Emissive Platinum(II) Cages with Reverse Fluorescence Resonance Energy Transfer for Multiple Sensing

Zhang, Zeyuan; Zhao, Zhengqing; Wu, Lianwei; Lu, Shuai; Ling, Sanliang; Li, Guoping; Xu, Letian; Ma, Lingzhi; Hou, Yali; Wang, Xingchen; Li, Xiaopeng; He, Gang; Wang, Kai; Zou, Bo; Zhang, Mingming

Abstract

It is quite challenging to realize fluorescence resonance energy transfer (FRET) between two chromophores with specific positions and directions. Herein, through the self-assembly of two carefully selected fluorescent ligands via metal-coordination interactions, we prepared two tetragonal prismatic platinum(II) cages with a reverse FRET process between their faces and pillars. Bearing different responses to external stimuli, these two emissive ligands are able to tune the FRET process, thus making the cages sensitive to solvents, pressure, and temperature. First, these cages could distinguish structurally similar alcohols such as n-butanol, t-butanol, and i-butanol. Furthermore, they showed decreased emission with bathochromic shifts under high pressure. Finally, they exhibited a remarkable ratiometric response to temperature over a wide range (223–353 K) with high sensitivity. For example, by plotting the ratio of the maximum emission (I600/I480) of metallacage 4b against the temperature, the slope reaches 0.072, which is among the highest values for ratiometric fluorescent thermometers reported so far. This work not only offers a strategy to manipulate the FRET efficiency in emissive supramolecular coordination complexes but also paves the way for the future design and preparation of smart emissive materials with external stimuli responsiveness.

• Journal Article Type: Article
• Acceptance Date: Jan 15, 2020
• Online Publication Date: Jan 27, 2020
• Publication Date: Feb 5, 2020
• Deposit Date: Jan 31, 2020
• Publicly Available Date: Jan 28, 2021
• Journal: Journal of the American Chemical Society
• Print ISSN: 0002-7863
• Electronic ISSN: 1520-5126
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 142
• Issue: 5
• Pages: 2592-2600
• DOI: https://doi.org/10.1021/jacs.9b12689
• Keywords: Colloid and surface chemistry; Biochemistry; General chemistry; Catalysis
• Public URL: https://nottingham-repository.worktribe.com/output/3842554
• Publisher URL: https://pubs.acs.org/doi/abs/10.1021/jacs.9b12689
• Additional Information: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://pubs.acs.org/doi/abs/10.1021/jacs.9b12689see http://pubs.acs.org/page/policy/articlesonrequest/index.html