Acid−Base Equilibrium and Electron-Ejection Processes in the Excited States ofN,N-Dimethyl-1-aminonaphthalene in Aqueous Solution

2000 ◽  
Vol 104 (48) ◽  
pp. 11270-11277 ◽  
Author(s):  
So Tajima ◽  
Seiji Tobita ◽  
Haruo Shizuka
Keyword(s):  
Aqueous Solution ◽  
Excited States ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium ◽  
Electron Ejection

Synthesis, Acid-Base Properties, Kinetics and Mechanism of Cu2+ Incorporation into Water-Soluble Highly Substituted Porphyrins

2017 ◽  
Vol 21 (09) ◽  
pp. 611-621
Author(s):  
Hirofumi Konno ◽  
Jun Takeda
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Kinetics And Mechanism ◽  
Water Soluble ◽  
Acid Base ◽  
Base Equilibrium ◽  
Absorbance Change ◽  
Acid Base Equilibrium ◽  
Kinetics Of ◽  
Base Properties

The synthesis, acid-base properties, and kinetics of Cu[Formula: see text] incorporation into water-soluble highly substituted porphyrins were studied. The basicity increased and the stepwise acid-base equilibrium was clarified by increasing the number of phenyl groups at the [Formula: see text] position, and the basicity of a dodeca-substituted porphyrin increased with the ionic strength. The metalation reaction of the dodeca-substituted porphyrin with Cu[Formula: see text] in aqueous solution revealed a biphasic absorbance change at 453 nm. Plots of [Formula: see text] or[Formula: see text] vs. the Cu[Formula: see text] concentration and of log ([Formula: see text] or[Formula: see text]/[Formula: see text] 0) vs. the ionic strength show that [Formula: see text] is dependent on the Cu[Formula: see text] concentration and ionic strength, while [Formula: see text] is independent of these parameters. These results confirm the stepwise metalation mechanism and the existence of an intermediate in aqueous solution, which is indicated by the biphasic absorbance change at 453 nm.

The Interactions with Proton-Donor Solvents and Stability of some Borondipyrrinates

2015 ◽  
Vol 1088 ◽  
pp. 386-390
Author(s):  
Rimma T. Kuznetsova ◽  
Yulia V. Aksenova ◽  
Georgii V. Mayer ◽  
E.V. Antina
Keyword(s):  
Excited States ◽  
Spectroscopic Method ◽  
Proton Donor ◽  
Quantum Yields ◽  
Acid Base ◽  
Base Equilibrium ◽  
Spectral Shifts ◽  
Acid Base Equilibrium ◽  
Franck Condon

The constants of acid-base equilibrium were estimated with spectroscopic method at the ground (S0) and at the fluorescent (S1fl) states. The constants of acid-base equilibrium for Franck-Condon excited states (S1F-C) were estimated from spectral shifts for basic and acid forms. This results are compared with quantum yields of photostability of complexes in neutral solvents. The mechanisms of complexes protonation are discussed dependence from the structure of ligands.

scholarly journals The combination of proteins, amino-acids, &c., with acids and alkalis. Part II.—Titration curves of amino-acids in presence of formaldehyde

1929 ◽  
Vol 104 (732) ◽  
pp. 412-439 ◽  
Keyword(s):  
Aqueous Solution ◽  
Amino Acids ◽  
Detailed Examination ◽  
Acid Base ◽  
Base Equilibrium ◽  
Titration Curves ◽  
Maximum Accuracy ◽  
Acid Base Equilibrium ◽  
Derivatives Of

Grounds for an Investigation. 1.A detailed examination of the acid-base equilibrium and the titration curves of amino-acids in aqueous solution has already been made (1), but data have hitherto been lacking for these solutions in the presence of formal-dehyde, i . e ., relating to the methylene derivatives of the amino-acids. 2.The addition of formaldehyde to amino-acids and the resulting increase in their acidity towards phenol phthalein (or thymol phthalein) constitutes the basis of the well-known Sørensen (“formol”) method (2) for their estimation by titration with soda; accordingly some knowledge of the acid-base constants and the titration curves of the systems in question is necessary before one can formulate the conditions (viz., the concentrations of formaldehyde and amino-acids, and the initial and final p h readings, etc.) under which this estimation may be carried out with maximum accuracy.

scholarly journals ACID-BASE EQUILIBRIUM IN THE NORMAL

1942 ◽  
Vol 144 (2) ◽  
pp. 529-535
Author(s):  
Frank C. d'Elseaux ◽  
Frances C. Blackwood ◽  
Lucille E. Palmer ◽  
Katherine G. Sloman
Keyword(s):  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

scholarly journals THE ACID-BASE EQUILIBRIUM OF THE BLOOD IN PATHOLOGICAL CONDITIONS

1931 ◽  
Vol 90 (2) ◽  
pp. 607-617
Author(s):  
Edward Muntwyler ◽  
Natalie Limbach ◽  
Arthur H. Bill ◽  
Victor C. Myers
Keyword(s):  
Acid Base ◽  
Base Equilibrium ◽  
Pathological Conditions ◽  
Acid Base Equilibrium
Sign in / Sign up

Export Citation Format

Share Document