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Conformational change due to intramolecular hydrophobic interaction leads to large blue-shifted emission from single molecular cage solutions

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Abstract

We demonstrate a unique negative solvatochromic emission (NSE) process from a conformational change of a coordination cage in response to solvent composition. The cationic cage contains two tetra-(4-pyridylphenyl)ethylene (TPPE) luminogens on two opposite faces, linked by Pt(PEt3)2 and isophthalate. When the solvent changes from acetone/acetonitrile/methanol to water, the emission of single cages gradually shifts to short wavelength (NSE) with a drastic value of ∼60 nm. Small angle X-ray scattering (SAXS) measurements indicate a molecular conformational change during the process and intramolecular π–π stacking and hydrophobic interaction between the TPPE planes could be the driving forces. As a comparison, a cage with a longer inter-fluorophore distance does not have such strong intramolecular interactions and only shows regular positive solvatochromic emission (PSE) under the same conditions.

Graphical abstract: Conformational change due to intramolecular hydrophobic interaction leads to large blue-shifted emission from single molecular cage solutions

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Publication details

The article was received on 14 Nov 2018, accepted on 30 Nov 2018 and first published on 30 Nov 2018


Article type: Communication
DOI: 10.1039/C8CC09038F
Citation: Chem. Commun., 2019, Advance Article
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    Conformational change due to intramolecular hydrophobic interaction leads to large blue-shifted emission from single molecular cage solutions

    H. Li, T. Xie, Z. Liang, D. Dahal, Y. Shen, X. Sun, Y. Yang, Y. Pang and T. Liu, Chem. Commun., 2019, Advance Article , DOI: 10.1039/C8CC09038F

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