New qualitative colour reaction for the identification of copper(I) compounds and complexes.
The colour reaction of copper(I) salts and complexes, in sulphuric acid medium, with ferricyanide and ammonia, has been used for the general identification of cuprous compounds. A sulphuric acid solution of Cu(I) compound, when treated with a dilute ferricyanide solution in the presence of ammonia, gives a salmon-pink, red-pink, pink-purple or purple colour or precipitate, characteristic of copper(I). Copper(II) compounds fail to give a positive response. The reaction also forms the basis of a test for ammonium ion and differentiation between ferrocyanide and ferricyanide. The preparation of the copper(I) complex of 1-allyl-2-tetrazoline-5-thione is described.
Johar
G S
GS
Department of Chemistry Vikramajit Singh Sanatan Dharma College Kanpur 208002 (U.P.), India.
Majumdar
G
G
Dwivedi
R C
RC