Syntheses and Properties of Dinuclear Copper(II) Complexes with 2,6-Bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol

The dinucleating ligand, 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol](Hbpmp), formed two types of dinuclear copper(II) complexes, [Cu2(bpmp)X2]n+(X=Cl−, N3− py(pyridine), or Him(imidazole), and n=1 or 3), and [Cu2(bpmp)X]2+(X=CH3COO− or im−). On the basis of the dinucleating nature of the ligand (bpmp), the elemental analyses and the conductivity measurements in acetonitrile, it is concluded that the complexes have dimeric unit of [Cu2(bpmp)X2]n+ or [Cu2(bpmp)X]2+. In [Cu2(bpmp)X2]n+ type complexes, two copper(II) ions are linked only by a single phenolate bridge. Magnetic susceptibilities of those complexes obey Curie-Weiss law in the temperature range 80–300 K with the Weiss constants ≈−4 K, indicating that weak antiferromagnetic interactions are present in these complexes. In [Cu2[bpmp)X]2+ type complexes, however, two copper(II) ions are bridged by phenolate and acetate, or phenolate and imidazolate. Cryomagnetic measurements of the acetato and the imidazolato complexes showed antiferromagnetic interactions with the −2J values of 82 and 66 cm−1, respectively. All the complexes exhibited absorption bands at 20000–22000 cm−1 except for the azido complex. The origin of those bands are discussed.