Mononuclear and binuclear copper(II) complexes of some polyfunctional pyridyl phthalazines

Abstract

. J. Chem. 61, 57 (1983).Mononuclear and binuclear copper(I1) complexes of the potentially tetradentatc binucleating ligands 1,4-di(3'-methyl-2'-pyridy1)aminophthalazine (PAP3Me) and 1,4-di(5'-methyl-2'-pyridyl)aminophthalazine (PAP5Me) are reported. In the case of the ligand 1,4-di(4',6'-dimethyl-2'-pyridyl)aminophthalazine (PAP46DiMe) only binuclear derivatives were obtained. ' The mononuclear complexes, involving protonated ligand, result from the sensitivity of these ligands to mildly acidic conditions in aqueous solutions of certain copper salts. Binuclear, neutral ligand, complexes are also formed when the pH increases. Hydroxy bridged binuclear structures exist in all the binuclear complexes described with the exception of one acetate bridged derivative. Sub normal magnetic moments are observed for all the binuclear complexes (< 1.74 BM) indicating spin coupled systems with very low values (<0.88 BM) for binuclear complexes of PAP46DiMe, indicating the possibility of strong antiferromagnetic exchange between the metal centres.

Binuclear copper(II) complexes of the ligand 1,4-di(1′-methyl-2′-imidazolyl)phthalazine. Structure and magnetism of a hydroxyl bridged derivative

“…A similar situation has been observed with other phthalazine ligands (20)(21)(22) although in these cases, in aqueous solution, the pH of the system Can. J. Chem.…”

Synthesis and magnetostructural characterization of dinuclear copper(II) complexes with the diazine ligand, 3,6-bis(di-2-pyridylmethyl)pyridazine

“…This previously unreported hexadentate ligand has two pyridine groups bonded in ortho positions on each side of the N-N fragment of the pyridazine molecule through a methyl group. This N, ligand bears a certain resemblance to the tetradentate ligands reported by [6][7][8][9][10][11][12][13][14][15][16][17] with the difference that it can produce octahedral instead of square-pyramidal species. cm--l) 12.15.17 1 lists the atomic parameters with estimated standard deviations.…”

Tetranuclear, Hexanuclear, and Octanuclear Copper(II) Complexes of a Series of Novel Dendritic Poly(phthalazine) Ligands

“…Found: C, 65.65; H, 4.33; N, 24.06. Mass spectrum, major mass peaks in m/z (relative intensity): 643 (22), 642 (P) (65), 550 (14), 548 (13), 455 (22), 320 (9), 94 (24), 78 (100). mass peaks in m/z (relative intensity): 626 (P -Py) (12), 609 (5), 532 (29), 455 (3), 440 (2), 352 (7), 313 (3), 170 (3), 155 (2), 94 (3), 78 (100).…”