Synthesis and spectroscopic characterization of a fluorescent phenanthrene-rhodamine dyad for ratiometric measurements of acid pH values

Abstract

We present the rational design, synthesis and spectroscopic characterization of a novel dual excitation, three color emitting, pH-responsive fluorescent probe consisting of two phenanthrene and one rhodamine B units linked...

Multicolor Polystyrene Nanosensors for the Monitoring of Acidic, Neutral, and Basic pH Values and Cellular Uptake Studies

“…The synthesis of the dyad is detailed in the Supporting Information (Scheme S1). This dyad concept, utilized by us earlier for dual emissive molecular probes, circumvents the need for two different fluorophores for constructing ratiometric sensor particles. The latter can lead to inhomogeneous particle staining and particle-to-particle variations within a particle batch.…”

A rhodamine coumarin-derived fluorescence probe that selectively detects Fe3+ and measures radiation doses

“…As shown in Fig. 4 and S3,† at lower pH values (2.5–4.6), protons triggered rhodamine B to form an open-ring state, 35 leading to an increase in the fluorescence intensity ratio of I 585 . In addition, due to the FRET effect, I 405 decreased, and thus, I 585 / I 405 was enhanced.…”

Rhodamine B-Containing Chitosan-Based Films: Preparation, Luminescent, Antibacterial, and Antioxidant Properties

“…The observed hypsochromic shift in the emission maximum of film C’ (633 nm) compared to its analogs A’ and B’ (both 639 nm) is most likely associated with the somewhat lower fluorescence self-quenching in this sample, due to a decrease in absorption with an increase in the pH of the Rhodamine B environment. Nevertheless, this does not lead to an increase in the quantum yield of the film C’, since an increase in pH also leads to a decrease in the luminescence intensity of Rhodamine B [ 29 , 30 , 31 , 32 ].…”