The electronic spectra, luminescent properties, and photoreactivity of the title compound, DPPO, have been investigated in several chemical environments. Solutions which are 0.5 to 100 mM DPPO in CH2C12 at 295 K emit efficiently with a quantum yield, , of ~0.1-0.2. Over this same concentration range, DPPO also undergoes a [2 + 2] cycloaddition reaction, likely from a different excited state, with a disappearance quantum yield, , which increases from ~0.01 to 0.08. The sensitivity of these excited-state properties to environment is demonstrated by the effects of adduct formation with lanthanon(III) d-diketonate complexes, Ln(fod)3 (Ln
Untersucht werden die Elektronenspektren, die Lumineszenzeigenschaften und die Photoreaktivität der im Titel genannten Verbindung (I) in unterschiedlicher chemischer Umgebung (in CHZCIZ, in Gegenwart von β‐Diketonatkomplexen von Lanthaniden Ln(fod)3 (III), Adsorption an Silicagel).
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