A shift towards longer wavelengths (lower energy) in the absorption or emission spectrum of a molecule, caused by a decrease in the energy difference between the electronic states involved.
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7-tert-Butoxy-2-(2-chloro-2,3-diphenyl-cyclopropyl)-bicyclo[4.4.1]undeca-1(10),2,4,6,8-pentaene
3-(4-nitro-benzyl)-5,5-diphenyl-imidazolidine-2,4-dione
ALUMINUM 1 4 8 11 15 18 22 25-OCTABUTOX&
