Crystal structure determination and strain analysis of cobalt(III) and copper(II)complexes of hexadentate and tetradentate ligands containing pyridyl arms

Iron(III) Complexes with the Ligand N′,N′‐Bis[(2‐pyridyl)methyl]ethylenediamine (uns‐penp) and Its Amide Derivative N‐Acetyl‐N′,N′‐bis[(2‐pyridyl)methyl]ethylenediamine (acetyl‐uns‐penp)

“…[12,13,[15][16][17][18][19] However, most of the authors unfortunately do not refer to the original synthesis of this ligand by Mandel and co-workers [12] and in one case it is presented a second time and described incorrectly as a new compound (ten years later in the same journal). [14] Some of us have used this ligand previously in studies within the field of copper chemistry and have improved its preparation.…”

Syntheses and characterization of copper complexes of the ligand (2-aminoethyl)bis(2-pyridylmethyl)amine (uns-penp) and derivatives

“…13 The synthesis of uns-penp as well as the copper() complex of the protonated form uns-Hpenp were reported by Mandel and co-workers. 32, 55 Unfortunately, the ligand uns-penp was described as a "new ligand" ten years later by Matouzenko et al using a different synthetic route. 33 A slightly modified synthesis has been described recently by Girerd and coworkers as well as by Rheingold, Bosnich and coworkers.…”

Crystal Structures and Characterization of Copper(II) Complexes of N,N,N'N'-Tetrakis(2-pyridylmethyl)-1,2-ethanediamine

“…1 The crystallographic studies of types [M(tpen)] n+ are well known: M = Co(III), 1,2 Fe(II), 3,4 Fe(III), 5 and Cr(III). 6 These metal complexes are typically mononuclear octahedral, in which the tpen ligand coordinates in a hexadentate manner.…”

“…7,8 The tpen ligand has been used in the present study to prepare a 6-coordinate copper(II) complex, in which the tpen ligand acts as a hexadentate ligand. However, a 5-coordinate copper(II) complex [Cu(tpen)] 2+ (1), in which the tpen acts as a pentadentate ligand, was obtained. The crystal structure of [Cu(tpen)](ClO 4 ) 2 was identified by X-ray crystallography.…”