title: Vapochromic Behavior of a Chair-Shaped Supramolecular Metallacycle with Ultra-Stability.
abstract: A new discrete supramolecular metallacycle functionalized with an alkynylplatinum(II) bzimpy moiety was successfully prepared via coordination-driven self-assembly, and it displayed a reversible color change in the solid state between yellow and red, triggered by CH2Cl2 vapor or mechanical grinding. Notably, unlike many known vapochromic systems, the obtained vapochromic metallacycle exhibits ultra-stability, with the red color remaining unchanged in air for several months at room temperature or even under vacuum for >1 week. Further investigation revealed that the chair conformation of the metallacyclic scaffold, which was thought to prevent intermolecular steric repulsion between the alkyl chain and triethylphosphine, favored close molecular stacking through intermolecular Pt···Pt and π-π stacking interactions, thus allowing such vapochromic behavior with ultra-stability.
authors.forename: Bo
authors.initials: B
authors.lastname: Jiang
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Beijing Normal University , Beijing 100050, P. R. China.
authors.forename: Jian-Qiu
authors.initials: JQ
authors.lastname: Ma
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Chen
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.forename: Chao
authors.initials: C
authors.lastname: Li
authors.forename: Bing-Wen
authors.initials: BW
authors.lastname: Hu
authors.affiliation: Department of Chemistry, Beijing Normal University , Beijing 100050, P. R. China.
authors.forename: Hongwei
authors.initials: H
authors.lastname: Tan
authors.affiliation: Department of Chemistry and Biochemistry, Texas State University , San Marcos, Texas 78666, United States.
authors.forename: Xiaopeng
authors.initials: X
authors.lastname: Li
authors.forename: Hai-Bo
authors.initials: HB
authors.lastname: Yang