AUTHOR=Dar Tawseef Ahmad , Sankar Muniappan 

TITLE=Fused Nickel(II) Porphyrins—Sensing of Toxic Anions and Selected Metal Ions Through Supramolecular Interactions

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.595177

DOI=10.3389/fchem.2020.595177

ISSN=2296-2646

ABSTRACT=<p>Ni(II) porphyrins having fused –NH group were synthesized and characterized by various spectroscopic techniques. The fused porphyrins <bold>1</bold> and <bold>2</bold> were used to detect species of opposite polarity. <bold>1</bold> was used to sense toxic anions <italic>viz</italic>. cyanide and fluoride ions whereas <bold>2</bold> was used for detecting some selective metal ions including toxic mercury(II) ions. <bold>1</bold> is having acidic –NH proton, which detects anions <italic>via</italic> hydrogen bonding interactions followed by anion-induced deprotonation. On the other hand, <bold>2</bold> senses the metal species <italic>via</italic> weak charge transfer interactions from oxygen atom of the formyl group to the added metal ions. The limit of detection was calculated in case of <bold>1</bold> as 2.13 and 3.15 ppm for cyanide and fluoride ions, respectively. Similarly, the detection limit was found to be 0.930, 2.231, and 0.718 ppm for Cu(II), Fe(III), and Hg(II) ions, respectively, for probe <bold>2</bold>. The probes were recovered and reused for several cycles.</p>