Some Observations Upon the Relation Between Absorption Spectra and Constitution of Certain Acid Anthraquinone Dyes

A convenient and efficient process for the manufacture of benzenesulfonic acid, 2-((4-amino-3-bromo-9,10-dihydro-9,10-dioxo-1-anthracenyl)amino)-5-methyl monosodium salt (C.I. Acid Blue 78) directly from anthraquinone

“…Acid Blue 78 (2.59 g, 0.0053 mol) was obtained (yield 89.2% relative to 2-bromo-4-p-toluidinoanthraquinon-1-amine The colouristic properties of the final product are the same as the previously published data about C.I. Acid Blue 78 [8,9].…”

Titrimetric and Equilibrium Studies Using Indicators Related to Nile Blue A.

“…This is illustrated for dioxane-water mixtures in any significant extent, strong acids are required. The following are examples of sufficiently strong acids (the solvent used is indicated in parentheses): (1) Perchloric acid (acetic acid); (2) dcamphorsulfonic acid (benzene); (3) diphenyl phosphate (acetonitrile). In oxazone, the first "limiting curve" seemed to have been reached on the addition of 6.2 equivalents of perchloric acid.…”

“…Although strict compliance with rules would dictate the use of systematic nomenclature for purified specimens of the indicators, trivial names being applied only to unpurified materials or those containing deliberately added impurities, this is much too cumbersome for common usage. In correspondence with the manufacturer (12) of most of the purified salts and anhydro-bases used in the experiments agreement was reached to apply trivial names to the pure materials according to the following plan: (1) Trivial names previously in use (for example, for Compounds 2a and 3a) were to be retained.…”

Effect of the Substitution Pattern of Diaminoanthraquinone on Some Physical Properties

“…3a and 3b. In the case of 1,4-DAAQ, two peaks are clearly resolved in this energy domain, which has been attributed (23) to the mesomeric effect present in this molecule (Fig. 9).…”

“…For XPS measurements the broadening of the O1s and N1s signals cannot be easily attributed to the charge density fluctuations on the nitrogen and the hydrogen atoms, fluctuations related to the hydrogen bond and the mesomeric effect present in the 1,4-DAAQ molecule (23) (Fig. 9).…”