Syntheses, structural characterization, and thermal behaviour of metal complexes with 3-aminopyridine as co-ligands

Abstract

Six mixed metal complexes with 3-aminopyridine (3-ampy) as a co-ligand have been synthesized: catena-{[M(μ2-3-ampy)(H2O)4]SO4·H2O} (M=Ni (1) and Co (2)), [Co(3-ampy)4(NCS)2] (3), [Co(3-ampy)2(NCS)2] (4), [Co(3-ampy)4(N3)2] (5) and mer-[Co(3-ampy)3(N3)3] (6), (NCS−=isothiocyanate ion, N3− 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 μ2-3-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 NH2-groups and non-covalent π-π ring-ring interactions via their pyridine moieties. Thermoanalytical properties were investigated for 1–3. Graphic abstract

Crystal Packing Studies, Thermal Properties and Hirshfeld Surface Analysis in the Zn(II) Complex of 3-Aminopyridine with Thiocyanate as Co-Ligand

“…The medium peak at 1581 cm −1 is assigned to NH 2 deformation vibration [19]. The very strong C ≡ N asymmetric stretching vibrations of the SCN − are observed at 2109 cm −1 in the spectrum of the complex, indicating that it has taken part in bonding [17]. The ν C=N stretching modes of the pyridine ring shifted from 1595 to 1623 cm −1 in the spectrum of the complex, indicating its participation in bonding.…”

“…As a bidentate ligand, it coordinates through the pyridyl N-atom and the amino N-atom [19]. Supramolecular structures of higher dimensionality have been achieved with this ligand in the monodentate coordination mode and the pendant amino group serving as potential H-bond donor or acceptor sites [17] [19].…”

Synthesis, Crystal Structure, and Analysis of Hirshfeld Surface of Hexa (4‐Aminopyridine) Triscopper(II) Carbonate Trihydrate

“…[33][34][35] Transition metals are important tools and are analyzed to develop molecule drug development interactions. [36][37][38] Due to their great affinity with electrons, reactivity, and shape, transition metals are employed to generate medications that are effective against cancer. [39,40] Organic-metal coordination crystals have attracted attention in material science due to their versatile applications in luminescence, magnetism, and catalysis.…”

Synthesis, Structural Determination and Antibacterial Properties of Zinc(II) Complexes Containing 4-Aminopyridine Ligands

“…Moreover, complexes with aminopyridine have been studied due to their potential as antibacterial agents [2][3][4]. Complexes with aminopyridine ligand such as poli-[Cu(NCS) 2 (x-NH 2 py) 2 ] [2], [Cd(μ-L) 2 (NH 2 py) 2 ] (L = SCN − , dca, N 3 − ) [5][6][7], [Mn(L) 2 (3-NH 2 py) 2 ] (L = dca, SCN − ) [5][6]8] and [Co(dca) 2 (2-NH 2 py) 2 ] [3] have shown to form a polymeric structure through bidentate ligands such as dicyanamide ion (dca), nitride ion (N 3 − ) and ambidentate ligand such as SCN − . The polymeric complexes can be obtained as long as octahedral coordination of the metal center is preserved, whereas complex compounds with tetrahedral geometry such as [Zn(NCS) 2 (x-NH 2 py) 2 ] (x = 2 and 3) [9][10], [Zn(CN) 2 (x-NH 2 py) 2 ] [11], [MCl 2 (x-NH 2 py) 2 ] (M = Zn(II), Co(II) [4,12] tend to form monomeric complexes [9,[13][14].…”