Synthesis and transition metal coordination chemistry of a novel hexadentate bispidine ligand. Issue 6 (25th November 2014)

• Record Type: Journal Article
• Authors: Comba, Peter; Rudolf, Henning; Wadepohl, Hubert
• Is Part Of: Dalton transactions. Volume 44:Issue 6(2015)
• Page Start: 2724
• Page End: 2736
• Publication Date: 2014-11-25
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c4dt03262d
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : With the hexadentate bispidine ligand, the Cu II and Fe II (red) complexes are hexacoordinated with a semi-coordinated py4, the Mn II complex (green) is heptacoordinated. Abstract : Reported is the new bispidine-derived hexadentate ligandL (L = 3-(2-methylpyridyl)-7-(bis-2-methylpyridyl)-3, 7-diazabicyclo[3.3.1]nonane) with two tertiary amine and four pyridine donor groups. This ligand can form heterodinuclear and mononuclear complexes and, in the mononuclear compounds discussed here, the ligand may coordinate as a pentadentate ligand, with one of the bispyridinemethane-based pyridine groups un- or semi-coordinated, or as a hexadentate ligand, leading to a pentagonal pyramidal coordination geometry or, with an additional monodentate ligand, to a heptacoordinate pentagonal bipyramidal structure. The solution and solid state data presented here indicate that, with the relatively small Cu II and high-spin Fe II ions the fourth pyridine group is only semi-coordinated for steric reasons and, with the larger high-spin Mn II ion genuine heptacoordination is observed but with a relatively large distortion in the pentagonal equatorial plane.