Intriguing assembled structure and properties of a novel dinuclear nickel(II) complex with an axially coordinated azide and methanol

A novel dinickel (II) complex [{Ni(N3)(MeOH)}2(μ-bpypz)2]·2MeOH consisting of doubly bridged anionic 3,5-bis(2-pyridyl)pyrazolate (bpypz−) and axially coordinated azido ions and methanol molecules was prepared and structurally characterized by single crystal X-ray diffraction, IR, Raman, and UV–Vis spectroscopies. The crystal structure reveals that an interesting feature is the formation of a two-dimensional supramolecular network through the π⋯π stacking and the hydrogen bonding interactions. Variable-temperature magnetic susceptibility measurement by using SQUID shows antiferromagnetic interaction between Ni(II) ions (HHDVV = −2JSNi1·SNi2, J = −22.6 cm−1, g = 2.20).