An excellent colorimetric and "turn off" fluorescent probe for tetrahydrofuran based on a luminescent macrocyclic samarium(iii) complex.

Author(s) Yang, Z.R.; Feng, C.C.; Nie, P.P.; Chen, T.T.; Zhang, L.F.; Ma, S.; Shen, Y.J.; Lu, Z.Y.; Lin, M.L.; Zhang, K.
Journal Analyst
Date Published 2019 Aug 16
Abstract

In this paper we report a novel probe based on a luminescent 23-membered [1 + 1] Schiff-base macrocyclic mononuclear Sm(iii) complex Sm-2e, originating from the dialdehyde H2Qe and 1,2-bis(2-aminoethoxy)ethane precursors, which is synthesized by the Sm(iii) ion template method. X-ray structural analyses confirm that each ten-coordinate Sm(iii) center with the coordination geometry of a distorted bicapped square antiprism is fully encapsulated by a flexible macrocyclic ligand H2L2e to form a "lasso-type" architecture, and this architecture could enable efficient energy transfer in various solvents confirmed by long lifetimes (33.5-65.2 μs) and high quantum yields (0.23-0.76%) of the Sm(iii) ion. Simultaneously, complex Sm-2e could serve as a probe for sensing organic solvents. Particularly, this complex probe Sm-2e exhibits a highly selective, rapid and sensitive response to tetrahydrofuran (THF), which is easily distinguished by a large absorption shift, even visible to the naked eye, and complete fluorescence quenching. Moreover, the limit of detection for THF is about 0.20% determined by titration experiments, and good selectivity for THF could still be realized in mixture solvents. Consequently, this colorimetric and "turn off" fluorescent probe Sm-2e could be a valuable candidate as a sensor material for sensing THF which has been rarely reported.

DOI 10.1039/c9an01037h
Keywords Colorimetry; Coordination Complexes; Fluorescence; Fluorescent Dyes; Furans; Limit of Detection; Samarium; Schiff Bases; Spectrometry, Fluorescence
ISSN 1364-5528
Citation Yang Z-, Feng C-, Nie P-, Chen T-, Zhang L-, Ma S, et al. An excellent colorimetric and "turn off" fluorescent probe for tetrahydrofuran based on a luminescent macrocyclic samarium(iii) complex. Analyst. 2019;144(17):5254-5260.

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