Abstract
Invited for the cover of this issue are Dietmar Stalke and coworkers from the Georg-August Universität at Göttingen. The image symbolizes the organization of small arenes in the pocket of thiophosphoranyl substituted anthracene like the construction of a stable wall from a loose pile of bricks, shifting the emission to the green and amplifying it by a factor of five. Read the full text of the article at 10.1002/chem.202003017.
Highlights
Organic luminescent solid-state materials have spawned great interest in fundamental research and various applications over the last two decades
The low quantum yields can be explained by a photoinduced electron transfer (PET) from the sulfur lone pairs towards the anthracene psystem, which leads to a strong fluorescence quenching
The two phenyl groups are both located at the same side of the anthracene plane and the bulky substituent induces a strong butterfly bent structure of the anthracene core
Summary
Organic luminescent solid-state materials have spawned great interest in fundamental research and various applications over the last two decades. Type interaction usually follows a bathochromic shift of the emission and extends fluorescence’ lifetimes.[26] Exciplex emission can be obtained by host–guest complexes or supramolecular assemblies.[27] Face-to-face interactions of the host molecule and suitable guests can tune the emission wavelengths and effectiveness via a Charge-Transfer (CT) or exciplex mechanism.[28] Some of these systems show interesting vapochromic behaviour and are potential candidates for chemical sensing of volatile, organic compounds.[6,29] One of the first sensors for toluene based on a host–guest system we reported in 2003.[30] The unusual photophysical properties of a disubstituted diphenyl(thiophosphoranyl) anthracene revealed a reversible intense green emission upon co-crystallisation with toluene and a nearly complete fluorescence quenching when the toluene was removed under reduced pressure.
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