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

  • Shruti Mukherjee
  • Poulami Pal
  • Manoranjan Bar
  • Sujoy Baitalik
Regular Article



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 \(\hbox {F}^{-}\), \(\hbox {OAc}^{-}\) and \(\hbox {CN}^{-}\) among the other studied anions (\(\hbox {F}^{-}\), \(\hbox {Cl}^{-}\), \(\hbox {Br}^{-}\), \(\hbox {I}^{-}\), \(\hbox {CN}^{-}\), \(\hbox {OAc}^{-}\), \(\hbox {H}_{2}\hbox {PO}_{4}^{-}\), \(\hbox {SCN}^{-}\), \(\hbox {BF}_{4}^{-}\) and \(\hbox {ClO}_{4}^{-})\) without selectivity. In contrast to acetonitrile, the complex acts as highly selective chromogenic and fluorogenic sensor for only \(\hbox {CN}^{-}\) in water. Detection limit of the metalloreceptor towards \(\hbox {CN}^{-}\) 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.


Iron complex terpyridine ligand diarylethylene anion sensing cyanide ion 



Financial support received from the Department of Science and Technology, New Delhi, India [Grant No. (EMR/2015/001163 (SERB)] is gratefully acknowledged. TCSPC facility under the DST-PURSE program of Department of Chemistry (JU) is also gratefully acknowledged. S. Mukherjee and P. Pal gratefully acknowledge CSIR for their senior research fellowships and M. Bar acknowledges UGC for his fellowship.

Supplementary material

12039_2018_1484_MOESM1_ESM.pdf (511 kb)
Supplementary material 1 (pdf 511 KB)


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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.Inorganic Chemistry Section, Department of ChemistryJadavpur UniversityKolkataIndia

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