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A Ternary Fe(II)-terpyridyl Complex-based Single Platform for Reversible Multiple-ion Recognition

Abstract

Multiple ion-recognition activity by a ternary Fe(II)-terpyridyl complex, [Fe(PhT)(PT)]2+ (1) (PhT = 4'-phenyl-2,2':6',2''-terpyridine; PT = 4’-pyridyl-2,2’:6',2''-terpyridine) is demonstrated for cyanide (CN‾), fluoride (F‾) and hydroxide (OH‾) ions in aqueous medium with sufficient sensitivity, fast response, reproducibility and selectivity with dual optical read-out. The sensing event was reversible with “by-eye” visualization of back and forth colour changes. Three cyanide ions replaced PT from 1, as observed from the crystal structure of 1+CN‾ couple. Fluoride and hydroxide ions appeared to show multivariate interactions with 1. Observed structural and spectral changes correlated well with theoretical calculations. A string of cations at quantitative levels (Ag+/Hg2+/Fe2+/Fe3+) were used to decouple 1+anion complex to yield 1, which enabled the recognition of these cations while permitting the reuse of 1 for at least five set-reset cycles.

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Publication details

The article was received on 08 Feb 2018, accepted on 04 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8DT00539G
Citation: Dalton Trans., 2018, Accepted Manuscript
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    A Ternary Fe(II)-terpyridyl Complex-based Single Platform for Reversible Multiple-ion Recognition

    A. K. Singh, G. Pandey, K. Singh, A. Kumar, M. Trivedi and V. Singh, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT00539G

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