In a pair of diastereomeric 脽-hydroxy ethers the relative 1H-NMR chemical shift of the OH proton is diagnostic for the syn or anti stereostructure. This is probably based on the presence of internally hydrogen-bonded structures. The rule is therefore restricted to those compounds for which ...
hydroxyl protonCa(OH) 2multiple pulse NMR techniques/ A3325D Chemical shifts (molecular NMR) A3325 Nuclear magnetic resonance and relaxation in moleculesnuclear quadrupole resonance (NQR)The proton chemical shift tensor of the hydroxyl proton in calcium hydroxide has been measured using multiple pulse...
proton magnetic resonancerotational isomerism/ intramolecular H bond shiftPMR1H NMR spectrainternal rotationOH-group1 H NMR spectra (200 MHz) of solutions containing various 4-X-2,6-bis-(diethylaminomethyl)-phenols (X= OCH 3 , Cl, COOEt, NO 2 ) have been obtained in the temperature range ...
Complex 1H MAS NMR spectra of hydroxylated MgO powders have been assigned by combining DFT embedded cluster calculations and experiments using single pulse, Hahn-echo, and 2D NOESY like sequences. Chemical shifts calculations suggest the qualitative classification of protons into three main categories, ...
Renewable-driven electrocatalytic nitrate conversion offers a promising alternative to alleviate nitrate pollution and simultaneously harvest green ammonia. However, due to the complex proton-electron transfer processes, the reaction mechanism remains el
The NMR parameters (chemical shifts and coupling constants) for two different nuclei possessing scalar couplings are obtained from the 2D 1H–31P HSQC/HMQC experi- ments. A subset of all proton signals with a scalar coupling to phosphorus of organophosphorus compound can be observed by using ...
The number of those proton vacancies increases when the crystallite size decreases or when the ratio of co-precipitated cobalt increases. Proton vacancies shift the oxidation potential of β-Ni(OH) 2 towards less anodic values and, therefore, improve the chargeability and the electrochemical ...
And liquid products were quantitatively examined by proton nuclear magnetic resonance spectroscopy (1H NMR, 500 MHz, Bruker). Typically, the mixture of 0.5 mL the electrolyte and 0.1 mL D2O solution with 7.77 mM DMSO (used as internal standard) was used as measured 1H NMR sample...
It has been reported that doped zirconates such as BaZr0.8Y0.2O3-δ(BZYO20) are robust proton conductors with ionic conductivity above 10−4 S cm−1at a temperature above 600 °C8,14,15. In high temperature proton conductors, BZYO20 exhibits excellent chemical stability in the ...
Gu Y, Kar T, Scheiner S (2000b) Evaluation of the H-bonding properties of CH⋯O interactions based upon NMR spectra. J Mol Struct (Theochem) 500:441–452 Article Google Scholar Scheiner S (2006) Contributions of NH··O and CH··O H-bonds to the stability of β-sheets in protei...