Abstract
These structurally isomeric rhodamine 6G-based amino derivatives are designed to detect Sn2+ ions. The receptors exhibit rapid fluorescent “turn-on” responses towards Sn2+. The absorption (530 nm) and fluorescent intensity (551 nm) of the receptors increase when increasing the concentration of Sn2+. The hydrazine derivative exhibits more rapid sensitivity towards Sn2+ than the ethylene diamine derivative, indicating that the presence of an alkyl chain in the diamine decreases the sensitivity of the receptors towards Sn2+. The presence of carbonyl groups and terminal amino groups strongly influences the sensitivity of the chemosensors toward Sn2+ by a spirolactam ring-opening mechanism. The receptors exhibit 1:1 complexation with Sn2+ as evidenced by Job plot, and the corresponding limit of detection was found to be 1.62 × 10−7 M. The fluorescence images of the receptors and their complexes reveal their potential applications for imaging of Sn2+ in real/online samples.
Highlights
Many efforts have been devoted to developing fluorescent sensors for Sn2+ /Sn4+, which are based on naphthalimide–rhodamine B [2], coumarin derivative [12], oxo chromenefunctionalized rhodamine B [13], alkene-functionalized rhodamine B [14], diarylethenecarbazole derivative [15], 4-(naphthalen-1-ylethynyl) aniline appended rhodamine B [16], benzyl 3-aminopropanoate–rhodamine B conjugate [17], rhodamine B and N,N-bis-(2hydroxyethyl)ethylenediamine or tert-butyl carbazate derivatives [18], naphthoquinonedopamine [19], benzophenone derivative [20], 4-((3-chloro-1,4-dioxo-1,4-dihydronaphthalen
The rhodamine 6G–ethylene diamine derivative (Rh-ED) was synthesized according to the same procedure, except that ethylene diamine was used in place of hydrazine hydrate
The receptors were prepared from the amination of rhodamine 6G with hydrazine hydrate or ethylene diamine in ethanol solution
Summary
Tin is a grey-white metal and exists in Sn2+ and Sn4+ oxidation states. The concentration of tin in soil and Earth’s crust is approximately
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