Details

Autor(en) / Beteiligte

• Li, Bin
• Cui, Lei
• Li, Chunju

Titel

Macrocycle Co‐Crystals Showing Vapochromism to Haloalkanes

Ist Teil von

• Angewandte Chemie International Edition, 2020-12, Vol.59 (49), p.22012-22016

Auflage

International ed. in English

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Organic co‐crystal engineering is a promising method to make multifunctional materials. Here, the marriage of macrocyclic chemistry and co‐crystal engineering provides a smart strategy to build vapochromic materials. The macrocycle co‐crystals (MCCs) were constructed from π‐electron rich pillar[5]arene (P5) and an electron‐deficient pyromellitic diimide derivative (PDI) on a 10 g scale. MCCs of P5‐PDI are in red owing to the formation of a charge‐transfer (CT) complex. After solvent removal, a white crystalline solid with a new structure (P5‐PDIα) is yielded, which exhibits selective vapochromic responses to volatile organic compounds (VOCs) of haloalkanes, accompanied by color changes from white to red or orange. Powder and single‐crystal X‐ray diffraction analyses reveal that the color changes are attributed to the vapor‐triggered solid‐state structural transformation to form CT co‐crystals. Coating films of P5 and PDI on glass showed a visible vapochromic behavior with good reversibility. A smart strategy to build functional materials was designed through the marriage of macrocyclic chemistry and co‐crystal engineering. The resulting macrocycle co‐crystals (MCCs), P5‐PDIα exhibit selective vapochromic responses to volatile organic compounds of haloalkanes, accompanied by color changes from white to red or orange and vapor‐triggered solid‐state structural transformation to form charge‐transfer co‐crystals.