A new tetramine bis(2-naphthol)-derivative fluorescent chemosensor for aluminum ion (Al3+)

Study of a Fluorescent System Based on the Naphthalene Derivative Fluorescent Probe Bound to Al3

The naphthalene derivative fluorescent probe F6 was synthesized and a 1 × 10^-3 mol/L solution of Al³⁺ and other metals to be tested was prepared for the subsequent experiments. The Al³⁺ fluorescence system of the naphthalene derivative fluorescent probe F6 was successfully constructed as demonstrated by fluorescence emission spectroscopy. The optimal time, temperature and pH of the reaction were investigated. The selectivity and anti-interference ability of the probe F6 for Al³⁺ were investigated by fluorescence spectroscopy in a methanol solution. The experiments showed that the probe has high selectivity and anti-interference ability for Al³⁺. The binding ratio of F6 to Al³⁺ was 2:1, and the binding constant was calculated to be 1.598 × 10⁵ M^-1. The possible mechanism of the binding of the two was speculated. Different concentrations of Al³⁺ were added to Panax Quinquefolium and Paeoniae Radix Alba. The results showed that the recoveries of Al³⁺ were 99.75-100.56% and 98.67-99.67%, respectively. The detection limit was 8.73 × 10^-8 mol/L. The experiments demonstrated that the formed fluorescence system can be successfully adapted for the determination of Al³⁺ content in two Chinese herbal medicines, which has good practical application.

Explicating the recognition phenomenon of hazardous nitro-aromatic compound from contaminated environmental and cellular matrices by rationally designed pyridine-functionalized molecular probes

In the quest of recognizing hazardous nitro-aromatic compounds in water, two pyridine-functionalized Schiff-base chemosensors, DMP ((E)-N-(3,4-dimethoxybenzylidene)(pyridin-2-yl)methanamine)) and MP (4-((E)-((pyridin-2-yl)methylimino)methyl)-2-ethoxyphenol) have been synthesized to detect mutagenic 2,4,6-Trinitrophenol (TNP) in soil, water as well as cellular matrices by producing turn-off emission responses as a combined consequence of PET and RET processes. Several experimental analyses including ESI-MS, FT-IR, photoluminescence, ¹H NMR titration, and the theoretical calculations ascertained the formation and sensing efficacies of the chemosensors. The analytical substantiations revealed that structural variation of the chemosensors played a significant role in improving the sensing efficiency, which would certainly be worthwhile in developing small molecular TNP sensors. The present work depicted that the electron density within the MP framework was more than that of DMP due to the intentional incorporation of -OEt and -OH groups. As a result, MP represented a strong interaction mode towards the electron-deficient TNP with a detection limit of 39 μM.