Novel single-armed nitrogen-heterocyclic salamo-based fluorescent sensors for the detection of Al3+ and CN-

摘要

Two novel single-armed nitrogen-heterocyclic chemosensors with basically similar structures, PDNS and PZNS, were synthesized to specifically identify Al3+ in DMS:H2O (1:1 v/v) solution by fluorescence emission spectroscopy, and the colour of PDNS and PZNS changed from yellow to colorless when Al3+ was added under daylight. This is the first time that nitrogen-heterocyclic is introduced into salamo-based chemical sensor. At excitation wavelengths of 361 and 365 nm, solutions of PDNS and PZNS changed to intense green-blue fluorescence. Furthermore, it was found that PDNS/PZNS and Al3+ have excellent binding capacity, the lower limit of detection (LOD = 6.25 x 10(-9)/1.26 x 10(-9) mol.dm(-3)) is also calculated. In addition, sensor PZNS can detect Al3+ in a solution system with up to 95% water content and applicable pH range is 3-12. Compared to other salamo-based sensors, PZNS and PDNS have broader detection conditions and wider utilities. PZNS can also identify CN- in fluorescence spectrum. PZNS can be used for detection of Al3+ in aqueous systems in daily production and life. (C) 2021 Elsevier B.V. All rights reserved.