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Dynamic and static excimer: a versatile platform for single component white light emission and chelation-enhanced fluorescence

Abstract

The present study demonstrates the tuning of iconic optical features of pyrene through its judicious assembly with C3-symmetric triaminoguanidinium ion leading to the development of a unique multifunctional luminescent material, PYTG. The fine tuning of the concentration and the presence of external stimuli like temperature, the addition of analytes led to the dramatic change in fluorescence of PYTG providing an excellent platform for the exploration of dynamic and static excimer formation. Recently, white light emitting molecular probes received considerable attention in the scientific community due to their great potential in display devices. The tripodal PYTG was employed as a pure white light emitter consisting of blue emission from monomers and orange emission from excimers both in solution and thin film with Commission Internationale de l’Eclairage (CIE) coordinates of (0.33, 0.34) and (0.33, 0.38), respectively. The extent of dynamic excimer formation in the presence of monomers at higher concentrations of PYTG led to the tunable emission. Additionally, the rich electronic properties of PYTG allowed efficient detection of trivalent metal ions through turn-on fluorescence and colorimetric sensing of fluoride ion. PYTG selectively detects Fe3+ and Al3+ with nanomolar sensitivity in semi-aqueous solution through a chelation-enhanced fluorescence response in the orange-red region (em = 588 nm) by the static excimer formation. The ‘on-off’ fluorescence switching by the consecutive addition of trivalent cations and chelating ligand EDTA makes PYTG a promising fluorescent molecular switch. The simple and cost-effective strategy leading to the development of a versatile fluorescent probe and in-depth exploration of structure-property relationship as delineated in the present manuscript will pave the way for the emergence of novel task-specific molecular optical materials.

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Publication details

The article was received on 20 Jun 2018, accepted on 01 Oct 2018 and first published on 08 Oct 2018


Article type: Paper
DOI: 10.1039/C8TC03035A
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Dynamic and static excimer: a versatile platform for single component white light emission and chelation-enhanced fluorescence

    V. Kumar, S. Bahadur, S. Kundu and A. Patra, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C8TC03035A

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