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Using matrix isolation FTIR, we have observed the formation of anionic copper carbonyl complexes [Cu(CO)n] (n=1-3) following co-deposition of Cu− and counter-cations (Ar or Kr) into argon matrices doped with CO.b The infrared bands have been previously assigned in argon matrix studies employing laser ablation, however they were quite weak compared to the bands for the corresponding neutral species.c In the current study, when the deposition is carried out in fully darkened conditions at 10 K with high CO concentrations (1-2%), only the bands for the anionic complexes are observed initially via FTIR. However, upon mild irradiation with broadband visible light, the anionic bands are rapidly depleted, with concomitant appearance of bands corresponding to neutral copper carbonyl complexes. This photo-triggered neutralization is attributed to photodetachment of electrons from the anions, which then ”flow” through the solid argon matrix to recombine in the matrix with non-adjacent trapping sites. This mechanism is supported by the appearance of a new band near 1515 cm−1, assigned to the (CO)2 species in argon.d The wavelength dependence of the photodetachment will be discussed in detail, although preliminary indications are that the thresholds for the copper carbonyls, which are normally in the infrared,e are shifted into the visible region of the spectrum in argon matrices. This likely occurs because the conduction band of solid argon is known to lie about 1 eV above the vacuum level,f and thus the electron must have at least this much energy in order to escape into the matrix and find a trapping site.

CONTROLLED NEUTRALIZATION OF ANIONS IN CRYOGENIC MATRICES BY NEAR-THRESHOLD PHOTODETACHMENT