Water-soluble aluminium fluorescent sensor based on aggregation-induced emission enhancement

Abstract

Development of a portable miniature system for Al(iii) detection in pure aqueous solutions using a novel AIEE compound.

Autonomous and In Situ Ocean Environmental Monitoring on Optofluidic Platform

“…However, both of them require tedious sample preparation and pretreatment, expensive equipment, and professional personnel, making them insuitable in applications for autonomous, in situ, and continuous monitoring of heavy metals. In this case, ocean monitoring sensors based on colorimetric, fluorescent, and chemiluminescent methods appear as promising technologies due to the high sensitivity and feasibility, versatility, and reproducibility [84][85][86][87][88][89][90][91][92][93][94][95], and all of these methods have been truly applied for online analysis of heavy metals in seawater.…”

“…The basic mechanism of the fluorescent method is that the fluorescence parameters (such as fluorescence intensity, lifetime, and spectrum) change in response to the concentration variations of some ions. Until now, numerous fluorescent sensors based on chelation-enhanced fluorescence [98,99] photo-induced electron transfer [92], aggregation-induced emission effect [100], and intramolecular charge transfer [101] have already been reported for heavy metal monitoring. Leray's group developed several optofluidic devices that incorporated fluorimetric detection for the monitoring of heavy metals such as aluminum and cadmium [92,93,102].…”

“…Leray's group developed several optofluidic devices that incorporated fluorimetric detection for the monitoring of heavy metals such as aluminum and cadmium [92,93,102]. Recently, the aluminum-sensing mechanism by PSSA-4-propoxysulfonate salicylaldehyde azine was proposed [92]. As shown in Figure 7e-g, the sensing system includes a microfluidic chip made from PDMS/glass, and a fluorescence detection platform consists of a LED (365) nm and a photomultiplier (PMT) detector.…”

Acridino-Diaza-20-Crown-6 Ethers: New Macrocyclic Hosts for Optochemical Metal Ion Sensing

“…The recently published Al 3+ -selective optochemical sensors [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ] were similarly compared. Due to the similar atomic radius and valence to Mg 2+ , Ca 2+ and Fe 3+ , Al 3+ can act as a competitive inhibitor of these ions in biological processes [ 34 ] and can also induce neurodegenerative disorders [ 41 ].…”

“…It appears that the majority of Al 3+ -sensors show similar characteristics in operation—i.e., in the applied semi-aqueous medium, similar association constants (log K = 3.5–7.5) and low limits of detection (6.0 × 10 −6 M–2.7 × 10 −8 M), below the tolerance limit in drinking water (~7.4 × 10 −6 M [ 42 , 43 ]) —as those reported for Zn 2+ -selective ones [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Unfortunately, the selectivity of the reported sensor molecules is often limited due to the interference of other cations, which were typically Ni 2+ [ 28 , 31 ], Cu 2+ [ 30 , 31 , 32 , 40 ], Hg 2+ [ 30 , 32 ], Fe 2+ [ 31 ], Mg 2+ [ 36 ], and especially trivalent ions like Cr 3+ [ 30 , 36 , 40 ]. In the case of Al 3+ -sensors, the study of pH-dependence is of high importance as Al 3+ acts as a Lewis acid in water, thus adding it into a sample solution definitely results in a change of pH, which affects the photophysical behavior of the chemosensors.…”