As the number of fused rings in the ligand of the cuprous organoacetylenides with the general formula ArC≡CCu, where Ar may be phenyl, α-naphthyl, β-naphthyl, or 9-anthracenyl, is increased, there is a tendency toward a bathochromic shift in the absorption, photoconductivity, and photoelectromotive-force spectra. Para substituents in the phenyl ring cause increasing bathochromic shifts in the absorption maxima along the series CH3 < H < Cl < I < COCH3 < NO2.
The photoeleetromotive-force spectra are similar to the absorption spectra, and the principal photoconductivity maximum is located on the edge of the absorption band.
The photoconductivities determined from the absorption spectra and the energies of the forbidden gaps determined from the photoelectromotive-force spectra correlate well with each other. This indicates that the conductivity of the cuprous organoacetylenides is intrinsic. The p type of the photocurrent carrier has been established.
The nature of the spectra of the cuprous organoacetylenides as a function of the method of construction has been discussed, and the decisive role of the steric factors in the migration of the photocurrent carriers has been shown.
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Myl'nikov, V.S., Gol'ding, I.R. & Sladkov, A.M. Effect of aromatic substituents on the absorption spectra, photoconductivity, and photoelectromotive force of cuprous organoacetylenides. Russ Chem Bull 25, 311–315 (1976). https://doi.org/10.1007/BF00922464
- Absorption Spectrum
- Absorption Band
- Absorption Maximum