期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 242, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.118757
关键词
Rhodamine-pyridine conjugate; Calorimetric recognition; Photoinduced energy transfer; Fluorescent turn-on; Reversible Fe(3+)sensor; Nanomolar detection
类别
资金
- Ministry of Science and Technology of Taiwan [MOST 108-2811-M-009-518, MOST 108-2112-M-009-011]
A novel rhodamine-pyridine conjugated spectroscopic probe RhP was synthesized and its X-ray single crystalline properties were revealed with tabulation. The RhP displayed a distinct pale-pink colorimetric and turn-on fluorescent response to Fe3+ in aqueous media (H2O:DMSO (95:5, v/v)] than that of other interfering ions. During the Fe3+ recognition, the absorption (UV-Vis) and photoluminescence (PL) spectral studies revealed new peaks at 561 and 592 nm, respectively. The 1:1 stoichiometry and binding sites were verified by Job's plot, ESI-mass, and H-1 NMR titrations. Subsequently, LOD and binding constant for RhP + Fe3+ complex were estimated as 1023 nM and 6265 x 10(4) M-1 from linear fitting and Benesi-Hildebrand plots, correspondingly. Sensor reversibility of RhP + Fe3+ by EDTA was demonstrated by UV/PL and TRPL investigations. Moreover, the photoinduced energy transfer mechanism and band gap changes were established from the DFT interrogations. Lastly, cellular imaging studies were carried out to authenticate the real applicability of RhP in Fe3+ detection. (C) 2020 Elsevier B.V. All rights reserved.
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