protonation constants
Determination of protonation constants and structural correlations for some tertiary formamides and acetamides in sulfuric acid with UV spectroscopy
... Protonation constants of weak organic bases are obtained by analyzing the changes of some physical properties of the observed substrates, starting from free towards protonated base, by in- creasing the ...
11
Determination of protonation constants of some 3 alkyl(aryl) 4 (ptert butyl(benzyl/benzyliden)amino) 4,5 dihydro 1H 1,2,4 triazole 5 one derivatives with spectrophotometric method
... This study is also concerned with the effect of solvent composition on the stoichiometric protonation constants. The literature data indicate that the equilibrium constants are directly related to ...
9
Determination of the protonation constants of some chalcones [(2E) 1 (substituted methylthiophene 2 yl) 3 (substituted pyridinyl)prop 2 en 1 ones] by the potentiometric method in nonaqueous solvents
... 20 DPC 1 2 Available online at www derpharmachemica com Scholars Research Library Der Pharma Chemica, 2009, 1(2) 153 161 (http //derpharmachemica com/archive html) ISSN 0975 413X www scholarsresearchl[.] ...
9
SYNTHESIS, CHARACTERIZATION AND ANALYTICAL STUDIES OF SOME NEW AZODYES DRIVEN FROM O VANILLIN
... All the reagents and solvents were of reagent-grad quality, The progress of reaction was monitored by TLC using silica gel coated plates (0.5mm thickness, Merck) and spots were visualized under UV radiation. Infrared ...
9
Protoletic Equilibria of L Phenylalanine and Maleic Acid in DMF Water Mixture
... approximate protonation constants of L-phenylalanine and maleic acid were calculated with the computer program SCPHD ...stepwise protonation constants (log K) with the mole fraction of the ...
8
A potentiometric study of some solution equilibria involving biological ligands and transition metal ions
... proton complexes present. The steps that are usually followed, for such work are : firstly, the calibration of the electrodes to respond to concentrations, then the measurement of the protonation constants ...
339
Influence of Anionic Micelles on Protonation Equilibria of L-Dopa and Catechol
... the protonation equilibria of dopa in dioxan-water mixture was reported 31 where the log values of protonation constants of dopa increased linearly with decreasing dielectric constant of the ...of ...
7
Determination of the pKa of Some Triazole Derivatives by the Potentiometric Method in Dioxan-Water Mixtures
... The protonation constants given in tables 1 are considered in more detail in order to gain more information about the effect of solvent composition and specific effects of substituents on the acidity of ...
6
Influence of Dielectric constant on Protonation Equilibria of Glutathione in aqueous solutions of propylene glycol and acetonitrile
... The protonation constants of glutathione have been determined pH metrically in ...The protonation constants have been calculated with the computer program MINIQUAD75 and the best fit chemical ...
8
← Return to Article Details EFFECT OF CATIONIC MICELLES OF CETYLTRIMETHYLAMMONIUM BROMIDE ON PROTONATION EQUILIBRIA OF SALICYLIC ACID DERIVATIVES
... stepwise protonation constants (log K) with the mole fraction of the medium was analyzed on electrostatic grounds for the solute-solute and solute-solvent ...
6
Podzols: aspects of their chemistry and development
... Potentiometric and spectrophotmetric data were used in the calculation of ligand protonation constants and metal ligand stability constants for two ferrous complexes and in studying the [r] ...
364
Potentiometric Determination of Some Solution Thermodynamic Parameters of Three Hydroxypyrone Derivates.
... of protonation constants was interpreted with the Debye-Hückel and the Specific ion Interaction Theory (SIT) equations, in this last case specific interaction coefficients were also ...general, ...
29
Trimethyl Phosphite Mediated Simple Synthesis of Coumarins and Azacoumarins Through the Reaction of Phenols or Hydroxypyridines and Dimethyl Acetylenedicarboxylate (DMAD) or Diethyl Acetylenedicarboxylate (DEAD)
... ABSTRACT: Protonation of the reactive intermediate produced in the reaction between trimethyl phosphite and dimethyl acetylenedicarboxylate or diethyl acetylenedicarboxylate by resorcinol, 5- methylresorcinol, ...
5
AN INVESTIGATION OF THE PROTONATION STATES OF HUMAN LACTOFERRIN IRON-BINDING PROTEIN
... Experimental evidence [12] has shown that lactoferrin molecule binds tightly ferric ions and retains them until ~pH 3.0 this suggests that conformational changes induced by iron binding and release are pH sensitive ...
5
Analysis of acid-base properties of some p-substituted aromatic hydrazones in aqueous perchloric acid by spectrophotometric and semiempirical methods
... the protonation site can be tested by comparison of the partial charges calculated with the semiempirical ...i.e. protonation of the sp 2 hybri- dized nitrogen ...
12
A joint model for vehicle type and fuel type choice: evidence from a cross-nested logit study
... three constants suggest some allegiance to the reference alternative, along with a small amount of reading left to right impact (not statistically significant for the third ...type constants, the large ...
28
Computational investigations on metalloenzymes and metallo-like biomolecules.
... Scheme 6.3 Proposed reaction mechanism for MetSO reduction via a second.. protonation and a direct thiol attack ...[r] ...
149
Understanding the logical constants and dispositions
... A propositional account of understanding the logical constants can meet constraint (CT). Moreover it can do so while avoiding the charge that it is conceptually too demanding. By contrast dispositionalist accounts ...
19
On some constants in simultaneous approximation
... Pointwise estimates for the error which is feasible in simultaneous approximation of a function and its derivatives by an algebraic polynomial were originally pursued from theoretical.. [r] ...
8
Applying DEKOIS 2.0 in structure-based virtual screening to probe the impact of preparation procedures and score normalization
... differences in the decoys or bioactives was assessed by a shuffling experiment. In both cases the importance of the protonation state differences seemed small, yet slightly more relevant for the bioactive ...
16