KINETIC ANALYSIS OF THE ABNORMAL FLUORIMETRlC TITRATION GERAVlOUR OF NAPHTHYLAMINES
نویسنده
چکیده
The fluorimetric titration behaVIOur of naphthylammes IS abnormal In that the sum of the reduced quantum yields of conjugated aCid and base passes through a minimum. Based on fluorescence quantum yield and I1fetime measuremc'lts, we e....plaln thiS behaVIOur by two Independent mechamsms: A dlabatlc quenching of the excltcd base by protons and a decrease of the e....clted cation's protolytlc diSSOCiation ID the hyperacldlc rcgion. Though apparently mdependent processes, thCIr rate constants can be shown to be related to each other by a quasl-thermodynanucal equation.
منابع مشابه
Biological Applications of Isothermal Titration Calorimetry
Most of the biological phenomena are influenced by intermolecular recognition and interaction. Thus, understanding the thermodynamics of biomacromolecule ligand interaction is a very interesting area in biochemistry and biotechnology. One of the most powerful techniques to obtain precise information about the energetics of (bio) molecules binding to other biological macromolecules is isoth...
متن کاملCarbon Dioxide Capture by Modified UVM-7 Adsorbent
In this study, bimodal meso-porous silica (UVM-7) synthesized and fabricated amino silane modified supports were characterized by powder X-ray diffraction (XRD), N2 adsorption/desorption, transmission electron microscope (TEM), elemental analysis and titration. Capacity of CO2 capture on modified bimodal pore structure silica at 70°C was calculated using breakthrough curves; and it was found th...
متن کامل"Kinetic NMR titration": including chemical shift information in the kinetic analysis of supramolecular reaction systems such as organic replicators.
Efficient harvesting of kinetic and thermodynamic information in supramolecular reaction systems comes from kinetic NMR titration, that is, the combined analysis of NMR integrals and chemical shifts. The method is introduced using a minimal self-replicating system studied at various temperatures.
متن کاملpH Dependence Study of the Kinetic Reaction of Bovine Carbonic Anhydrase with 2,2'-Dithiobispyridine in the Absence and Presence of Surfactants
The pH dependence study reveals that the Cys 206 sulphydryl group of bovine carbonicanhydrase in the native form is not exposed. During the reaction of 2,2'-dithiobispyridine (2-DTP) with the enzyme, there was no absorbance change recorded. In the presence ofsurfactants, the pH dependence profiles of the apparent second order rate constants, kapp, forthe reaction of 2-DTP with bovine carbonic a...
متن کاملKinetic Study of Graft Polymerization of Acrylic Acid and Ethyl Methacrylate onto Starch by Ceric Ammonium Nitrate
Graft polymerization of acrylic acid (AA) and ethyl methacrylate (EMA) onto starch (St) were carried out in aqueous solution using ceric ammonium nitrate (CAN) as redox system under N2 atmosphere. The effect of pH, reaction time, temperature, concentrations of CAN, St, and monomers on the graft yield was investigated. Monomer reactivity was in the following order: AA>EMA.<em...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001