The Amidine Based Colorimetric Sensor for Fe3+, Fe2+, and Cu2+ in Aqueous Medium

Abstract

An amidine based chemosensor AM-1 was synthesized and characterized by various spectroscopic (FT-IR, (1)H-NMR and mass) data and elemental analyses. Sensor AM-1 exhibited high selectivity and sensitivity towards Fe(3+), Fe(2+) and Cu(2+) in the presence of other surveyed ions (such as Sr(2+), Cr(3+), Co(2+), Ni(2+), Zn(2+), Ag(+), Al(3+), Ba(2+), Ca(2+), Cd(2+), Cs(+), Hg(2+), K(+), Li(+), Mg(2+), Mn(2+), Na(+) and Pb(2+)) with a distinct naked-eye detectable color change and a shift in the absorption band. Moreover, the emission of AM-1 was quenched selectively only in the presence of Fe(3+).

Optical, electrochemical, and sensing properties of polyfluorenes bearing thiazole or oxazole and triphenylamine in the main chain

“…Ferrocene was used as internal reference. HOMO and LUMO levels were estimated from the onset ( E ons ) of oxidation or reduction peak, respectively, on the basis of the reference energy level of ferrocene (4.8 eV below the vacuum level) with the equations …”

“…Ferrous ions are associated with the generation of high reactive hydroxyl radicals . Low molecular fluorescent probes have been developed for ferrous ions detection . To the best of our knowledge there are a few publications on Fe 2+ fluorescent probe based on p‐conjugated polymer …”

2,4-Diamino-6-Hydroxypyrimidine Based Poly(azomethine-Urethane): Synthesis and Application as a Fluorescent Probe for Detection of Cu2+ in Aqueous Solution

“…2,4-diamino-6-hydroxypyrimidine (AHP), 4-(diethylamino)salicylaldehyde (SAL), toluene diisocyanate (TDI), acetone, acetonitrile (MeCN), carbon tetrachloride (CCl 4 ), chloroform (CHCl 3 ), dimethylformamide (DMF), ethanol (EtOH), ethyl acetate, methanol (MeOH), n-hexane, tetrahydrofurane (THF), toluene, Mn(CH 3 COO) 2 4 were also supplied from Riedel Dehaen.…”

“…have gained enormous attention due to metabolic and biological importance of these transition metal ions [1][2][3]. Among the various kinds of chemical sensors, fluorescent sensors or probes for detection of metal ions have received increasing interest due to their high sensivity, inherent simplicity, fast analysis with spatial resolution, and its sample/cell non-destructive nature [4][5][6].…”

Determination of Fe2+ and Co2+ by a Multiple‐Target Colorimetric Chemosensor with Low Detection Limit in Aqueous Solution

“…Hence, diverse colorimetric chemosensors have been developed to recognize iron and cobalt such as amidine, dansyl‐styrylquinoline, fluoran and terpyridine‐based iron sensors and rhodamine, dithizone, Schiff base, coumarin and quinolone‐based cobalt sensors . However, there is still a need to develop new sensors with low detection limit that can detect iron and cobalt in aqueous solution.…”