Relation between structure and spectra of pseudo-tetrahedral copper(II) complexes. Crystal structure of bis(di-2-pyridylamido)copper(II)

Redetermination of [bis(2-pyridyl)amine-N,N′]copper(II) diperchlorate

“…The degree of distortion from planar towards tetrahedral can be re¯ected by the dihedral angle between the N1ÐCuÐN2 and N1 i ÐCu1ÐN2 i planes, 54.9 (4) [symmetry code: (i) Àx, y, -z + 1 2 ]. The CuÐN bond distances (Table 1) are almost equivalent [1.971 (2) and 1.977 (2) A Ê ], which are similar to the value of the analogous complexes (Ray et al, 1982;Rodig et al, 1981;Spodine et al, 1996).…”

Diazidobis(2,2′-dipyridylamine)nickel(II) monohydrate

“…The anti±anti con®guration, referring to the relation of the pyridyl N atoms to the amine H atom, has been found in many bidentate chelate complexes (e.g. Rodig et al, 1981;Youngme et al, 1998;Mesa et al, 1998). The syn±syn con®guration occurs in trinuclear complexes (Pyrka et al, 1991;Wu et al, 1990), and the anti±syn con®guration exists in the dimer of the free ligand (Yang et al, 1994).…”

Role of ligand conformation in the structural diversity of divalent complexes containing phosphinic amide ligand

“…1, top). In the bidentate mode of coordination, the two pyridyl nitrogen atoms are arranged in a cis conformation, which was found in the crystal structure of a copper(II) complex [1], while the trans conformation was found in the crystal structure of the free Hdpa ligand [2]. The dpa − ligands in the linear trinuclear complexes were found to possess the aligned conformations [3], in which the three nitrogen atoms are arranged in a near linear array for coordination to the metals.…”