The Chemistry of Monovalent Copper in Solutions of Pure and Mixed Nonaqueous Solvents

Gill, Dip Singh; Pathania, Vivek

doi:10.1016/bs.adioch.2015.11.001

Cited by 5 publications

(2 citation statements)

References 99 publications

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“…However, the explanations made in the first 2 paragraphs of the discussion section show that the high 1/T2 and R2-relaxivity values in question are not related to the magnetic field inhomogeneity, but due to the additional contributions caused by different relaxation mechanisms. These mechanisms should be chemical exchange between H and D, spin rotation, and the indirect involvement of quadruple relaxation [32,34,[39][40][41].The use of CDCl3 as a solvent in experiments allows different relaxation mechanisms to be involved [32]. Therefore, the high 1/T2 and R2 values obtained at the 400 MHz NMR frequency are in line with our expectations.…”

Section: Discussionsupporting

confidence: 87%

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

Arsel

Kal

Yılmaz

2021

Journal of Engineering Technology and Applied Sciences

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Petroleum fluid has been extensively studied at low magnetic fields by Nuclear Magnetic Resonance (NMR) Spectroscopy, but high field NMR studies are rarely found in this area. The aim of this study is to determine the proton spin-lattice relaxation rate (1/T 1 ), T 1 relaxivity (R 1 ), proton spin-spin relaxation rate (1/T 2 ) and T 2 relaxivity (R 2 ) of paraffinic CH 2 and gamma CH 3 peaks. For this purpose, crude oil samples were taken from 3 separate wells in the Batman region. Using these samples, 3 different sets were prepared from a mixture of deuterated chloroform (CDCl 3 ) and crude oil. The total volume of each prepared mixture was 1 mL. The crude oil content in each set was changed from 0.05 mL to 0.20 mL in 0.05 mL steps.. Special care has been taken to ensure the best shimming of the NMR spectrometer operating at 400 MHz. T 1 measurements were performed using an inversion recovery (IR) pulse sequence. 1/T 2 values were determined from the half-height line widths of CH 2 and CH 3 peaks. 1/T 1 and 1/T 2 rates and all relaxivities were found to vary from well to well. This change is due to the fluid composition of the wells. The 1/T 2 rates and R 2 relaxivities were found to be considerably greater than the 1/T 1 rates and R 1 relaxivities. R 2 relaxivities for CH 3 were also 2-5 times greater than for CH 2 .The higher 1/T 2 and R 2 relaxivities compared with 1/T 1 and R 1 were attributed to the additional CDCl 3mediated relaxation mechanisms. In conclusion, available data show that high 1/T 2 rates and R 2 relaxivities measured in the high field NMR laboratory can be applied to separate crude oil from other fluids in the oil field.

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Section: Discussionsupporting

confidence: 87%

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

Arsel

Kal

Yılmaz

2021

Journal of Engineering Technology and Applied Sciences

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“…In recent years, a lot of research work has been done on reaction kinetics involving a new and emerging area of Chemistry namely Green Chemistry [5][6][7][8][9][10][11] . Gill et al 12 had been actively engaged in research with Cu(I) salts for several years preparing some rare and new Cu(I) salts and studying preferential solvation of Cu(I) in a large number of binary mixtures of nitriles with nonaqueous solvents. The binary mixtures of AN as a major component and the other nonaqueous solvents as cosolvents were used as a solvent media for conductivity, viscosity, compressibility and NMR studies.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Formation of Concentrated Copper (I) Solutions and Their Role in Hydrometallurgy and Electrorefining: A Green Perspective

2018

IJGHC

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The Chemistry of monovalent copper, i.e., Cu(I) has been exploited to a great extent in the past few decades. Physicochemical studies like molar conductance, viscosity, isentropic compressibility and NMR of Cu(I) complexes with anions such as ClO4 -, NO3 -, SO4 -, HSO4 -, etc. and their derivatives with organic ligands like Acetonitrile, Benzonitrile, Phenanthroline, Dimethyl phenanthroline, Bipyridyl, Thiourea, etc. have been carried out in aqueous and nonaqueous solvents. In addition to these studies, the area of reaction kinetics of the rates of formation of concentrated Cu(I) solutions in binary mixtures of acetonitrile (AN) and dimethylsulfoxide (DMSO) with water (H2O) has also been explored much. It was found that these reactions had strong dependence on the concentration of Cu(II), Ag(I) and Au(I) solution taken for the reaction, quantity and particle size of copper/nickel particles, amount of AN present in AN+H2O mixtures (5%, 10%, 20%, 40% and 50% (v/v)), temperature of the system studied, rate of stirring of the solution (number of revolutions per minute) and the amount of concentrated H2SO4 used to stop the hydrolysis of Cu(II), Cu(I) and Ni(II) salts. All these reactions are quite fast and generate a significant amount of Cu(I) in a given time. The role of these concentrated solutions has further been exploited in the purification of precious metals like copper,

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Solution NMR of transition metal complexes

Cook

2023

Comprehensive Inorganic Chemistry III

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The Chemistry of Monovalent Copper in Solutions of Pure and Mixed Nonaqueous Solvents

Cited by 5 publications

References 99 publications

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

Proton $T_1$ and $T_2$ Relaxivities for $CH_2$ and $CH_3$ Peaks in Crude Oil Measured by 400 MHz NMR

Kinetics of Formation of Concentrated Copper (I) Solutions and Their Role in Hydrometallurgy and Electrorefining: A Green Perspective

Solution NMR of transition metal complexes

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