Abstract
A molecule that has distinct fluorescence properties that are dependent on the environment of the sample has emerged as a basis of the environment-responsive luminescent materials. In their Communication on page 122 ff., Shigehiro Yamaguchi and co-workers designed and synthesized 2-(o-hydroxyphenyl)-substituted benzophosphole oxides, which can form an intramolecular hydrogen bond between the hydroxy group and the phosphine oxide moiety. A 3-phenylated derivative fluoresces in several specific solvents that have hydrogen-bond-accepting abilities, whereas it is virtually non-emissive in toluene, CH2Cl2, and MeCN. Switching of the hydrogen bonds can be a mechanism for controlling the fluorescence properties of phosphole-oxide-based π-electron systems.
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