The Quenching of the Cadmium Resonance Radiation at 326.1 nm by Some Aliphatic Amines and the Cadmium-sensitized Luminescence of These Amines

Abstract

Abstract From the pressure dependence of the intensity of the 326.1 nm resonance line, the efficiencies of the quenching of the resonance line by methylamine, ethylamine, n-propylamine, n-butylamine, sec-butylamine, tert-butylamine, diethylamine, and triethylamine were estimated to be 14.2, 36.0, 58.6, 71.2, 116.7, 434.5, 69.6, and 66.0 respectively, the efficiency of ammonia being assumed to be unity. The relative values of rate constants for the formation of excited complexes between the excited cadmium atoms and the amines, and the wavelengths at the peaks of the emission bands from the complexes, were measured. The quantum yields of luminescence were also measured by comparing the integrated intensities of the emission bands with the decrease in the intensities of the resonance line at 326.1 nm upon the addition of amines. From the relationship between these values and the structure of the amines, it is concluded that the complexes are of the charge-transfer type.