Thermochemical characteristics of nicotinamide protolytic equilibria in water-dimethylsulfoxide mixtures

Thermochemical characteristics of nicotinamide protolytic equilibria in water-dimethylsulfoxide mixtures

The heat effects of nicotinamide protonation in water-dimethylsulfoxide (DMSO) solutions over the concentration range 0–0.75 DMSO mole fractions were determined calorimetrically at 25.00 ± 0.01°C and ionic strength 0.25 (NaClO 4 ). Changes in the enthalpy of protonation as the content of DMSO increa...

Full description

Saved in:
Bibliographic Details
Published in:Russian Journal of Physical Chemistry A Vol. 86; no. 4; pp. 694 - 696
Main Authors: Grazhdan, K. V., Gamov, G. A., Dushina, S. V., Sharnin, V. A.
Format: Journal Article
Language:English
Published: Dordrecht SP MAIK Nauka/Interperiodica 01-04-2012
Subjects:
Chemistry
Chemistry and Materials Science
Physical Chemistry
Short Communications
protonation
enthalpy
dimethylsulfoxide
nicotinamide
heat effect
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The heat effects of nicotinamide protonation in water-dimethylsulfoxide (DMSO) solutions over the concentration range 0–0.75 DMSO mole fractions were determined calorimetrically at 25.00 ± 0.01°C and ionic strength 0.25 (NaClO 4 ). Changes in the enthalpy of protonation as the content of DMSO increased were found to be described by an S-shaped curve. This curve shape was caused by the dynamics of reagent solvation contributions as the concentration of DMSO grew with the predominance of the nicotinamide solvation contribution.
ISSN:0036-0244
1531-863X
DOI:10.1134/S0036024412040115