Chemistry: physical processes – Physical processes – Crystallization
Patent
1975-05-05
1977-03-22
Yudkoff, Norman
Chemistry: physical processes
Physical processes
Crystallization
23230M, G01N 3100, G01N 3122
Patent
active
040134148
ABSTRACT:
A novel class of soluble organic nitrogen compounds which produces various colors when dissolved in organic liquid solvents. These dyes produce a color from blue to red if the organic liquid medium has a neutral or basic pH which reversibly changes to yellow if the liquid medium has an acid pH. The color variation can also serve as an indication of solvent polarity.
REFERENCES:
patent: 3490874 (1970-01-01), Ando et al.
patent: 3576815 (1971-04-01), Doyle
patent: 3706537 (1972-12-01), Becher et al.
Brooker, L.G.S.; Keyes, G. W. & Heseltine, D. W.; Color and Constitution XI Anhydronium Bases of Phydroxystyryl Dyes as Solvent Polarity Indicators; Journal of the American Chemical Society, vol. 73, pp. 5350-5356; 1951.
Hawley, Gessner G.; The Condensed Chemical Dictionary 8th ed.; pp. 249-250; 1971.
Gaines, Jr. George L.
Lavallee Francois A.
LeGrand Donald G.
General Electric Company
Kempton Lawrence R.
Lovercheck Dale
McDevitt John F.
Neuhauser Frank L.
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