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Design and Investigation of Optical Properties of N-(Rhodamine-B)-Lactam-Ethylenediamine (RhB-EDA) Fluorescent Probe

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Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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Institute for Environmental Protection and Sensors, Beloruska 7, 2000 Maribor, Slovenia
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Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1201; https://doi.org/10.3390/s18041201
Received: 9 March 2018 / Revised: 6 April 2018 / Accepted: 11 April 2018 / Published: 14 April 2018
(This article belongs to the Section Chemical Sensors)
This study presents chemical modification of a Rhodamine B (RhB) sensor probe by ethylenediamine (EDA), and investigation of its spectral as well as sensor properties to the various metals. The synthesised N-(Rhodamine-B)-lactam-ethylenediamine (RhB-EDA) fluorescent probe shows interesting optical sensor properties, and high sensitivity and selectivity to Ag+ ions among all the tested metal ions (K+, Mg2+, Cu2+, Ni2+, Fe2+, Pb2+, Na+, Mn2+, Li+, Al3+, Co2+, Hg2+, Sr2+, Ca2+, Ag+, Cd2+ and Zn2+), while the well-known Rhodamine B (RhB) fluorescent probe shows much less sensitivity to Ag+ ions, but high sensitivity to Fe2+ ions. The novel fluorescent sensor probe RhB-EDA has the capabilities to sense Ag+ ions up to µM ranges by using the fluorescence quenching approach. The probe displayed a dynamic response to Ag+ in the range of 0.43 × 10−3–10−6 M with a detection limit of 0.1 μM. The sensing system of an RhB-EDA novel fluorescent probe was optimised according to the spectral properties, effect of pH and buffer, photostability, incubation time, sensitivity, and selectivity. Since all the spectral and sensing properties were tested in green aqueous media, although many other similar sensor systems rely on organic solvent solutions, the RhB-EDA sensing probe may be a good candidate for measuring Ag+ ions in real-life applications. View Full-Text
Keywords: rhodamine B; ethylenediamine; chemical modification; fluorescence quenching; optical detection; Ag+ ions rhodamine B; ethylenediamine; chemical modification; fluorescence quenching; optical detection; Ag+ ions
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Soršak, E.; Volmajer Valh, J.; Korent Urek, Š.; Lobnik, A. Design and Investigation of Optical Properties of N-(Rhodamine-B)-Lactam-Ethylenediamine (RhB-EDA) Fluorescent Probe. Sensors 2018, 18, 1201.

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