Determination of acid-base equilibrium constants in the excited state

1979 ◽  
Vol 31 (4) ◽  
pp. 1317-1319
Author(s):  
L. M. Rubeko ◽  
B. M. Uzhinov
Keyword(s):  
Excited State ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

scholarly journals Determination of Acid-Base Equilibrium Constants on Aqueous Mesoporous Silica Surfaces

2010 ◽  
Vol 26 (08) ◽  
pp. 2109-2114 ◽  
Author(s):  
ZHANG Wei-Min ◽  
◽  
YANG Zhen-Dong ◽  
LIU Jia ◽  
SUN Zhong-Xi
Keyword(s):  
Mesoporous Silica ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Silica Surfaces ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

Acid−Base Equilibrium Constants and Distribution Coefficients of Aminopyrene between the Surface and Bulk of Liquid Water as Studied by a Laser Two-Photon Ionization Technique

2004 ◽  
Vol 108 (32) ◽  
pp. 12111-12115 ◽  
Author(s):  
Miki Sato ◽  
Akira Harata ◽  
Yoshihiko Hatano ◽  
Teiichiro Ogawa ◽  
Takeshi Kaieda ◽  
...  
Keyword(s):  
Liquid Water ◽  
Equilibrium Constants ◽  
Distribution Coefficients ◽  
Acid Base ◽  
Ionization Technique ◽  
Two Photon ◽  
Base Equilibrium ◽  
Acid Base Equilibrium ◽  
Photon Ionization

Excited state acid–base equilibrium of tyrosine

1978 ◽  
Vol 56 (9) ◽  
pp. 1238-1245 ◽  
Author(s):  
David Michael Rayner ◽  
Donald Theodore Krajcarski ◽  
Arthur Gustav Szabo
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Quantum Yields ◽  
Acid Base ◽  
Large Shift ◽  
Fluorescence Quantum Yields ◽  
Base Equilibrium ◽  
Tyrosine Fluorescence ◽  
Acid Base Equilibrium ◽  
Buffer Base

Fluorescence attributable to the tyrosinate form of the amino acid tyrosine, previously only observed at pH > pK(S0) = 10.3 where tyrosinate exists in the ground state, has been observed at neutral pH in the presence of high buffer base concentrations. This observation is consistent with the large shift in pK(Sl) predicted from absorption measurements and confirms that proton transfer is indeed a mechanism by which carboxylate ions quench tyrosine fluorescence. The dependence of the fluorescence quantum yields of tyrosine and tyrosinate on pH does not fit a simple excited state acid–base equilibrium model but a more complicated system where carboxylate is also capable of simultaneously quenching tyrosine fluorescence by a mechanism not involving proton transfer. Kinetic analysis of the system allows calculation of pK(S1) = 4.2 for tyrosine. The quantum yield of tyrosinate fluorescence can be appreciably higher than that normally measured at alkaline pH where a separate quenching mechanism must operate. These results have significance in the interpretation of the fluorescence properties of proteins.

13C NMR measurements of acid-base equilibrium constants in alkaline aqueous solutions of D-glucose anomers

2006 ◽  
Vol 80 (10) ◽  
pp. 1680-1682 ◽  
Author(s):  
K. I. Popov ◽  
N. M. Sultanova ◽  
H. Rönkkömäki
Keyword(s):  
Aqueous Solutions ◽  
13C Nmr ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium ◽  
Glucose Anomers

Measurement of acid-base equilibrium constants in acetonitrile/18-crown-6 solutions

1983 ◽  
Vol 55 (13) ◽  
pp. 2184-2186
Author(s):  
Ildiko M. Kovach
Keyword(s):  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

Acid−Base Equilibrium Constants for Glycine in NaClO4, KCl, and KBr at 298 K. Dependence on Ionic Strength

1998 ◽  
Vol 43 (5) ◽  
pp. 876-879 ◽  
Author(s):  
P. Alonso ◽  
J. L. Barriada ◽  
P. Rodríguez ◽  
I. Brandariz ◽  
M. E. Sastre de Vicente
Keyword(s):  
Ionic Strength ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium ◽  
Dependence On Ionic Strength

Temperature dependence of the acid–base equilibrium constants of substituted pyridine N-oxides in acetonitrile

1999 ◽  
Vol 477 (1-3) ◽  
pp. 113-118 ◽  
Author(s):  
Ewa Kaczmarczyk ◽  
Roman Wróbel ◽  
Adam Liwo ◽  
Lech Chmurzyński
Keyword(s):  
Temperature Dependence ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium

The acid-base equilibrium constants of 1,2,3,4-tetrahydro-8-oxyquinoline in aqueous solution

2007 ◽  
Vol 81 (4) ◽  
pp. 556-559
Author(s):  
L. M. Ramenskaya ◽  
V. V. Zhandarev
Keyword(s):  
Aqueous Solution ◽  
Equilibrium Constants ◽  
Acid Base ◽  
Base Equilibrium ◽  
Acid Base Equilibrium
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