Spectral behaviour and solvent effects of some aminoanthraquinone dyes

Safaa H. Etaiw; Morsi M. Abou Sekkina; Gad B. El-Hefnawey; Samy S. Assar

doi:10.1139/v82-046

Spectral behaviour and solvent effects of some aminoanthraquinone dyes

Canadian Journal of Chemistry ◽

10.1139/v82-046 ◽

1982 ◽

Vol 60 (3) ◽

pp. 304-307 ◽

Cited By ~ 10

Author(s):

Safaa H. Etaiw ◽

Morsi M. Abou Sekkina ◽

Gad B. El-Hefnawey ◽

Samy S. Assar

Keyword(s):

Phenyl Ring ◽

Dissociation Constants ◽

Visible Region ◽

Lone Pair ◽

Acid Dissociation ◽

Acid Dissociation Constants ◽

Effect Of Solvent ◽

Band Position ◽

Spectral Behaviour ◽

Ct Transitions

The electronic absorption spectrum of each of nineteen AAQ dyes has been studied in nine different organic solvents. The acid dissociation constants of dyes containing OH, COOH, or SO3H groups have also been determined experimentally. The spectra in ethanol display five bands in the uv region and one in the visible region (450–560 nm). This band is assigned to CT transitions of the type l–aπ which result from the interaction of the lone pair of the nitrogen atom with the phenyl ring of the carbonyl group. The CT nature of the band was supported theoretically and by the effect of solvent on band position.

The Effect of Solvent on Equilibrium and Rate Constants. II. The Measurement and Correlation of Acid Dissociation Constants of Anilinium and Ammonium Salts in the System Ethanol—Water1,2a

Journal of the American Chemical Society ◽

10.1021/ja01099a014 ◽

1953 ◽

Vol 75 (3) ◽

pp. 559-565 ◽

Cited By ~ 89

Author(s):

Boris Gutbezahl ◽

Ernest Grunwald

Keyword(s):

Rate Constants ◽

Dissociation Constants ◽

Ammonium Salts ◽

Acid Dissociation ◽

Acid Dissociation Constants ◽

Effect Of Solvent

Analyses of the Acid Dissociation Constants of Multisubstituted Diarylamines Measured in Solvents and Micellar System

Bulletin of the Chemical Society of Japan ◽

10.1246/bcsj.67.800 ◽

1994 ◽

Vol 67 (3) ◽

pp. 800-806 ◽

Cited By ~ 1

Author(s):

Ze-jian Guo ◽

Hideto Miyoshi ◽

Toshio Fujita

Keyword(s):

Dissociation Constants ◽

Acid Dissociation ◽

Micellar System ◽

Acid Dissociation Constants

ChemInform Abstract: Determination of the Acid Dissociation Constants for Some Mycotoxins of the Alternaria alternata genus.

ChemInform ◽

10.1002/chin.199852305 ◽

2010 ◽

Vol 29 (52) ◽

pp. no-no

Author(s):

P. G. MOLINA ◽

M. A. ZON ◽

H. FERNANDEZ

Keyword(s):

Alternaria Alternata ◽

Dissociation Constants ◽

Acid Dissociation ◽

Acid Dissociation Constants

Acid dissociation constants and pH values for standard “bes” and “tricine” buffer solutions in 30, 40, and 50 mass% dimethyl sulfoxide/water between 25 and −25 °C

Cryobiology ◽

10.1016/0011-2240(85)90036-7 ◽

1985 ◽

Vol 22 (6) ◽

pp. 589-600 ◽

Cited By ~ 6

Author(s):

Rabindra N. Roy ◽

James J. Gibbons ◽

Gigi E. Baker

Keyword(s):

Dimethyl Sulfoxide ◽

Dissociation Constants ◽

Acid Dissociation ◽

Acid Dissociation Constants ◽

Buffer Solutions ◽

Ph Values

Formation and Reactivity of a Porphyrin Iridium Hydride in Water: Acid Dissociation Constants and Equilibrium Thermodynamics Relevant to Ir–H, Ir–OH, and Ir–CH2– Bond Dissociation Energetics

Inorganic Chemistry ◽

10.1021/ic201553k ◽

2011 ◽

Vol 50 (21) ◽

pp. 11011-11020 ◽

Cited By ~ 24

Author(s):

