Cupferron
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Cupferron is jargon for the ammonium salt of the conjugate base derived from N-nitroso-N-phenylhydroxylamine. This conjugate base is abbreviated as CU−. It once was a common reagent for the complexation of metal ions, being of interest in the area of qualitative inorganic analysis. Its formula is NH4[C6H5N(O)NO]. The anion binds to metal cations through the two oxygen atoms, forming five-membered chelate rings.
Synthesis and complexes
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Cupferron is prepared from phenylhydroxylamine and an NO+ source:[1]
- C6H5NHOH + C4H9ONO + NH3 → NH4[C6H5N(O)NO] + C4H9OH
Being a bidentate mono-anionic ligand, CU− forms complexes analogous to those produced with acetylacetonate. Illustrative complexes include Cu(CU)2, Fe(CU)3, and Zr(CU)4.[2][3][4]