Coordination Versatility and Amide Shift in Mononuclear Fe^II Complexes with the Asymmetrical Tripod [(6‐Bromo‐2‐pyridyl)methyl][(6‐pivaloylamido‐2‐pyridyl)methyl](2‐pyridylmethyl)amine (BrMPPA)

Abstract

We report in this communication the preparation of the BrMPPA ligand, a new tris(2-pyridylmethyl)amine-type tripod in which di-α-substitution by an amido group and a bromine atom, respectively, provide functionality and sterically induced ligand flexibility. The coordination versatility of this tripod is evidenced by the complete characterization of two dichlorido and di-triflato Fe II complexes in the solid state and in solution. The new tripod can potentially act as a [a]

Steric Congestion at, and Proximity to, a Ferrous Center Leads to Hydration of α-Nitrile Substituents Forming Coordinated Carboxamides

“…HRMS measurements indicated the presence of the α- presence of a bound amide function. 44 Finally, elemental analysis was also carried out and confirmed the formulation of the complex. Taken together, all collected data indicate formation of the bis-carboxamido α-(H 2 NCO) 2 TPAFeCl 2 species, drawn in Scheme 3 as a seven-coordinate complex by analogy to the above-mentioned Fe(II) complex with the parent TPA 2C(O)NHtBu tripod.…”

“…HRMS measurements indicated the presence of the α-(H 2 NCO) 2 TPAFeCl +2 ion with m / z = 233.533 and α-(H 2 NCO) 2 TPAFeCl + – H at m / z = 466.059 (all MS data available in the Supporting Information). Infrared measurements indicated the disappearance of the ν CN = 2239 cm –1 band of the starting material and the presence of two new intense bands at ν CO = 1645 and 1664 cm –1 in line with the presence of a bound amide function . Finally, elemental analysis was also carried out and confirmed the formulation of the complex.…”

Mononuclear iron(ii) complexes containing a tripodal and macrocyclic nitrogen ligand: synthesis, reactivity and application in cyclohexane oxidation catalysis

“…In most of the complexes obtained by reaction of iron(II) salts (Cl or SO 3 CF 3 -) with TPA derivatives, the metal centre adopts a distorted octahedral geometry, where the tripod coordinated in the  4 mode. 40,44,47,48,58,[64][65][66][67][68][69] In contrast, only a few number of complexes display a distorted trigonal-bipyramidal geometry, 40,41,44,48,49 and moreover much less examples, where the metal is in a square-pyramidal environment, are known.…”

Preparation and Structural Characterization of o-Ethyl Formate Phenylacetic Acid

“…Many metal-organic hybrid materials show interesting structure and excellent use in structural versatility, inhibitory activity, antitumor activity and gas adsorption [6][7][8][9][10]. However, the studies on Ca(II) ion complex materials are relatively few compared with other metal cations [11,12].…”