315672-52-7Relevant academic research and scientific papers
Triangular {Ni3} coordination cluster with a ferromagnetically coupled metal-ligand core
Schmitz, Sebastian,van Leusen, Jan,Izarova, Natalya V.,Bourone, Svenja D.M.,Ellern, Arkady,K?gerler, Paul,Monakhov, Kirill Yu.
, p. 144 - 151 (2018)
The coordination characteristics of a tridentate, π-conjugated Schiff base (HL·SMe) combined with 4-(methylthio)benzoic acid (Hbza·SMe) were explored in methanol solution. A two-step aerobic process involving the precursor NiCl2·6H2O afforded the trinuclear coordination compound [NiII3(L·SMe)4(bza·SMe)(MeOH)2]Cl0.5(CH3O)0.5·5.5MeOH·H2O (1), while the precursor Ni(ClO4)2·6H2O resulted in [NiII3(L·SMe)4(bza·SMe)(MeOH)2](ClO4)0.75(CH3O)0.25·1.5MeOH·0.75H2O (2); in both cases the thioether-containing ligands are key to isolation of crystalline products. Their solvent-free cationic motif [Ni3(L·SMe)4(bza·SMe)]+, supported by two different types of monodeprotonated chelate ligands, has been studied by electrospray ionization mass spectrometry. 1 and 2 crystallize in the triclinic space group P1ˉ and monoclinic space group Cc, respectively, and feature a hitherto not observed triangular metal-ligand skeleton that is characterized by predominantly ferromagnetic exchange coupling between Ni(II) ions. Proof-of-concept infrared reflection–absorption spectroscopy measurements of 1 deposited on a gold substrate indicate that this moisture-stable compound retains its main structural features upon adsorption on the metal surface, which enables subsequent studies of catalytic properties of 1 on a solid support.
