Donor–π–Acceptor (D–π–A) type molecules including dithiafulvene (DTF) moiety as a donor group and 4-cyano-5-dicyanomethylene-2-oxo-3-pyrroline (CDCOP) moiety as an acceptor group were synthesized in modest yields and showed intramolecular charge transfer (ICT) in the solution state. The intramolecular S⋯O interactions stabilize the planar conformation of π-electronic systems, and the solid-state assemblies based on π-π stackings were obtained. Furthermore, the N-free derivative bearing the (dimethylamino)phenyl substituent formed solid-state helical structures through hydrogen-bonding and steric effect.

中文翻译：

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具有含硫杂环供体和吡咯啉型受体的染料的合成

合成了供体-π-受体（D-π-A）型分子，其中包括噻硫磷（Dthiafulvene）（DTF）部分作为供体基团和4-氰基-5-二氰基亚甲基-2-氧代-3-吡咯啉（CDCOP）部分作为受体基团产量适中，并在溶液状态下显示出分子内电荷转移（ICT）。分子内的S⋯O相互作用稳定了π电子系统的平面构象，并获得了基于π-π堆积的固态组装体。此外，带有（二甲基氨基）苯基取代基的无N衍生物通过氢键和空间效应形成固态螺旋结构。