Salome Bhagan ◽

Bradford B. Wayland

Keyword(s):

Dissociation Constants ◽

Acid Dissociation ◽

Equilibrium Thermodynamics ◽

Acid Dissociation Constants ◽

Bond Dissociation

Acid dissociation constants and copper chelate formation constants of thiazolylthiourea derivatives

BUNSEKI KAGAKU ◽

10.2116/bunsekikagaku.10.1122 ◽

1961 ◽

Vol 10 (10) ◽

pp. 1122-1124 ◽

Cited By ~ 1

Author(s):

Toyozo UNO ◽

Sumiyuki AKIHAMA ◽

Kuniko TERADA

Keyword(s):

Dissociation Constants ◽

Formation Constants ◽

Acid Dissociation ◽

Copper Chelate ◽

Acid Dissociation Constants ◽

Chelate Formation

Determination of Two-Steps Acid Dissociation Constants of L-Ascorbic Acid by Capillary Zone Electrophoresis

Chromatography ◽

10.15583/jpchrom.2020.024 ◽

2021 ◽

Author(s):

Yuki TANIKAMI ◽

Hitoshi MIZUGUCHI ◽

Toshio TAKAYANAGI

Keyword(s):

Ascorbic Acid ◽

Capillary Zone Electrophoresis ◽

Dissociation Constants ◽

Acid Dissociation ◽

Acid Dissociation Constants ◽

Zone Electrophoresis ◽

Capillary Zone

DISCO—a general computer program for the computation of acid dissociation constants of polyprotic molecules in water and biological fluids, from nuclear magnetic resonance data: application to polyamines

Analytical Biochemistry ◽

10.1016/s0003-2697(03)00300-2 ◽

2003 ◽

Vol 319 (2) ◽

pp. 179-194 ◽

Cited By ~ 5

Author(s):

Fabiano Reniero ◽

Claude Guillou ◽

Chiara Frassineti ◽

Stefano Ghelli

Keyword(s):

Nuclear Magnetic Resonance ◽

Dissociation Constants ◽

Biological Fluids ◽

Acid Dissociation ◽

Acid Dissociation Constants ◽

Magnetic Resonance Data ◽

Data Application ◽

Resonance Data ◽

General Computer Program ◽

General Computer

Temperature, medium and structural effects on the acid dissociation constants of certain Schiff bases derived from isatin with some amino acids and aroylhydrazines

Archives of Pharmacal Research ◽

10.1007/bf02974479 ◽

1993 ◽

Vol 16 (3) ◽

pp. 180-185

Author(s):

Aly M. A. Hassaan ◽

M. T. A. Quenawy

Keyword(s):

Amino Acids ◽

Schiff Bases ◽

Dissociation Constants ◽

Acid Dissociation ◽

Structural Effects ◽

Acid Dissociation Constants

Substituent effects on polarographic reduction of some photographic color intermediates

Canadian Journal of Chemistry ◽

10.1139/v76-170 ◽

1976 ◽

Vol 54 (8) ◽

pp. 1205-1210 ◽

Cited By ~ 3

Author(s):

Ahmad S. Shawali ◽

Bahgat E. El-Anadouli

Keyword(s):

Dissociation Constants ◽

Substituent Effects ◽

Protonated Form ◽

Acid Dissociation ◽

Polarographic Reduction ◽

Substituent Constant ◽

Acid Dissociation Constants ◽

Controlled Potential Electrolysis ◽

Half Wave ◽

Controlled Potential

Polarographic reduction of two series of benzoylacetanilides has been investigated in 40% (by volume) ethanolic Britton–Robinson buffers. One series (A) contains substituents on the anilide moiety, and the second (B) has substituents on both the anilide and benzoyl moieties. Polarographic controlled-potential electrolysis data indicate that the electroactive species in both series is the protonated form (ArCOCH2CONHAr′)H+. The reduction half-wave potentials of anilides of series A were found to be independent of the nature of the substituent, whereas those of series B show a good linear relationship when plotted vs. the σ substituent constant of the substituent on the benzoyl moiety (ρ = 0.284, r = 0.995). Values of the acid dissociation constants of the keto (K1) and enol (K2) tautomers of the anilides of series A were calculated; unlike their E1/2 values, the pK1 data show a linear correlation with the Hammett substituent constant, σ. The pK2 values show, however, little variation with σ.