Abstract
Amyl alcohol solutions of the bis(2,2'-biquinoline)copper(I) cation, I, react with single-crystal, n-type CdS to yield n-CdS/p-Cu/sub 2/S heterojunctions. The intense visible absorption band of I (lambda/sub max/ 545 nm; epsilon approx. 6300 M/sup -1/ cm/sup -1/ at 25/sup 0/C) provides an in situ spectrophotometric probe of heterojunction formation: spectral changes can be correlated with the extent of reaction. Kinetic studies using the nitrate salt of I reveal that initial reaction rates are directly proportional to CdS macroscopic surface area, first order in the concentration of I, and temperature dependent with an apparent activation energy of 13 +- 2 kcal/mol between 60 and 90/sup 0/C. Mechanistic aspects of the reaction are discussed.
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