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

Abstract

. Can. J. Chem. 62, 2755 (1984).The synthesis and study of a series of copper(I1) complexes of a biologically relevant binucleating ligand, 1,4-di(1 '-methyl-2'-imidazolyl)phthalazine (MIP) is reported. The binuclear complex [CuZ(MIP)(OH)Cl3(H20)]HzO has been characterized l~y single crystal X-ray diffraction and belongs to the space group P2,/n with a = 10.063 ( [Traduit par le journal]

Magnetic properties of dinuclear copper(II) complexes with a N6 pyridazine-derived ligand *

“…The overlap of the copper magnetic orbitals and the σ and π orbitals of the nitrogen-containing heterocycles is maximum in a planar arrangement when the Cu᎐N᎐N angle is close to 120Њ. The values reported for the present pyridazine compounds 3 and 4 could explain partially the strong antiferromagnetic interaction [Cu(1)᎐N( 1)᎐N(4) 117.6 (5) and Cu(2)᎐N( 4)᎐N(1) 117.5(6)Њ] for 3 and [Cu(1)᎐N( 1)᎐N(4) 118.2 (8) and Cu(2)᎐N( 4)᎐N(1) 117.0(9)Њ] 4. When the corresponding angle deviates significantly from the ideal value, as observed for triazole 2,20 and indazole 21,22 the exchange decreases.…”

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.…”

Magnetism and structure in a series of halogen and hydroxo-bridged binuclear copper(II) diazine complexes. Structure of a dibromobridged derivative [Cu2(C14H10N4S2)Br4]

“…halogen, NO3, SO,, 1 0 4 can act as a bridge between the two metal centres (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16). Two such ligands, PTP and PAP46Me (Fig.…”

“…I), form not only hydroxo-bridged derivatives, [Cu2(PTP)(OH)X3] (X = C1, Br), [Cu2(PAP46Me)(OH)C13] but also dihalogenobridged compounds [Cu2(PTP)X4] (X = C1, Br), [Cu2(PAP46Me)-C14]. The hydroxo-bridged complexes exhibit antiferromagnetic exchange between the two copper(I1) centres, which is propagated by a superexchange mechanism via the ligand groups that bridge the copper magnetic orbitals (3)(4)(5)(6)(7)9,10). The hydroxide group acts as an important superexchange bridge, while the diazine bridges also contribute significantly to the total exchange with pyridazine being more efficient than phthalazine (16,17).…”