Chromogenic and fluorogenic detection of selected anions by bis-terpyridine Fe(II) complex through displacement approach

This paper deals with synthesis, characterization and anion recognition properties of a homoleptic bis-terpyridine Fe(II) complex covalently coupled with diarylethene unit. The recognition event was examined in both organic as well as mixed aqueous–organic medium through different optical channels a...

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Bibliographic Details
Published in:Journal of chemical sciences (Bangalore, India) India), 2018-07, Vol.130 (7), p.1-11, Article 84
Main Authors: Mukherjee, Shruti, Pal, Poulami, Bar, Manoranjan, Baitalik, Sujoy
Format: Article
Language:English
Subjects:
Acetonitrile
Anions
Channels
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Coordination compounds
Cyanides
Recognition
Regular Article
Spectroscopy
Titration
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Summary:This paper deals with synthesis, characterization and anion recognition properties of a homoleptic bis-terpyridine Fe(II) complex covalently coupled with diarylethene unit. The recognition event was examined in both organic as well as mixed aqueous–organic medium through different optical channels and spectroscopic techniques by taking advantage of metal–ligand interaction in the complex. The complex acts as sensor for F - , OAc - and CN - among the other studied anions ( F - , Cl - , Br - , I - , CN - , OAc - , H 2 PO 4 - , SCN - , BF 4 - and ClO 4 - ) without selectivity. In contrast to acetonitrile, the complex acts as highly selective chromogenic and fluorogenic sensor for only CN - in water. Detection limit of the metalloreceptor towards CN - was determined from the absorption and emission titration data and the observed values lie in the order of 10 - 9 M in acetonitrile and 10 - 8 M in mixed aqueous–organic media. Graphical Abstract SYNOPSIS Anion sensing property of a bis-terpyridine Fe(II) complex was thoroughly investigated in both acetonitrile and water–acetonitrile (100:1, v/v) media through different optical channels and spectroscopic techniques. Interestingly, the complex acts as chromogenic and fluorogenic receptor for cyanide in predominantly aqueous medium with very low detection limit.
ISSN:0974-3626
0973-7103
DOI:10.1007/s12039-018-1484-6