Abstract
Four new low melting salts, “Ionic Liquids” consisting of the [CrIII(NCS)4(Phen)]− complex monoanion and imidazolium based cations A, with A = 1-ethyl-3-methylimidazolium (EMIm), 1-butyl-3-methylimidazolium (BMIm), 1,3-dimethyl-2,4,5-triphenylimidazolium (DML), and 1,2,3,4,5-pentamethyl-imidazolium (PMIm), were investigated. Single-crystal X-ray investigations established the structures of the four compounds. (EMIm)[Cr(NCS)4(Phen)] (I): triclinic, $$P\bar 1$$ , a = 8.1382(6), b = 10.4760(8), c = 16.003(1) A, α = 90.330(4)°, β = 94.759(4)°, γ = 107.305(4)°, Z = 2, R 1(F)/wR 2(F 2) = 0.0650/0.1770; (BMIm)[Cr(NCS)4(Phen)] (II): triclinic, $$P\bar 1$$ , a = 8.5545(4), b = 9.8620(4), c = 16.6762(6) A, α = 92.503(2)°, β = 97.517(2)°, γ = 91.249(2)°, Z = 2, R 1(F)/wR 2(F 2) = 0.0393/0.0848; (DML)[Cr(NCS)4(Phen)] · C3H6O (III): triclinic, $$P\bar 1$$ , a = 11.0475(9), b = 13.589(1), c = 14.582(1) A, α = 83.013(4)°, β = 87.116(4)°, γ = 70.333(5)°, Z = 2, R 1(F)/wR 2(F 2) = 0.0407/0.1023; (PMIm)[Cr(NCS)4(Phen)] · C3H6O (IV): orthorhombic, Pbca, a = 17.379(1), b = 16.514(1), c = 22.304(1) A, Z = 8, R 1(F)/wR 2(F 2) = 0.0460/0.1107 (in addition III and IV contain co-crystallized acetone molecules). Each compound was characterized by elemental analysis, NMR, IR, und UV-Vis spectroscopy. Magnetic properties were derived from NMR investigations (EVANS method). All four compounds are paramagnetic with effective magnetic moments of spin-only CrIII. Melting points were obtained from DSC measurements. All melting points are higher than required for “Ionic Liquids”, but nevertheless “low” for molten salts.
Published Version
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