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Selective recognition of Fe3+ and CrO42- ions using Zn(II) metallacycle and Cd(II) coordination polymer and their heterogeneous catalytic application

Abstract

We report the syntheses and structural characterization of a Zn(II) metallacycle [Zn2{(L)2(DMF)2(NO3)2}]·(NO3)2 (1) along with a Cd(II) coordination polymer [{Cd1(L)2(DMF)2}·(NO3)2]n (2) (where L = N,N'-bis-(3-pyridyl)terephthalamide; DMF = dimethylformamide) and their utilization as fluorescent probe for the highly selective recognition (turn-off) of Fe3+ and CrO42− ions. Compounds 1 and 2 were prepared by utilizing ligand L and nitrate salt of zinc and cadmium, respectively. A single crystal X-ray analysis reveals that 1 adapts an overall Zn(II) metallacycle architecture, whereas, 2 displays one-dimensional (1D) polymeric structure. Both 1 and 2 showed high fluorescence stability in aqueous solution and selectively detect Fe3+ and CrO42- ions with high quenching constant and low detection limits of 2.34 × 106 M-1 and 0.153 µM for Fe3+, 6.72 × 105 and 0.205 µM for CrO42– (for 1); 3.25 × 106 and 0.193 µM for Fe3+, 6.94 × 105 and 0.155 µM for CrO42– (for 2). Notably, the ligand L itself did not display any type of molecular recognition for any ions in DMF as well as in aqueous media. Moreover, 1 and 2 were also exploited as heterogeneous catalysts for the ring-opening reaction (ROR) of epoxides with various assorted amines and observed up to 95% yield (TON, 47.5 and TOF, 11.9 h-1) with perfect regioselectivity in case of styrene oxide.

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Publication details

The article was received on 28 Aug 2019, accepted on 28 Oct 2019 and first published on 30 Oct 2019


Article type: Paper
DOI: 10.1039/C9CE01357A
CrystEngComm, 2019, Accepted Manuscript

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    Selective recognition of Fe3+ and CrO42- ions using Zn(II) metallacycle and Cd(II) coordination polymer and their heterogeneous catalytic application

    G. Kumar, P. Rani, A. Sharma, A. Husain, G. Kumar, H. Kaur and K.k Bhasin, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE01357A

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