Rhodamine-Based
Fluorescent Probe for Al<sup>3+</sup> through Time-Dependent PET–CHEF–FRET
Processes and Its Cell Staining Application
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Abstract
Rhodamine-diformyl <i>p</i>-cresol conjugate (L) has been developed as a novel Al<sup>3+</sup>-selective fluorometric and colorimetric sensor based on
the FRET mechanism for the first time. L can selectively detect Al<sup>3+</sup> through time-dependent PET–CHEF and FRET processes.
This phenomenon is nicely reflected from <sup>1</sup>H NMR, fluorescence
lifetime, and fluorescence cell imaging studies. The probe can detect
Al<sup>3+</sup> as low as 5 × 10<sup>–9</sup> M in HEPES-buffered
EtOH:water (0.1 M, 4:1, v/v, pH 7.4). The probe shows pH-dependent
emission properties viz. an intense red emission (585 nm) at acidic
pH and an intense green fluorescence (535 nm) at basic pH. Thus, L
can also be used as a pH sensor via tunable wavelength