Photoelectric Emission and Electrical Conductivity of the Cesium Complex with Pyrene Derivatives

Abstract

On the basis o the charge transfer process of the complexes, the photoemission and the electronic conduction of the complexes between cesium and pyrene derivatives, tetranitropyrene (TNO2P), tetrachloropyrene (TClP), tetrabromopyrene (TBrP) and tetracyanopyrene (TCNP) have been measured. A strong increase in the quantum yield of photoemission, from 10−3–10−4 to 10−1–102, resulting from the formation of the complexes, has been found. The promotion may take place by means of an electron transfer from cesium metal to a partner molecule; [Cs+] [Aromatics−]. The assumption is supported by the findings concerning electron spin resonance absorption and charge-transfer spectra.The electrical resistivity of the complexes, ρ at 15°C of pyrene-Cs=2.1×104 Ωcm., (TClP)-Cs=8Ωcm., (TBrP)-Cs=1.6×101 Ωcm., (TNO2P)-Cs=2×106 Ωcm. and (TCNP)-Cs=6×105 Ωcm., is strongly affected by the contribution of the, dative-bond character of the complexes.