1. Two pyrene-based S-containing atropisomers: Different structures and different Ag+-response behaviors of their monomer-excimer emission.
- Author
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Jin, Ying-ying, Fang, Qi, Zhang, Shi-qian, and Liu, Zhi-qiang
- Subjects
- *
PYRENE , *ATROPISOMERS , *SOLVENTS , *MONOMERS , *CRYSTAL structure , *SILVER compounds - Abstract
Abstract Different structures and different Ag+-response behaviors of a pair of pyrene-based S-containing atropisomers, namely s -BSPPy and a -BSPPy , have been investigated. The calculated high rotation barrier indicates that the two atropisomers are non-interconvertible. In polar solvents, s -BSPPy exhibits excimer emission but a -BSPPy does not. Based on the X-ray structures and the DFT calculated intermolecular interactions, the excimer of s -BSPPy is suggested to take a non-parallel edge-to-face λ -shaped geometry. Especially, s -BSPPy exhibits ratiometric excimer-off and monomer-on emission as a unique response to Ag+ in solutions, while no ratiometric Ag+-response was observed for a -BSPPy. Graphical abstract Unlabelled Image Highlights • In solution, s -BSPPy exhibits excimer emission, a -BSPPy does not. • Edge-to-face λ -shaped excimer of s -BSPPy. • s -BSPPy shows excimer-to-monomer emission in response to Ag+, a -BSPPy does not. • s -BSPPy and a -BSPPy atropisomers are non-interconvertible. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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