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Issue 43, 2011
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Synthesis and characterization of ionic liquids containing copper, manganese, or zinc coordination cations

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Abstract

Copper-, manganese-, and zinc-based ionic liquids (Cu{NH2CH2CH2OH}6[CH3(CH2)3CH(C2H5)CO2]2 (2), Cu{NH(CH2CH2OH)2}6[CH3(CH2)3CH(C2H5)CO2]2 (3A), Cu{NH(CH2CH2OH)2}6[CF3SO3]2 (3B), Cu{NH(CH2CH2OH)2}6[(CF3SO2)2N]2 (3C), Mn{NH(CH2CH2OH)2}6[CF3SO3]2 (4), and Zn{NH2CH2CH2OH}6[CF3SO3]2 (5)) are synthesized in a single-step reaction. Infrared data suggest that ethanolamine preferentially coordinates to the metal center through the amine group in 2 and the hydroxyl group in 5. In addition, diethanolamine coordinates through the amine group in 3A, 3C, and 4 and the hydroxyl group in 3B. The compounds are viscous (>1000 cP) at room temperature, but two (3C and 4) display specific conductivities that are reasonably high for ionic liquids (>20 mS cm−1). All of the compounds display a glass transition (Tg) below −50 °C. The cyclic voltammograms (CVs) of 2, 3A, 3B, and 3C display a single quasi-reversible wave associated with Cu(II)/Cu(I) reduction and re-oxidation while 5 shows a wave attributed to Zn(II)/Zn(0) reduction and stripping (re-oxidation). Compound 4 is the first in this new family of transition metal-based ionic liquids (MetILs) to display reversible Mn(II)/Mn(III) oxidation and re-reduction at 50 mV s−1 using a glassy carbon working electrode.

Graphical abstract: Synthesis and characterization of ionic liquids containing copper, manganese, or zinc coordination cations

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Publication details

The article was received on 24 May 2011, accepted on 24 Jun 2011 and first published on 11 Aug 2011


Article type: Paper
DOI: 10.1039/C1DT10973A
Citation: Dalton Trans., 2011,40, 11396-11401
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    Synthesis and characterization of ionic liquids containing copper, manganese, or zinc coordination cations

    H. D. Pratt III, A. J. Rose, C. L. Staiger, D. Ingersoll and T. M. Anderson, Dalton Trans., 2011, 40, 11396
    DOI: 10.1039/C1DT10973A

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