Design and Investigation of Optical Properties of N-(Rhodamine-B)-Lactam-Ethylenediamine (RhB-EDA) Fluorescent Probe

Abstract

This study presents chemical modification of a Rhodamine B (RhB) sensor probe by ethylenediamine (EDA), and investigation of its spectral as well as sensor properties to the various metals. The synthesised N-(Rhodamine-B)-lactam-ethylenediamine (RhB-EDA) fluorescent probe shows interesting optical sensor properties, and high sensitivity and selectivity to Ag+ ions among all the tested metal ions (K+, Mg2+, Cu2+, Ni2+, Fe2+, Pb2+, Na+, Mn2+, Li+, Al3+, Co2+, Hg2+, Sr2+, Ca2+, Ag+, Cd2+ and Zn2+), while the well-known Rhodamine B (RhB) fluorescent probe shows much less sensitivity to Ag+ ions, but high sensitivity to Fe2+ ions. The novel fluorescent sensor probe RhB-EDA has the capabilities to sense Ag+ ions up to µM ranges by using the fluorescence quenching approach. The probe displayed a dynamic response to Ag+ in the range of 0.43 × 10−3–10−6 M with a detection limit of 0.1 μM. The sensing system of an RhB-EDA novel fluorescent probe was optimised according to the spectral properties, effect of pH and buffer, photostability, incubation time, sensitivity, and selectivity. Since all the spectral and sensing properties were tested in green aqueous media, although many other similar sensor systems rely on organic solvent solutions, the RhB-EDA sensing probe may be a good candidate for measuring Ag+ ions in real-life applications.

Highly Water-Stable Dye@Ln-MOFs for Sensitive and Selective Detection toward Antibiotics in Water

“…RhB is an outstanding cationic fluorophore for chem/biosensing applications. − However, its widespread application is limited by the aggregation-induced quenching and photoinduced degradation. Herein, an encapsulating strategy is utilized by capturing and restraining the RhB molecule into the porous framework of Tb-dcpcpt (Figure a).…”

Rational design of a meso phosphate-substituted pyronin as a type I photosensitizer for photodynamic therapy

“…2d, both PY-P and P2 displayed considerable stability in PBS buffer solution (pH = 7.4), but they underwent a quick reversible addition reaction under alkaline conditions due to the high electrophilicity at the meso position, making them more susceptible to nucleophilic reagents. 24–26 Moreover, PY-P showed more resistance in alkaline media than P2 (Fig. S2, ESI†).…”

A Novel High Selective Colorimetric Chemosensor for Determination of Copper in Food Samples: Visual Detection

“…These studies were done by using the fluorescent and absorbance characteristic of this dye. [17][18][19] Therefore, synthesis and applying rhodamine based sensor is very important to introduce a high capable color sensor for detection of analytes.…”

“…There are many colorimetric sensors based on rhodamine B due to its high color properties in the literature. These studies were done by using the fluorescent and absorbance characteristic of this dye [17–19] . Therefore, synthesis and applying rhodamine based sensor is very important to introduce a high capable color sensor for detection of analytes.…”