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1-(2-Pyridylazo)-2-naphthol CAS 85-85-8
Orange red amorphous powder. Melting point 141 ℃, soluble in methanol, ethanol, benzene, ether, chloroform and hot dilute alkali solution, insoluble in water. The solution is pink above pH12, orange red in weak acid and purple in concentrated sulfuric acid. Its metal complex is pink or red.
Orange red amorphous powder,Soluble in methanol, ethanol, benzene, ether, chloroform and hot alkali liquor, insoluble in water.when the pH of solution more than 12,it is pink.In the weak acid orange red,Purple in sulfuric acid,The metal complex are pink or red.
Metal indicator and the spectral analysis of transition metal reagents. Embodied in: used for photometric method and extraction spectrophotometry and fluorescence spectrophotometry Al3 +, Sb3 + and Cd2 +, Zn2 +, Co2 +, Cu2 + and Ga3 +, In3 +, Fe3 +, Pd 2 + metal ions such as chromogenic agent. And used for determination of EDTA coordination titration Bi3 + and Ga3 +, In3 + and Ni2 +, Cu2 +, Ce3 +, such as metal indicator, also used for trace metal precipitant, used to capture titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc and lead, etc trace trace metals.
2.Metal indicator and the spectral analysis of transition metal reagents.Specific performance:Used for photometric method and extraction spectrophotometry and fluorescence spectrophotometry Al3+, Sb3+ and Cd2+, Zn2+, Co2+, Cu2+and Ga3+, In3+, Fe3+, Pb2+ metal ions such as chromogenic agent.Also used for trace metal precipitant.Is used to capture titanium, vanadium, manganese, iron, cobalt, nickel, copper, zinc and lead, etc trace trace metals.
Methods of production:
By 2 - aminopyridine after diazotization, and 2 - naphthol coupling. Anhydrous ethanol will react with sodium metal to produce ethanol, sodium 2 - aminopyridine ethanol solution, then add the ventilation with ethyl nitrite steam for 45 to 50 ℃. 8 hours to finish, thermal insulation, filter the diazonium salt washing with ether. Add the diazonium salt in the ethanol solution of 2 - naphthol, on the carbon dioxide for 45 to 50 ℃ access coupling reaction, filter out crystallization after 6 hours, reoccupy after washing with distilled water ethanol recrystallization, drying is the finished product.
Dangerous code: Xi
The level of danger: R36/37/38
Security level: S26-36
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