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Iron is crucial for various biological processes in humans, animals, and plants, making precise and efficient monitoring of iron ion concentrations essential. To address this need, a cellulose‐based smart fluorescent material (NCC@NH2@RB) with a conjugated structure is designed and synthesized for the rapid and sensitive detection of Fe3+ ions. This sensor features core‐shell nanoparticles functionalized with rhodamine B (RB), using (3‐aminopropyl)triethoxysilane (APTES) as a linker. The resulting fluorescent probe, composed of nanocrystalline cellulose and RB, exhibits strong fluorescence under ultraviolet light, making it an effective tool for Fe3+ ion detection in water. When Fe3+ ions are introduced into a solution containing NCC@NH2@RB, they bind with weak‐field ligands such as nitrogen and oxygen in the probe's structure, forming complexes. This interaction involves high‐spin coordination and leads to the self‐assembly of Fe3+ ions on the surface of NCC@NH2@RB. The process generates single electrons, increasing paramagnetism and quenching the fluorescence. The NCC@NH2@RB fluorescent probe has a limit of detection (LOD) of 0.01 µM and a limit of quantification (LOQ) of 0.03 µM with linearity at concentrations of 1.0 × 10−4–2.5 × 10−3 m. This fluorescence quenching effect is specific to Fe3+ ions, ensuring that the probe remains unaffected by other metal ions. [ABSTRACT FROM AUTHOR]

In this work, we looked at how to make fluorescence hybrid poly(amidoamine) dendrimer (PAMAM) dendrimers using calcozine red 6G and coumarin end groups. After synthesis of ethylenediamine (EDA)-cored 4th generation PAMAM dendrimer (G4.0), surface functional groups is reacted with calcozine red 6G (Rh6G) and 7-methacryloyloxy-4-methylcoumarin. Fourier transform infrared spectroscopy, proton nuclear magnetic resonance (1H NMR), and X-ray diffraction are used to characterize the structure of synthesized fluorescent hybrid dendrimers. Optical properties are demonstrated using a fluorescence spectrophotometer, and UV–Vis–NIR reflectance spectra. According to UV–Vis–NIR reflectance spectra, hybrid dendrimers were transparent in the NIR range. Moreover, quantum yield (Φs) of hybrid dendrimers was calculated in dimethylformamide (DMF), ethanol, dimethyl sulfoxide (DMSO), and distilled water (H2O). Dendrimers in which Rh6G was utilized to modification showed the maximum quantum yield in ethanol due to great interaction of structure with ethanol and the arrangement of ring-opened amide shape of calcozine red 6G. [ABSTRACT FROM AUTHOR]

Rhodamine 6G (Rh6G) is modified by ethylenediamine to obtain rhodamine with amine functional groups (Rh6G-NH2). Rh6G-NH2 as an initial core is used to bond coumarin derivatives. Synthesized fluorescent colorants are specified using Fourier transform infrared spectroscopy (FT-IR), proton and carbon nuclear magnetic resonance (1H NMR and 13C NMR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM) to analyze the structure of the fluorescent pigments. Fluorescence microscopy, fluorescence spectrophotometer, and UV–visible–NIR reflectance spectra are used to demonstrate the optical properties. UV–Vis–NIR reflectance spectra showed that synthesized colorants were transparent in NIR region. Also, photophysical properties of 2-(4-methyl-2-oxo-2H-chromen-7-yloxy) acetic acid (MOHCYAA), Rh6G-NH2, and hybrid 2-(4-methyl-2-oxo-2H-chromen-7-yloxy) acetic acid/rhodamine 6G (HMR) were investigated. Type of solvent had a strong effect on quantum yield. Rh6G-NH2 (ϕs = 0.66) and HMR (ϕs = 0.72) displayed the maximum quantum yield in ethanol due to good interaction with ethanol and the formation of ring-opened amide form of rhodamine group. Finally, Rh6G-NH2 and HMR displayed the maximum quantum yield in ethanol due to good interaction of structure with ethanol and the formation of ring-opened amide form of rhodamine group in compound. [ABSTRACT FROM AUTHOR]

