Structural Diversity in Metal Complexes with a Dinucleating Ligand Containing Carboxyamidopyridyl Groups

Abstract

The synthesis of a carboxyamidopyridine-pyrazolate dinucleating ligand (H5bppap) is described. Bimetallic iron and cobalt complexes of H5bppap ([MII2H2bppap]+) showed structural differences in both their primary and secondary coordination spheres. The binding of small molecules into the pre-organized ligand cavity is verified by the hydration of [FeII2H2bppap]+ and [CoII2H2bppap]+, leading to the formation of the complexes [{CoII(OH)}CoIIH3bppap]+ and [{FeII(OH)}-FeIIH3bppap]+, in which one of the metal centers has a terminal hydroxo ligand.

Insight into Bio-metal Interface Formation in vacuo: Interplay of S-layer Protein with Copper and Iron

“…This group may also participate in the reaction that results in the metal oxidation (Figure 6B). A similar peptide bond deprotonation with a subsequent donor-acceptor bonding to a 3d metal ion has been previously reported4647.…”

Preparation and structures of dinuclear complexes containing MII–OH centers

“…In addition, our ligands include H-bond donors within the secondary coordination sphere to form intramolecular H-bonding networks with the M–OH units; 9,7d these types of noncovalent interactions have previously been exploited in the isolation of mononuclear M–OH analogues. 10 Two earlier versions of this design contained urea ([H 4 P R buam] 5- ) 11 and carboxyamidopyridyl ([H 3 bppap] 2- ) 12 groups (Fig. 1) but we were unable to prepare dinuclear M–OH complexes.…”

(3-Acetyl-4-methyl-1H-pyrazol-1-ide-5-carboxylato)bis(1,10-phenanthroline)nickel(II) 3.5-hydrate

“…The work presented here continues studies of complexes based on pyrazolate ligands with transition metals, see: Klingele et al (2009); Malinkin et al (2009Malinkin et al ( , 2012a; Ng et al (2011); Penkova et al (2008Penkova et al ( , 2009; Meyer & Pritzkow (2000); Bauer-Siebenlist et al (2005); Ś wią tek- Kozłowska et al (2000). For related structures, see: Zhong et al (2009); Zheng et al (2009); Bouchene et al (2013); Fang & Wang (2010); Fritsky et al (2004Fritsky et al ( , 2006; Kanderal et al (2005); Moroz et al (2010).…”