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Both THz-TDS and NMR techniques were employed to study the hydrogen bonding networks formed in 2-propanol/water mixtures. The composition of such solvent mixtures is shown to significantly impact on the mobility of the solute molecules.
The reaction of o-vanillin 1 with o-phenylenediamine 2PD, in dichloromethane at low conditions produced novel amino benzeneamine: 2-amino-N-(2-hydroxy-3-methoxybenzylidene) aniline 2. Intermediate 2 is isolated and obtained as single crystals and the structure was determined and studied by x-ray crystallography. The complete assignments of 2 were made using FTIR, HRMS, 1D and 2D NMR including APT,...
Although NMR has the ability to investigate biological systems non-destructively, its low sensitivity primarily has hampered their investigation compared to other analytical techniques. Therefore, optimizing radio frequency (RF) coils to improve sensitivity do offer benefits in MR spectroscopy (MRS). Sensitivity may be improved for mass- and volume- limited samples if the size of the detection RF...
Phytochemical investigation of Thesium chinense Turcz, led to the isolation of seven compounds from the ethyl acetate extract using column chromatography and preparative TLC. The structures of these compounds were identified as, kaempferol-3-O-beta-D-glucopyranosyl (1rarr2)-O-beta-D-6- acetlyglucopyranoside (I), kaempferol-5-methylether (II), apigenin-5-O- [-L-Rhamnopyranosyl- (1rarr4)-beta-D-glucopyranoside]...
Ultra-violet radiation curing has emerged as a promising technique for enhancing the glass structure and mechanical properties of low-k organosilicate thin films. The present work examines the effects of UV curing on the adhesive and cohesive fracture properties of carbon-doped oxide low-k films. Detailed 29Si and 13C nuclear magnetic resonance spectroscopy was employed to study the effects of UV...
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