolution in various sample states including solution state, solid membranous environment. Thanks to rapid NMR methodology development, the past decade has witnessed growing number of studies complex systems ranging from membrane mimetics living cells,...
The rheology is widely known as one of the basic methods for rubber investigations for many years. At the same time, a variety of other methods of physical and chemical analysis suitable is available for rubber industry. One of them, the Time-Domain Nuclear Magnetic Resonance (TD--NMR) Spectroscopy is very sensitive to structural properties of elastomer materials. Moreover, by using NMR it is p...
Atactic polystyrene (PS) has an amorphous structure. Compounds such as H2SO4 and SO3 are commonly used as sulfonating agents for various polymers, including PS. The main purpose of this work is to study chemical structural changes in PS arising from sulfonation through DSC analysis and NMR spectroscopy. An increase in the glass transition temperature (Tg) of sulfonated polystyrene and a decreas...
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