Abstract
Crystals of four new copper(II) complexes have been grown from copper(II) acetate/chloride-1-ethyl-3-methyl-imidazolium acetate/chloride-water systems and characterized by X-ray analysis. The first complex, bis-(1-ethyl-3-methyl-imidazolium) tetra-μ-acetato-bis[chloridocuprate(II)], [Emim]2[Cu2(C2H3O2)4Cl2] (1) (Emim is 1-ethyl-3-methyl-imidazolium, C6H11N2), contains [Cu2(C2H3O2)4Cl2]2- coordination anions with a paddle-wheel structure and ionic liquid cations. Two of the synthesized complexes are one-dimensional polymers, namely catena-poly[1-ethyl-3-methyl-imidazolium [[tetra-μ-acetato-dicuprate(II)]-μ-chlorido] monohydrate], {[Emim][Cu2(C2H3O2)4Cl]·H2O} n (2), and catena-poly[1-ethyl-3-methyl-imidazolium [[tetra-μ-acetato-dicuprate(II)]-μ-acetato]], {[Emim][Cu2(C2H3O2)5]} n (3). In these compounds, the Cu2(C2H3O2)4 units with a paddle-wheel structure are connected to each other through chloride (in 2) or acetate (in 3) anions to form parallel chains, between which cations of ionic liquid are situated. The last compound, bis-(1-ethyl-3-methyl-imidazolium) tetra-μ-acetato-bis[aquacopper(II)] tetra-μ-acetato-bis[acetatocuprate(II)] dihydrate, [Emim]2[Cu2(C2H3O2)4(H2O)2][Cu2(C2H3O2)6]·2H2O (4), contains two different binuclear coordination units (neutral and anionic), connected through hydrogen bonds between water mol-ecules and acetate ions.
Highlights
2005; Ahmed & Ruck, 2011; Betz et al, 2011; Jlassi et al, 2014)
The use of Ionic liquids (ILs) as unique solvents for the replacement of traditional solvents and the synthesis of new substances from ionic liquids are the goals of many investigations
Many oxidation reactions in organic syntheses are catalysed by copper(II) compounds, which is why the synthesis and structural investigation of copper(II) complexes grown from ILs are real scientific tasks
Summary
Ionic liquids (ILs) with melting point below 373 K were discovered in 1888 (Gabriel & Weiner, 1888), but have been specific laboratory substances for a long time. It is important that the properties of ionic liquids can be varied by structural design, and by mixing with other substances, especially with water (Kohno & Ohno, 2012). The use of ILs as unique solvents for the replacement of traditional solvents and the synthesis of new substances from ionic liquids are the goals of many investigations. The application of ILs has already allowed the synthesis of new polyoxometallates, transition metal clusters, main-group element clusters and nanomaterials; the most important catalytic organic syntheses have been performed in ionic liquids under mild conditions Many oxidation reactions in organic syntheses are catalysed by copper(II) compounds, which is why the synthesis and structural investigation of copper(II) complexes grown from ILs are real scientific tasks. The new complexes 1-4 have been obtained from the same and similar (where the acetate ion is replaced by chloride) systems and their structures investigated by single crystal X-ray analysis
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