Abstract
Abstract The cadmium (53P1)-sensitized luminescence of some aliphatic compounds which have two functional groups have been studied under the conditions 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 (wavelengths at the peaks of these bands are about 400 and 455 nm for DMOE and about 460 and 500 nm for 2-MOEA and 3-MOPA), while 2-aminoethanol (2-AEA) and 3-amino-1-propanol (3-APA) do not have any emission band. These two bands were assigned to two kinds of 1 : 1 exciplex (cyclic and acyclic ones) between an excited cadmium atom and a substrate molecule. From the temperature dependence of the emission intensity ratios of these bands, the enthalpy changes (ΔH°) of the equilibrium between two exciplexes were evaluated. The values of ΔH° are correlated to the energy differences between the wavelengths of two emission bands.
Published Version
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