Rhodamine 6G (Rh6G) is modified by ethylenediamine to obtain rhodamine with amine functional groups (Rh6G-NH2). Rh6G-NH2 as an initial core is used to bond coumarin derivatives. Synthesized fluorescent colorants are specified using Fourier transform infrared spectroscopy (FT-IR), proton and carbon nuclear magnetic resonance (1H NMR and 13C NMR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FE-SEM) to analyze the structure of the fluorescent pigments. Fluorescence microscopy, fluorescence spectrophotometer, and UV–visible–NIR reflectance spectra are used to demonstrate the optical properties. UV–Vis–NIR reflectance spectra showed that synthesized colorants were transparent in NIR region. Also, photophysical properties of 2-(4-methyl-2-oxo-2H-chromen-7-yloxy) acetic acid (MOHCYAA), Rh6G-NH2, and hybrid 2-(4-methyl-2-oxo-2H-chromen-7-yloxy) acetic acid/rhodamine 6G (HMR) were investigated. Type of solvent had a strong effect on quantum yield. Rh6G-NH2 (ϕs = 0.66) and HMR (ϕs = 0.72) displayed the maximum quantum yield in ethanol due to good interaction with ethanol and the formation of ring-opened amide form of rhodamine group. Finally, Rh6G-NH2 and HMR displayed the maximum quantum yield in ethanol due to good interaction of structure with ethanol and the formation of ring-opened amide form of rhodamine group in compound. [ABSTRACT FROM AUTHOR]

In this study, N -(rhodamine-6G) lactam- N′ -allyl-ethylenediamine (RH6GAB) and 7-(allyloxy)−2H-chromen-2-one (AC) as fluorescent monomers were synthesized and characterized by FT-IR, and proton nuclear magnetic resonance (1H NMR). Poly(acrylamide- co -AC) P(AAm- co -AC), P(AAm- co -RH6GAB), P(AAm- co -RH6GAB- co -AC), and P(AAm- co -AC)- b -(AAm- co -RH6GAB) copolymers were synthesized via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Copolymers were characterized using 1H NMR and FT-IR. For selective photo-sensing of metal ions, optical chemosensors based on rhodamine 6G and coumarin chromophores were synthesized. The rhodamine 6G exhibits exceptionally strong fluorescence emission and coloring properties that are useful in sensing applications. Metal ion (Fe3+, Ni2+, Cu2+, Cd2+, Co2+, and Pb2+) selectivity of P(AAm- co -AC), P(AAm- co -RH6GAB), P(AAm- co -RH6GAB- co -AC), and P(AAm- co -AC)- b -(AAm- co -RH6GAB) were investigated by fluorescence spectrophotometry. Obtained results indicated that coumarin- and rhodamine-based copolymers can be used for selective detection of Fe3+. [Display omitted] [ABSTRACT FROM AUTHOR]

In this study, N -(rhodamine-6G) lactam- N′ -allyl-ethylenediamine (RH6GAB) and 7-(allyloxy)−2H-chromen-2-one (AC) as fluorescent monomers were synthesized and characterized by FT-IR, and proton nuclear magnetic resonance (1H NMR). Poly(acrylamide- co -AC) P(AAm- co -AC), P(AAm- co -RH6GAB), P(AAm- co -RH6GAB- co -AC), and P(AAm- co -AC)- b -(AAm- co -RH6GAB) copolymers were synthesized via reversible addition-fragmentation chain-transfer (RAFT) polymerization. Copolymers were characterized using 1H NMR and FT-IR. For selective photo-sensing of metal ions, optical chemosensors based on rhodamine 6G and coumarin chromophores were synthesized. The rhodamine 6G exhibits exceptionally strong fluorescence emission and coloring properties that are useful in sensing applications. Metal ion (Fe3+, Ni2+, Cu2+, Cd2+, Co2+, and Pb2+) selectivity of P(AAm- co -AC), P(AAm- co -RH6GAB), P(AAm- co -RH6GAB- co -AC), and P(AAm- co -AC)- b -(AAm- co -RH6GAB) were investigated by fluorescence spectrophotometry. Obtained results indicated that coumarin- and rhodamine-based copolymers can be used for selective detection of Fe3+. [Display omitted] [ABSTRACT FROM AUTHOR]

[Display omitted] Photoresponsive polymers have garnered significant interest due to their potential applications in a wide range of fields, from self-healing materials to drug delivery systems. Coumarin, a versatile compound, has emerged as a key component in the design of photoresponsive polymers. Coumarins unique photochemical properties, such as its ability to undergo dimerization upon exposure to UV light, make it an attractive candidate for triggering controlled changes in polymer structure and behavior. The incorporation of coumarin moieties into polymer chains enables the modulation of self-assembly mechanisms, leading to tunable and reversible material properties. Researchers have investigated the impact of coumarin on the responsiveness of these polymers to external stimuli, particularly light. Through careful design and synthesis, coumarin-based photoresponsive polymers have demonstrated impressive capabilities, including dynamic changes in solubility, morphology, and mechanical properties upon UV irradiation. This review article sheds light on the recent advancements in understanding the role of coumarin in self-assembly processes within photoresponsive polymers, providing insights into the potential applications of these materials in fields like smart coatings, Self-healing coatings, soft robotic, ink, finger print, sensors, and drug delivery systems. [ABSTRACT FROM AUTHOR]