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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]

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]