CD-4 (N-Ethyl-N-hydroxyethyl-3-methyl-1,4-phenylenediamine sulfate, 4- (N-ethyl-N 2 -hydroxyethyl) -2-methylphenylenediamine sulfate) is an organic compound with the formula C 11 H 20 N 2 O 5 S [1] . Used as a color developing substance of the paratoluylene diamine series in photography. CD-4 is a trade name used by Kodak and is short for Color Developing Agent 4 (color developing agent 4).
| Cd-4 | |
|---|---|
| Are common | |
| Chem. formula | C 11 H 20 N 2 O 5 S |
| Physical properties | |
| Molar mass | 292.35 g / mol |
| Chemical properties | |
| Solubility in water | soluble |
| Classification | |
| Reg. CAS number | |
| PubChem | |
| Reg. EINECS number | |
| Smiles | |
| Inchi | |
Trade names: CD 4 ( Kodak , USA), 21D ( Fujifilm , Japan), Color Developer 4 ( Merck KGaA , Germany) [2] .
Content
History
The substance was first described in the patent of the German company Agfa [3] .
Physical and chemical properties
The molar mass is 292.35 g / mol [1] .
CD-4 refers to paratoluylenediamine derivatives [4] . Like other colored paratoluene diamine-type developing substances ( CD-2 , CD-3 , CD-6 ), the methyl group in the ortho position to the amino group that binds to the color-forming component is designed to facilitate the transfer of the electron by the developing substance to the silver ion, which increases activity and reduces manifestation time [5] .
The substance is used in the form of a sulfate salt, which is due to the fact that all derivatives of p-phenylenediamine in the form of a base are easily oxidized by atmospheric oxygen, and in the form of salts they have better solubility in alkaline aqueous solutions and relative chemical stability [6] .
Application
It is used as a highly active developing substance in the processing of color negative films Kodak, Agfa, Fujifilm . Used in the C-41 process [2] , it can be used in amateur recipes of the E-6 process as a substitute for the developer of CD-3 [4] .
Security
Allergen, causes skin irritation [7] .
Notes
- ↑ 1 2 NIH .
- ↑ 1 2 Redko, 2006 , p. 900.
- ↑ Rogers, 2007 , p. 48.
- ↑ 1 2 Shadrin, 1992 , p. 15.
- ↑ Hunt, 2009 , p. 362.
- ↑ Hunt, 2009 , p. 362-363.
- ↑ Lepoittevin, 2007 , p. 64.
Literature
- Redko A.V. Chemistry of Photographic Processes. - SPb. : NPO Professional, 2006. - S. 837-954. - 1464 s. - (New reference book of a chemist and technologist / ed. A. Moskvin; issue. General information. The structure of the substance. Physical properties of the most important substances. Aromatic compounds. Chemistry of photographic processes. Nomenclature of organic compounds. Laboratory work technique. Fundamentals of technology.).
- Hunt R.V. G. Color reproduction / trans. A.E. Shadrin. - 6th ed .. - St. Petersburg. , 2009 .-- 887 p.
- Shadrin AE Process E-6: laboratory processing of color reversible films of the Ektahrom type . - SPb. : Tuscarora, 1992 .-- ISBN 5-89977-008-2 .
- Lepoittevin J.-P., Le Coz C. Dictionary of Contact Allergens . - Springer, 2007.
- Rogers D. The Chemistry of Photography. - RSC Publishing, 2007.
Links
- Kodak CD 4 PubChem . Nih. Date of treatment June 8, 2017.