Formation and photoinduced electron ejection of amminedicyanocuprate(I) and cyano-bridged trinuclear copper(I) complexes in aqueous ammonia solution.

UV absorption spectral evidence confirms that a mixed-ligand complex, Cu(CN)(2)(NH(3))(-), is formed in an aqueous solution of KCu(CN)(2) and ammonia. The stepwise stability constant for the reaction, Cu(CN)(2)(-) + NH(3) = Cu(CN)(2)(NH(3))(-), is 2.80 +/- 0.