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exciplex
An electronically excited complex of definite stoichiometry, 'non-bonding'
in the ground state. For example, a complex formed by the interaction of
an excited molecular entity with a ground state counterpart of a different
structure.
See also excimer.
1994, 66, 1114; see also 1996, 68, 2241
IUPAC Compendium of Chemical Terminology 2nd Edition (1997)
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What is the difference between excimer and exciplex?
An exciplex is an excited state whose wavefunction overlaps a neighboring, dissimilar molecule. In contrast to an exciplex, an excimer is an emissive excited state whose wavefunction overlaps two adjacent molecules of like composition.
What are the gases for ultraviolet radiation?
Exciplex lasers use a combination of a noble gas--argon, krypton, or xenon, with a reactive gas such as fluoride or chloride. Exciplex lasers are sometimes mistakenly referred to as "excimer" lasers, but "excited dimers" are two of the same molecule, rather than an "excited complex" of different molecules.
What is the relashionship between hydrogen bonds and polar attractions?
Abstract The emission spectra of styrene (ST)-triethylamine (TEA) systems were measured under steady-state illumination conditions in some tetrahydrofuran (THF)-protic solvent mixtures. The fluorescence spectrum of the ST-TEA system in THF consists of two bands (band A at 304 nm (fluorescence of ST) and band B at 460 nm (emission from an exciplex)). The intensity of band A increased and that of band B decreased with increasing amounts of protic solvents in THF-protic solvent mixtures. The increase in the intensity of band A was explained by the decrease in the concentration of free amine owing to the hydrogen-bonding interaction (or protonation) between TEA and protic solvents. The decrease in the intensity of band B was considered to be caused by the decrease in the concentration of free amine upon the addition of protic solvents and the enhanced conversion of the exciplex to an ion pair with increasing solvent polarity. The polar effect was expressed as a function of the relative permittivity of the solution.
