title: A novel Ag⁺ cation sensor based on polyamidoamine dendrimer modified with 1,8-naphthalimide derivatives.
abstract: In this study, 4-amino-1,8-naphthalimide-conjugated polyamidoamine dendrimer was synthesized and characterized and its potentiality as a cation sensor was investigated. 4-Amino-1,8-naphthalic anhydride reacted with polyamidoamine dendrimer and the product was characterized using FTIR, (1)H NMR, (13)C NMR and melting point analysis method. The synthesized compound was applied to detect various cations in water media and N,N-dimethylformamide (DMF) via monitoring the quenching of the fluorescence intensity. Furthermore, various metal cations including Cu(2+), Ni(2+), Zn(2+), Pb(2+),Ca(2+), Ba(2+), Cd(2+), Hg(2+), Fe(2+), Fe(3+) and Ag(+) were tested. The complexes formed between the synthesized compound and metal cations in solution and their effects on Photoinduced Electron Transfer (PET) process were investigated regarding the potential application of the newly-synthesized dendrimer as a colorimetric and fluorescent sensor for such cations. The results clearly confirmed that the 1,8-naphthalimide groups surrounding the central dendrimer core showed strong green fluorescence emission at 553 nm. This effect considerably decreased with the introduction of all cations, except Ag(+) where the fluorescence quenching effect was remarkable and more dominant. Therefore, it can be concluded that the synthesized dye has the potentiality of being a highly sensitive and selective fluorescence sensor for Ag(+) cation.
authors.affiliation: Textile Engineering Department, Amirkabir University, P.O. Box: 15874-4413, Tehran, Iran; Department of Organic Colorants, Institute for Color Science and Technology, P.O. Box:16765-654, Tehran, Iran.
authors.forename: Mohammad
authors.initials: M
authors.lastname: Dodangeh
authors.affiliation: Department of Organic Colorants, Institute for Color Science and Technology, P.O. Box:16765-654, Tehran, Iran; Center of Excellence for Color Science and Technology, Institute for Color Science and Technology, P.O. Box:16765-654, Tehran, Iran. Electronic address: gharanjig@icrc.ac.ir.
authors.forename: Kamaladin
authors.initials: K
authors.lastname: Gharanjig
authors.affiliation: Textile Engineering Department, Amirkabir University, P.O. Box: 15874-4413, Tehran, Iran.
authors.forename: Mokhtar
authors.initials: M
authors.lastname: Arami
mesh_terms: D015057:1-Naphthylamine / Q000031:analogs & derivatives* / Q000737:chemistry; D002414:Cations, Monovalent / Q000032:analysis; D050091:Dendrimers / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D053644:Naphthalimides / Q000737:chemistry*; D011073:Polyamines / Q000737:chemistry*; D015363:Quinolones / Q000737:chemistry*; D012834:Silver / Q000032:analysis*; D013050:Spectrometry, Fluorescence / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D002414:Cations, Monovalent; D050091:Dendrimers; D005456:Fluorescent Dyes; D053644:Naphthalimides; C531249:Poly(amidoamine); D011073:Polyamines; D015363:Quinolones; C086538:4-amino-1,8-naphthalimide; D012834:Silver; D015057:1-Naphthylamine
keywords: Cation sensor; Fluorescence intensity; Naphthalimide compounds; Photoinduced electron transfer; Polyamidoamine dendrimer