Iodocuprate(I) complexes in aqueous solutions luminesce when excited in the UV region (275–290 nm), emitting in the visible region (λmax = 493 nm), with a very short lifetime of about 14 ns which is independent of ligand concentration in the range 1–5 M iodide ion. Luminescence quenching by H+ follows a Stern-Volmer relationship. Photolysis into the UV absorption band also produces hydrated electrons, which decay through scavenging by iodocuprate(I) itself or through recombination with the Cu(II) species formed in the primary step, similarly to the chloro- and bromocuprates(I). Also observed was the time-resolved spectrum of the transient I2−, which is apparently formed by reaction of the iodide ion with Cu(II) formed in the primary electron ejection step. The rate constant for the formation of I2− in 1 M NaI is estimated to be 4.4 × 107 s−1.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry