Canted Ferromagnetism in a Ni^II Chain with a Single End-to-End Azido Bridge

Ferromagnetic coupling between metal centers and end-to-end coordination of the azido bridges were found together for the first time in the one-dimensional nickel(II) compound [{Ni(5-methylpyrazole)₄(N₃)}_n](ClO₄)_n⋅n H₂O (1; the structure in the unit cell is shown). The ferromagnetic coupling involving spin canting occurs between the two crystallographically distinct types of magnetic centers in 1 owing to a large Ni-N₃-Ni torsion angle of 75.7° and a dihedral angle of 60.6° between two types of NiN₄ least-squares planes.