CADMIUM (5 P-3(1)-PHOTOSENSITIZED LUMINESCENCE OF SOME COMPOUNDS CONTAINING 2 FUNCTIONAL-GROUPS

The cadmium (5P-3(1))-sensitized luminescence of some aliphatic compou nds which have two functional groups have been studied under the condi tions of steady-state illumination at temperatures between 473 and 573 K. It was found that 1,2-dimethoxyethane (DMOE), 2-methoxyethylamine (2-MOEA), and 3-methoxypropylamine (3-MOPA) have two emission bands (w avelengths at the peaks of these bands are about 400 and 455 nm for DM OE and about 460 and 500 nm for 2-MOEA and 3-MOPA), while 2-aminoethan ol (2-AEA) and 3-amino-1-propanol (3-APA) do not have any emission ban d. These two bands were assigned to two kinds of 1: 1 exciplex (cyclic and acyclic ones) between an excited cadmium atom and a substrate mol ecule. From the temperature dependence of the emission intensity ratio s of these bands, the enthalpy changes (DELTAH-degrees) of the equilib rium between two exciplexes were evaluated. The values of DELTAH-degre es are correlated to the energy differences between the wavelengths of two emission bands.