THE RELATION BETWEEN THE ABSORPTION SPECTRA AND THE CHEMICAL CONSTITUTION OF DYES. XXI. SOME EFFECTS OF NON-COPLANARITY ON THE ABSORPTION SPECTRA OF UNSYMMETRICAL DISAZO BENZIDINE DYES.

1948 ◽  
Vol 13 (2) ◽  
pp. 200-207 ◽  
Author(s):  
WALLACE R. BRODE ◽  
ROBERT J. MORRIS
Keyword(s):  
Absorption Spectra ◽  
Chemical Constitution

I. Preliminary notice of experiments concerning the chemical constitution of saline solutions

1874 ◽  
Vol 22 (148-155) ◽  
pp. 241-243
Keyword(s):  
Absorption Spectra ◽  
Saturated Solution ◽  
Chemical Action ◽  
Chemical Constitution ◽  
Copper Chromium ◽  
Saline Solutions ◽  
Cobalt Copper

The author has been engaged in investigating the above subject during the last eighteen months, and his experiments being still in progress, he thinks it desirable to place the following observations on record. In the examination of the absorption-spectra, as seen in wedge-shaped cells, of the principal salts of cerium, cobalt, copper, chromium, didymium, nickel, palladium, and uranium, to the number of nearly sixty different solutions, it was noticed that the properties of the substances in regard to changes of colour could be ascertained by noticing the absorption-curves and bands, so that, provided water be without chemical action, it could be foreseen what change would occur on dilution of a saturated solution.

scholarly journals A comparison of the absorption spectra of some typical unsymmetrical cyanine dyes

1937 ◽  
Vol 163 (912) ◽  
pp. 138-155 ◽  
Keyword(s):  
Absorption Spectra ◽  
Absorption Maximum ◽  
Cyanine Dyes ◽  
Alcoholic Solution ◽  
Maximum Absorption ◽  
Chemical Constitution ◽  
The Mean

A study has recently been made of the absorption spectra of eleven series of typical symmetrical cyanine dyes; each series comprised, in general, four members, in which two similar heterocyclic nuclei were linked by one, three, five, and seven methenyl groups (Fisher and Hamer 1936). The correlation of frequencies of maximum absorption with changes in chemical constitution proved so interesting that it seemed desirable to extend our work to other series of cyanine dyes, having two dissimilar, instead of two similar, nuclei. The object, with which we set out, was to combine each of the nuclei already studied with every other one, in order to ascertain how exactly the absorption maximum of each unsymmetrical cyanine thus obtained is the mean of those of the two related symmetrical dyes. That it is approximately the mean has been often accepted as axiomatic. For instance, Mills and Odams (1924) considered the structure of their new 2 : 4´-carbocyanine to be confirmed by the fact that its absorption maximum was intermediate in position between those of the 2 : 2´- and 4 : 4´-carbocyanines. As before, ethiodides were selected for the study, and our aim was to examine purified specimens of the compounds, under standard conditions, in methyl alcoholic solution.

scholarly journals XXI.—The relation between absorption spectra and chemical constitution. Part XIII. Some pyrones and allied compounds

1909 ◽  
Vol 95 (0) ◽  
pp. 144-158 ◽  
Author(s):  
Edward Charles Cyril Baly ◽  
John Norman Collie ◽  
Herbert Edmeston Watson
Keyword(s):  
Absorption Spectra ◽  
Chemical Constitution

Chemical Constitution of Vitamin B1 as deduced from Ultra-Violet Absorption Spectra

Nature ◽  
1934 ◽  
Vol 134 (3386) ◽  
pp. 461-461 ◽  
Author(s):  
FRANCIS F. HEYROTH ◽  
JOHN R. LOOFBOUROW
Keyword(s):  
Absorption Spectra ◽  
Vitamin B1 ◽  
Ultra Violet ◽  
Chemical Constitution
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