Buscar
Mostrando ítems 1-10 de 231
Analysis of Tautomerism in beta-Ketobutanamides by Nuclear Magnetic Resonance: Substituent, Temperature and Solvent Effects
(Lifescience Global, 2012-08)
β-ketoamides are versatile intermediates for the synthesis of several heterocycles and they are also relevant compounds in biological systems, with their tautomeric equilibria being a crucial aspect to be studied in order ...
Multinuclear absolute magnetic resonance thermometry
(Nature, 2019-11-29)
Non-invasive measurement of absolute temperature is important for proper characterization of various pathologies and for evaluation of thermal dose during interventional procedures. The proton (hydrogen nucleus) magnetic ...
Using Proton Nuclear Magnetic Resonance (NMR) as a calibrating reference for magnetic field measurement instruments: Sensitive volume and magnetic field homogeneity
(Elsevier, 2020-02)
Nuclear magnetic resonance can be conveniently used to set up reference values of magnetic flux densities for the calibration of measurement instrumentation. Two measurement procedures are proposed based on the Fourier ...
Proton double irradiation field-cycling nuclear magnetic resonance imaging: Testing new concepts and calibration methods
(Institute of Electrical and Electronics Engineers, 2020-11-11)
Double resonance experiments in field-cycling nuclear magnetic resonance (NMR) are powerful tools for the indirect detection of quadrupolar and electron resonances, dynamic nuclear polarization-induced signal amplification, ...
Combining nuclear magnetic resonance with molecular dynamics simulations to address sumatriptan interaction with model membranes
(Elsevier Ireland, 2019-12)
The goal of this work is to obtain a complete map on the interactions between sumatriptan, an amphiphilic ionizable anti-migraine drug, with lipid bilayers. To this end, we combined two physico-chemical techniques – nuclear ...
On the application of the Kronecker product to three-spin systems
(Springer, 2019-03)
We obtain the matrix representation of a three-spin Hamiltonian by straightforward application of the Kronecker product. The starting point are the Pauli matrices for spin-1/2 and it is not necessary to resort to ladder ...
The influence of relativistic effects on nuclear magnetic resonance spin–spin coupling constant polarizabilities of H2O2, H2S2, H2Se2, and H2Te2
(John Wiley & Sons Inc, 2018-12)
Relativistic and nonrelativistic calculations have been performed on hydrogen peroxide, dihydrogen disulfide, dihydrogen diselenide, and dihydrogen ditelluride, H2X2 (X = O, S, Se, Te), to investigate the consequences of ...
Synthesis and spectroscopic characterization of cyclobutyl hydantoins
(Elsevier Science, 2018-11-01)
The hydantoin moiety has proved to be an important pharmacophore that confers a wide range of biological properties to different derivatives. Thus, synthetic methods have been developed to obtain such molecules. Herein, ...
Structural analysis of natural deep eutectic solvents : theoretical and experimental study
(Elsevier Science, 2018-12)
A theoretical and experimental study was performed on natural deep eutectic solvents (NADES) formed by lactic acid-glucose (LGH), citric acid-fructose (CFH) and citric acid-glucose (CGH). The presence of nuclear Overhauser ...
Probing Surface Effects on α-NaYF4 Nanoparticles by Nuclear Magnetic Resonance
(American Chemical Society, 2020-04)
The structural properties of insulating α-NaYF4 (cubic) nanoparticles with size ranging within 4-25 nm were investigated by high-resolution 23Na and 19F solid-state nuclear magnetic resonance (NMR) spectroscopy under magic ...