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Synthesis and characterization of ionic liquids containing copper, manganese, or zinc coordination cations
Harry D. Pratt III,Alyssa J. Rose,Chad L. Staiger,David Ingersoll,Travis M. Anderson
Dalton Transactions Pub Date : 08/11/2011 00:00:00 , DOI:10.1039/C1DT10973A
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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