A rhodamine-based fluorescent sensor for selective detection of Cu2+ in aqueous media: Synthesis and spectroscopic properties

Abstract

Two new chemosensors, rhodamine B derivative bearing 3-formyl-6-nitrochromone (L 1) and 3formyl-6-methylchromone (L 2) units were designed and synthesized using microwave irradiation for the selective detection of Cu 2+ in aqueous media. Copper triggers the formation of highly fluorescent ring-open spirolactam. The fluorescence intensity was remarkably increased upon the addition of Cu 2+ within a minute, while the other metal ions caused no significant effect. More importantly, the resulting complexes can be used as a reversible fluorescence sensor for CN −. The recognition ability of the sensors was investigated by fluorescence titration, Job's plot, 1 H NMR spectroscopy and density functional theory (DFT) calculations.

Synthesis, Characterization, and Studies on Photophysical Properties of Rhodamine Derivatives and Metal Complexes in Dye-Sensitized Solar Cells

“…Subsequently, we investigated the binding stoichiometry between dye sensors P15 , P41 , and P45 and Cu 2+ using Job’s method ( 27 ),. Various molar ratios between each dye sensor and Cu 2+ metal ions were measured.…”

“…An essential goal for chemists is to develop a rapid, sensitive, and practical chemosensor for the detection of heavy and transition metal ions. 27 Copper ion (Cu 2+ ) is a major metal pollutant due to its extensive use in the biological and chemical industries. In this study, the effect of copper on the photophysical properties of three rhodamine dyes are investigated.…”

Novel Fluorescent Probe toward Fe3+ Based on Rhodamine 6G Derivatives and Its Bioimaging in Adult Mice, Caenorhabditis elegans, and Plant Tissues

“…And it could not cause any damage to cell. − To date, many fluorescent probes for Fe 3+ have been synthesized successfully, which included coumarin, , anthracene, BODIPY, , cyanine, and rhodamines . Among these probes, rhodamine 6G has many advantages over other derivatives, including high extinction coefficients, high quantum yields, excellent photostability, and emission wavelengths. − However, most rhodamine derivatives were obtained through CN, but a few compounds linked by amide have been reported. − It was clear that the amide-modified rhodamine 6G derivatives have more potential coordination sites to bind metal ions than CN . Moreover, the interaction between rhodamine 6G and metal ions was rarely confirmed by single-crystal structure, which restricted our understanding of its interaction mode between them. , …”

Synthesis, Photophysical Characterization, and Sensor Activity of New 1,8-Naphthalimide Derivatives

“…Various fluorescence chromophore systems such as 1,8-naphthalimide, benzanthrone, xanthene derivatives, etc. are used as a signal fragment in the design of PET sensor systems [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. Very important among these are the derivatives of 1,8-naphthalimide, which depending on the nature of the C-4 substituents, may emit blue or yellow-green fluorescence [ 14 , 15 , 16 , 17 ].…”