Synthesis and transition metal coordination chemistry of a novel hexadentate bispidine ligandElectronic supplementary information (ESI) available. CCDC 1030274-1030279. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c4dt03262d

• Main Authors: Comba, Peter, Rudolf, Henning, Wadepohl, Hubert
• Format: Journal Article
• Language: English
• Published: 28.01.2015
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/c4dt03262d

Reported is the new bispidine-derived hexadentate ligand L (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. 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.