Syntheses, structures, and magnetic properties of a novel mer-[(bbp)FeIII(CN)3]2- building block (bbp : bis(2-benzimidazolyl)pyridine dianion) and its related heterobimetallic Fe(III)-Ni(II) complexes Article - 2012

Anangamohan Panja, Philippe Guionneau, Ie-Rang Jeon, Stephen M. Holmes, Rodolphe Clérac, Corine Mathonière

Anangamohan Panja, Philippe Guionneau, Ie-Rang Jeon, Stephen M. Holmes, Rodolphe Clérac, Corine Mathonière, « Syntheses, structures, and magnetic properties of a novel mer-[(bbp)FeIII(CN)3]2- building block (bbp : bis(2-benzimidazolyl)pyridine dianion) and its related heterobimetallic Fe(III)-Ni(II) complexes  », Inorganic Chemistry, 2012, pp. 12350-12359. ISSN 0020-1669

Abstract

A new symmetrical tricyanide building block mer-[Fe(bbp)(CN)(3)](2-) [1 ; bbp = bis(2-benzimidazolyl)pyridine dianion] has been prepared and structurally and magnetically characterized. It forms a new low-spin meridionally capped Fe(III)L(CN)(3) fragment with the tridentate bbp ligand. The reaction of 1 with Ni(II) salts in the presence of various ancillary ligands affords several new cyanido-bridged complexes : a trinuclear complex [Ni(ntb)(MeOH)](2)[Fe(bbp)(CN)(3)][ClO(4)](2)*2MeOH (2), a tetranuclear compound [Ni(tren)](2)[Fe(bbp)(CN)(3)](2)*7MeOH (3), and a one-dimensional heterobimetallic system : [Ni(dpd)(2)](2)[Fe(bbp)(CN)(3)](2)*9MeOH*3H(2)O (4) [ntb = tris(2-benzimidazolylmethyl)amine, tren = tris(2-aminoethyl)amine, and dpd = 2,2-dimethyl-1,3-propanediamine]. The structural data shows that 2 is a linear complex in which a central Fe(III) ion links two adjacent Ni(II) ions via axial cyanides, while 3 is a molecular square that contains cyanido-bridged Ni(II) and Fe(III) ions at alternate corners. Complex 4 is a one-dimensional system that is composed of alternating cyanido-bridged Ni(II) and Fe(III) centers. Compounds 2-4 display extensive hydrogen bonding and moderately strong π-π stacking interactions in the solid state. Magnetic studies show that ferromagnetic exchange is operative within the Fe(III)(LS)(μ-CN)Ni(II) units of 2-4.

Voir la notice complète sur HAL

Actualités