in this study, the ion association phenomenon in the saturated solution of kcl in the mixed solvent(methanol+water) was studied. the solubility of this compound in the mixed solvent (methanol+water by value percent of methanol = 60%), and in the presence of various molarities of nano3 wasdetermined by the solvent evaporation method at 25.0°c. the results enable us to estimate the valueof thermo...

““Cd and :“P NMR have been used to determine the effect of variations in the nature and stoichiometry of bound metal ion and pH on the allosteric interactions (negative cooperativity) induced on association of phosphate with the dimeric zinc metalloenzyme Escherichia coli alkaline phosphatase. At pH 8.0, successive additions of an extra two Zn’+ ions and one Mg”+ ion to the Znzs+ enzyme result ...

““Cd and :“P NMR have been used to determine the effect of variations in the nature and stoichiometry of bound metal ion and pH on the allosteric interactions (negative cooperativity) induced on association of phosphate with the dimeric zinc metalloenzyme Escherichia coli alkaline phosphatase. At pH 8.0, successive additions of an extra two Zn’+ ions and one Mg”+ ion to the Znzs+ enzyme result ...

In 1,2-difluorobenzene (DFB), electrolyte conductivity measurements and cyclic voltammetric titration on the traditional benchmark tetraphenylporphyrin, H(2)tpp, permit the first estimate of ion pair association constants for singly- and doubly-oxidized free-base porphyrins. From ion titration cyclic voltammetry and digital simulation, measured association constants for H(2)tpp(+)X(-) were 65, ...

A selected solid complex of the Schiff base ligand derived from Glutaric anhydride with Cu(II) ion was synthesized and characterized by FT-IR, Electronic, ESR Spectral Analyses, Magnetic susceptibility and Molar Conductance Measurements. The disappearance of ν(O-H) hydroxyl band of the phenolic and the lowering shift of the stretching frequency of the ν(CH=N) azomethine band in the ligand after...

The mercury (II) complex, Hg (Meca2en)I2 (1), containing bidentate Schiff base ligand  Meca2en = N,N′-bis[(E)-2-benzylidenepropylidene]ethane-1,2-diamine, has been synthesized and characterized by elemental analyses (CHN) and 1H-NMR spectroscopy. The crystal structure of 1 was determined using single-crystal X-ray diffraction. Structural investigation shows that 1 crystallizes in a monoclinic s...

A novel ester-rich copolymer/ionic liquid quasi-solid-state electrolyte (SPE-IL) was designed, and dual Li-ion migration channels (“association–disassociation” with the carbonyl groups rapid ion exchange ionic liquids) were built in it.

The Tetrahymena thermophila L-21 ScaI ribozyme utilizes Mg2+ to catalyze a site-specific endonuclease reaction analogous to the first step of self-splicing. To better understand the contribution of Mg2+ to ribozyme activity, the Mg2+ concentration dependence of individual rate constants was examined at concentrations greater than those required for ribozyme folding (>2 mM; at 50 degrees C and p...

Surfactant-dye interactions are very important in chemical and dyeing processes. The dyes interact strongly with surfactant and show new spectrophotometric properties, so the UV-vis absorption spectrophotometric method has been used to study this process and extract some thermodynamic parameters. In this work, the association equilibrium between ionic dyes and ionic surfactant were studied by a...