Stimuli-Responsive Luminescent Properties of Tetraphenylethene-Based Strontium and Cobalt Metal-Organic Frameworks.

Authors :: Guo X
Zhu N
Wang SP
Li G
Bai FQ
Li Y
Han Y
Zou B
Chen XB
Shi Z
Feng S
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2020 Oct 26; Vol. 59 (44), pp. 19716-19721. Date of Electronic Publication: 2020 Oct 08.
Publication Year :: 2020
Abstract: Herein we report two new TPE-based 3D MOFs, that is, Sr-ETTB and Co-ETTB (TPE=Tetraphenylethylene, H <subscript>8</subscript> ETTB=4',4''',4''''',4'''''''-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1'-biphenyl]-3,5-dicarboxylic acid))). Through tailoring outer shell electron configurations of Sr <superscript>II</superscript> and Co <superscript>II</superscript> cations, the fluorescence intensity of the MOFs is tuned from high emission to complete non-emission. Sr-ETTB with strong blue fluorescence shows reversible fluorescence variations in response to pressure and temperature, which is directly related to the reversible deformation of the crystal structure. In addition, non-emissive Co-ETTB counterpart exhibits a turn-on fluorescent enhancement under the stimulation of analyte histidine. In the process, TPE-cored linkers in the MOFs are released through competitive coordination substitution and subsequently reassembled to perform aggregation-induced luminescence behavior originated from the organic linkers.<br /> (© 2020 Wiley-VCH GmbH.)

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