Results 231 to 240 of about 21,966 (276)

Solvatochromism, Linear Solvation Energy Relationships, and Chromatography

Microchemical Journal, 1993
Abstract This work is a review of the phenomenon of solvatochromism, describing in particular its origin in electronic spectroscopy. The physical basis for the Kamlet-Taft π* scale of solvent strength is reviewed and the contributions of solvent dipolarity and polarizability to this empirical scale are emphasized.
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Linear solvation energy relationships in normal phase chromatography based on gradient separations

Journal of Chromatography A, 2017
Coupling the modified Soczewiñski model and one gradient run, a gradient method was developed to build a linear solvation energy relationship (LSER) for normal phase chromatography. The gradient method was tested on dinitroanilinopropyl (DNAP) and silica columns with hexane/dichloromethane (DCM) mobile phases.
Di, Wu, Charles A, Lucy
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Partitioning properties of linear and branched ethers: Determination of linear solvation energy relationship (LSER) descriptors

Fluid Phase Equilibria, 2006
Abstract Solute descriptors of linear solvation energy relationship (LSER) for dialkyl ethers were examined as a means for improving predictions of their fate and behavior in the environment. LSER solute descriptors consist of the excess molar refraction, the polarizability/dipolarity parameter, the effective hydrogen (H)-bond acidity/basicity ...
Endo, Satoshi, Schmidt, Torsten Claus
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Modelling of partition constants: linear solvation energy relationships or PLS regression?

Journal of Chemometrics, 2009
AbstractEstimation methods for partition constants are needed in many fields of engineering and science. The partitioning between phases is determined by the free energy of the transfer and all estimation methods must therefore describe the same entity.
Tao Liu, Tomas Öberg
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Analysis of solvation in ionic liquids using a new linear solvation energy relationship

Journal of Chemical Technology & Biotechnology, 2004
AbstractA new linear solvation energy relationship (LSER) equation, where the solute internal energy term has been incorporated into the traditional LSER equation, is used for the analysis of solvation in ionic liquids. Modeling results obtained using the new LSER equation indicate that all solute parameters (dispersion, polarity, hydrogen bonding ...
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Surface Hydrogen-Bond Components and Linear Solvation Energy Relationship Parameters

The Journal of Adhesion, 1997
Abstract In 1987, van Oss, Chaudhury and Good introduced the Lewis acid (or hydrogen-bond acidic) component, γ+, and Lewis base (or hydrogen-bond basic) component, γ−, and assumed the ratio of γ+ and γ− for water at 20°C to be 1.0. With that ratio, the base components, γ−, for other liquids and polymers appeared to be overestimated.
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Characterization of amine functionalized stationary phases using linear solvation energy relationships

Journal of Chromatography A, 1999
Abstract In a continuing effort to develop quantitative structure–solubility relationships, this work describes the characterization of four amine functionalized stationary phases: Quadrol, tetraethylene pentamine, phenyldiethanolamine succinate, and triethanolamine. Solubility properties of these materials were examined using linear solvation energy
Melissa M McCann, David S Ballantine
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Using the theoretical linear energy solvation energy relationship to correlate and predict nasal pungency thresholds

Journal of Molecular Graphics and Modelling, 2002
The theoretical linear solvation energy relationship (TLSER) has been used to correlate and characterize 44 nasal pungency threshold (NPT) values in man with parameters derived from semi-empirical molecular orbital theory. The resulting relationship provides good correlative (R2 > 0.92) and predictive (R2cy > 0.88) capability.
George R, Famini, Denise, Aguiar, Marvin A, Payne, Ryan, Rodriquez, Leland Y, Wilson   +4 more
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Characterization of Ascentis RP-Amide column: Lipophilicity measurement and linear solvation energy relationships

Journal of Chromatography A, 2010
This study investigates lipophilicity determination by chromatographic measurements using the polar embedded Ascentis RP-Amide stationary phase. As a new generation of amide-functionalized silica stationary phase, the Ascentis RP-Amide column is evaluated as a possible substitution to the n-octanol/water partitioning system for lipophilicity ...
Deborah, Benhaim, Eli, Grushka
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Linear solvation energy relationships in micellar liquid chromatography and micellar electrokinetic capillary chromatography

Journal of Chromatography A, 1995
Linear solvation energy relationships (LSERs) were used to evaluate and characterize chemical interactions that influence retention behavior in micellar liquid chromatography (MLC) and micellar electrokinetic capillary chromatography (MEKC). High correlations were found between solutes' capacity factors in MLC and in MEKC, as well as binding constants ...
S, Yang, M G, Khaledi
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