Magnetic and luminescence properties of an inorganic 3D nickel–vanadium bimetallic framework

Abstract

A novel nickel–vanadium bimetallic compound [Ni(H₂O)₂V₂O₆] (1) has been hydrothermally prepared and characterized by IR spectroscopy, elemental analysis, powder X-ray diffraction, thermogravimetric analysis, and X-ray single-crystal diffraction. Compound 1 exhibits an interesting purely inorganic 3D framework with a pair of entangled double helices, constructed by a {NiO₄(H₂O)₂} octahedron and a {VO₄} tetrahedron arranged alternately to each other. The magnetic behavior demonstrates the antiferromagnetic interactions transmitted by a pair of O–V–O bridges. Besides, luminescence measurements exhibit an intense broad emission maximum at λ ≈ 525 nm owing to the O → V charge transfer within the {VO₄} groups.