Low-melting cationic 3d-transition metal complexes of azole-based ligands. (17th June 2015)

• Record Type: Journal Article
• Authors: Huxel, Timo; Skaisgirski, Michael; Klingele, Julia
• Is Part Of: Polyhedron. Volume 93(2015)
• Page Start: 28
• Page End: 36
• Publication Date: 2015-06-17
• Subjects: Ionic liquid -- N-ligand -- Chelating ligand -- Iron(II) -- Bis(trifluoromethylsulfonyl)imide; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2015.03.020
• Languages: English
• ISSNs: 0277-5387

Abstract

Abstract : Graphical abstract: EvenL 1 [2-(2-pyridyl)-1-ethylimidazole] with the relatively short ethyl tag, in combination with NTf2 −, is able to form low-melting complexes. Also most complexes of the methoxyethyl-tagged ligandL 2 [2-(2-pyridyl-1-(2-methoxyethyl)imidazole] are low-melting with T fus < 200 °C and have glass transitions below 75 °C upon reheating. Abstract: Ligands N -methylimidazole (MIm ) and N -ethylimidazole (EIm ) were used for the preparation of [Fe II (L )6 ](NTf2 )2 ·0.5EtOH·0.5H2 O. With T fus = 83 °C, theEIm complex was characterised as paramagnetic MeIL. Using bidentate imidazole ligands 2-(2-pyridyl)-1-ethylimidazole (L 1 ) and 2-(2-pyridyl)-1-(2-methoxyethyl)imidazole (L 2 ) 3:1 type complexes [M II (L i )3 ]X2 (M = Fe;L i = L 1 ; X = ClO4, BF4, NTf2 ; M = Fe;L i = L 2, X = ClO4, BF4 ; M = Co; X = ClO4 ;L i = L 1, L 2 ; M = Ni; X = ClO4 ;L i = L 1, L 2 ) were prepared. All complexes ofL 2 and complex [Fe II (L 1 )3 ](NTf2 )2 were low-melting with T fus < 200 °C. Complexes ofL 2 additionally had glass transition temperatures below 75 °C upon reheating.