Rotational diffusion of coumarins in electrolyte solutions: The role of ion pairs
Article Abstract:
The rotational diffusion of two structurally similar coumarins, coumarin 343 (C343) and coumarin 334 (C334) was studied in dimethyl sulfoxide (DMSO) at several concentrations of LiNO3. The addition of electrolyte ions shifts the equilibrium toward the anionic form of C434, which in turn forms ion pairs with Li(super +), and the large increase in viscosity normalized reorientation times values is due to the association of DMSO solvent molecule with these ion pairs.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
Solvent and rotational relaxation of coumarin 153 in a protic ionic liquid dimethylethanolammonium formate
Article Abstract:
The solvent relaxation and orientational dynamics of coumarin 153 (C-153) is examined in N,N-dimethylethanolammonium formate (DAF) with a variation of temperature. The optimized structure of DAF has shown a nonbonded interaction between cation and anion, suggesting that a hydrogen bond is formed between hydrogen atoms attached to the nitrogen atom of the cation with the oxygen atom of the anion in DAF.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2008
User Contributions:
Comment about this article or add new information about this topic:
Rotational relaxation of non-dipolar probes in triton X-100 micelles in the presence of added salt: Correlation of lateral diffusion coefficient with "dry" micelle radiusRawlett, Adam M.
Article Abstract:
The light scattering studies on the hydrodynamic radius of TX-100 micelles increases by a factor of 2.2 upon the addition of 2.0 M NaCl due to increase in both the aggregation number and mechanically entrapped water. The micelle gets dehydrated in the presence of electrolyte due to decrease in the thermodynamically bound water, and consequently the 'dry' micelle radius increases.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Osmotic coefficients and surface tensions of aqueous electrolyte solutions: role of dispersion forces. Light, Neutron, X-ray scattering, and conductivity measurements on aqueous dodecyltrimethylammonium bromide/1-hexanol solutions
- Abstracts: Amide I vibrational dynamics of N-methylacetamide in polar solvents: The role of electrostatic interactions. Molecular dynamics simulation of crystal-induced membranolysis
- Abstracts: Structure of poly(acrylic acid) in electrolyte solutions determined from simulations and viscosity measurements
- Abstracts: Distinct difference in ionic transport behavior in polymer electrolytes depending on the matrix polymers and incorporated salts
- Abstracts: The potential distribution at the semiconductor/solution interface. Synthesis of ZnO nanoparticles in 2-propanol by reaction with water