Abstract
AbstractCocrystals of N‐4‐trifluoromethylphenylphthalimides 1 a⊇2 a(1 %), composed of bromo (1 a) and dimethylamino (2 a) derivatives in a 99:1 ratio, display delayed photoluminescence (DPL) at λem=535 nm with a lifetime of 0.26 s. In contrast, pure materials 1 a and 2 a do not exhibit DPL. Similar DPL emission is also observed for cocrystals 1⊇2(1 %) of N‐4‐pyridyl, N‐phenyl, and N‐4‐tolyl derivatives. X‐Ray crystallographic analyses and the results of density functional theory calculations revealed that key for the occurrence of DPL is the formation of charge‐transfer (CT) excited states 1(2 a⋅1 a)CT* and the existence of regularly aligned networks in the cocrystals, which leads to generation of the long‐lived excited state 31 a via 3(2 a⋅1 a)CT* by intersystem crossing and localization of triplet energy.
Published Version
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