Preferential solvation of carbohydrates in water-trifluoroethanol mixtures: A solvent detected heteronuclear NMR approach

2021 ◽  
Author(s):  
Bhawna Chaubey ◽  
N Chandrakumar ◽  
Samanwita Pal
Keyword(s):  
Heteronuclear Nmr ◽  
Preferential Solvation ◽  
Simple Approach ◽  
Solvent Interactions ◽  
Longitudinal Relaxation

The present study aims to establish a simple approach involving multi-field multinuclear longitudinal relaxation (R1) analysis of the solvents to decipher solute-solvent interactions during solvation of model carbohydrates in aqueous...

Solute-Solvent Interactions and High Spin ⇌ Low Spin Transitions in Ferric Dithiocarbamates

1985 ◽  
Vol 40 (1) ◽  
pp. 79-83
Author(s):  
P. Ganguli
Keyword(s):  
High Spin ◽  
Alkyl Chain ◽  
Preferential Solvation ◽  
Solvent Interactions ◽  
Spin Transitions

The HS ⇌ LS transition in ferric dithiocarbamates in a number of solvents has been investigated using NMR and is interpreted in terms of preferential solvation or second co-ordination sphere reorganisation effects. These studies clearly demonstrate that neglect of pseudo contact shifts can lead to erroneous conclusions about the spin delocalisation mechanisms. The spin derealization in these systems is by direct σ-delocalization along the alkyl chain. The As values of 2T2 and 6A1 states have the same sign.

Effect of Preferential Solvation on the Kinetics and Thermodynamics of Oxidation of Anilines by Nicotinium Dichromate

2005 ◽  
Vol 60 (10) ◽  
pp. 1105-1111 ◽  
Author(s):  
Durvas S. Bhuvaneshwari ◽  
Kuppanagounder P. Elango
Keyword(s):  
Free Energy ◽  
Preferential Solvation ◽  
Zero Order ◽  
Substituted Anilines ◽  
Isokinetic Relationship ◽  
Solvent Interactions ◽  
Activation Free Energy ◽  
First Order ◽  
Linear Free Energy ◽  
Energy Relationships

The nicotinium dichromate (NDC) oxidation of anilines, in varying mole fractions of benzene/2- methylpropan-2-ol mixtures, in the presence of p-toluenesulfonic acid (TsOH) is first order in NDC and TsOH and zero order with respect to anilines in the concentration range investigated. The NDC oxidation of 15 meta- and para-substituted anilines complies with the isokinetic relationship but not to any of the linear free energy relationships. The activation free energy data failed to correlate with macroscopic solvent parameters such as εr and ENT. Correlation of ΔG# with Kamlet-Taft solvatochromic parameters (α, β , π*) suggests that the specific solute-solvent-solvent interactions play a major role in governing the reactivity.

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