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Novel Rhodamine B and 2 H ‐benzo[ b ][1,4]oxazin‐3(4 H )‐one‐derived Fluorescent Sensor for Low pH Value Detection
Author(s) -
Chen Mingjun,
Bai Xueke,
Qi Zhenping,
Xiang Shoubo,
Zuo Hua,
Choi KyungMin,
Shin DongSoo
Publication year - 2019
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11819
Subject(s) - fluorescence , chemistry , rhodamine , rhodamine b , buffer solution , analytical chemistry (journal) , naked eye , ph indicator , absorption (acoustics) , ultraviolet , moiety , photochemistry , detection limit , chromatography , stereochemistry , materials science , catalysis , photocatalysis , optics , physics , optoelectronics , composite material , biochemistry
A new fluorescent probe L fusing the rhodamine B scaffold with 2H‐benzo[b][1,4]oxazin‐3(4H)‐one moiety has been developed and applied as an acidic pH sensor. The ultraviolet (UV) and fluorescence spectra of the probe at different pH values were investigated in B–R buffer/MeOH (v: v = 3: 7). This probe showed increase of both the UV–Vis absorption and fluorescence emission from alkaline/neutral to acidic condition, reaching a strongest intensity at pH 2.13, but the intensities decreased when the pH decreased to 1.83. The color variation along the pH changes proved that the probe L can be used as a low‐cost optical sensor for the naked eye detection of proton in the present buffer.