Phthalocyanine-Functionalized Magnetic Silica Nanoparticles as Anion Chemosensors.

João M M Rodrigues, Andreia S F Farinha, Zhi Lin, José A S Cavaleiro, Augusto C Tomé, Joao P C Tome

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Anionic species are one of the most common pollutants in residual and freshwaters. The presence of anthropogenic anions in water drastically increases the toxicity to living beings. Here, we report the preparation of a new optical active material based on tri(tosylamino)phthalocyanines grafted to ferromagnetic silica nanoparticles for anion detection and removal. The new unsymmetrical phthalocyanines (Pcs) proved to be excellent chemosensors for several anions (AcO-, Br-, Cl-, CN-, F-, H2PO4-, HSO4-, NO2-, NO3-, and OH-) in dimethyl sulfoxide (DMSO). Furthermore, the Pcs were grafted onto magnetic nanoparticles. The resulting novel hybrid material showed selectivity and sensitivity towards CN-, F-, and OH- anions in DMSO with limit of detection (LoD) of ≈4.0 µM. In water, the new hybrid chemosensor demonstrated selectivity and sensitivity for CN- and OH- anions with LoD of ≈0.2 µM. The new hybrids are easily recovered using a magnet, allowing recyclability and reusability, after acidic treatment, without losing the sensing proprieties.
Original languageEnglish (US)
Pages (from-to)1632
JournalSensors (Basel, Switzerland)
Issue number5
StatePublished - Mar 3 2021

Bibliographical note

KAUST Repository Item: Exported on 2021-03-05
Acknowledgements: This project had funding for its development from QOPNA, LAQV-REQUIMTE, CICECO, and Centro de Química Estrutural (please see below). Thanks are due to the University of Aveiro, FCT/MCTES and European Union (COMPETE and FEDER programs) for the financial support to CICECO-Aveiro Institute of Materials (UIDB/50011/2020 and UIDP/50011/2020), LAQV-REQUIMTE (UIDB/50006/2020), QOPNA (FCT UID/QUI/00062/2019) and Centro de Química Estrutural (UIDB/00100/2020) research units, as well as to projects PTDC/CTM/101538/2008, PTDC/QEQ-QOR/6160/2014 and PTDC/QUI-QOR/30771/2017, through national funds and, when applicable, co-financed by FEDER–Operational Thematic Program for Competitiveness and Internationalization-COMPETE 2020, within the PT2020 Partnership Agreement.

ASJC Scopus subject areas

  • Biochemistry
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Electrical and Electronic Engineering


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