Syntheses, structural characterization, and thermal behaviour of metal complexes with 3-aminopyridine as co-ligands
Franz A. Mautner, Patricia V. Jantscher, Roland C. Fischer, Ana Torvisco, Klaus Reichmann, Salah S. Massoud
Abstract
Abstract Six mixed metal complexes with 3-aminopyridine (3-ampy) as a co-ligand have been synthesized: catena -{[M(μ 2 -3-ampy)(H 2 O) 4 ]SO 4 ·H 2 O} ( M =Ni ( 1 ) and Co ( 2 )), [Co(3-ampy) 4 (NCS) 2 ] ( 3 ), [Co(3-ampy) 2 (NCS) 2 ] ( 4 ), [Co(3-ampy) 4 (N 3 ) 2 ] ( 5 ) and mer -[Co(3-ampy) 3 (N 3 ) 3 ] ( 6 ), (NCS − =isothiocyanate ion, N 3 − azide ion), and characterized by physio-chemical and spectroscopic methods as well as single crystal X-ray and powder diffraction. In the isostructural complexes 1 and 2 single μ 2 -3-ampy links the Ni(II) and Co(II) centers into polymeric chains. The mononuclear Co(II) and Co(III) pseudohalide complexes 3 – 6 reveal only terminal 3-ampy ligands. The 3-ampy ligands form supramolecular hydrogen bonded systems via their NH 2 -groups and non-covalent π-π ring-ring interactions via their pyridine moieties. Thermoanalytical properties were investigated for 1–3 . Graphic abstract