# Fluorescent sensing of $^{99}$Tc pertechnetate in water

Amendola, Valeria; Bergamaschi, Greta; Boiocchi, Massimo; Alberto, Roger; Braband, Henrik (2014). Fluorescent sensing of $^{99}$Tc pertechnetate in water. Chemical Science, 5(5):1820-1826.

## Abstract

The selective binding of $^{99}$Tc pertechnetate ($^{99}$TcO$_4$−) in water is a big challenge. Recently, our group reported on the p-xylyl aza-cryptand, as the first molecular receptor for $^{99}$TcO$_4$− in aqueous solution. Here, we show that the introduction of a fluorescent unit in the azacryptand's framework leads to a new molecular system, able to selectively recognize and sense the pertechnetate anion at μM concentration. In water at pH 2, where the cage is in the hexaprotonated form, pertechnetate recognition is signalled by the quenching of the receptor's emission. Noticeably, environmentally ubiquitous anions, such as chloride, nitrate and sulfate do not interfere in the sensing, as they have no effect on our chemo-sensor's fluorescence. These unprecedented results are promising for the development of simple and smart devices for the recovery of $^{99}$TcO$_4$− from contaminated aqueous solutions.

## Abstract

The selective binding of $^{99}$Tc pertechnetate ($^{99}$TcO$_4$−) in water is a big challenge. Recently, our group reported on the p-xylyl aza-cryptand, as the first molecular receptor for $^{99}$TcO$_4$− in aqueous solution. Here, we show that the introduction of a fluorescent unit in the azacryptand's framework leads to a new molecular system, able to selectively recognize and sense the pertechnetate anion at μM concentration. In water at pH 2, where the cage is in the hexaprotonated form, pertechnetate recognition is signalled by the quenching of the receptor's emission. Noticeably, environmentally ubiquitous anions, such as chloride, nitrate and sulfate do not interfere in the sensing, as they have no effect on our chemo-sensor's fluorescence. These unprecedented results are promising for the development of simple and smart devices for the recovery of $^{99}$TcO$_4$− from contaminated aqueous solutions.

## Statistics

### Citations

12 citations in Web of Science®
13 citations in Scopus®

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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Department of Chemistry 540 Chemistry English 2014 20 Feb 2015 10:03 05 Apr 2016 18:56 RSC Publishing 2041-6520 https://doi.org/10.1039/c3sc53504e