Ln(iii)-Containing polyoxomolybdates based on β-{Mo8O28}: microwave synthesis and optical and magnetic properties

Abstract

Two isomorphic compounds {[Ln₂(H₂O)₁₀](Mo₈O₂₇)}·8H₂O (Ln = Tm (1), Er (2)) were obtained by microwave irradiation, in which β-{Mo₈O₂₈} building units are linked via bridge oxygen and lanthanide ions coordinated with {MoO₆} octahedra. The synthesis chemical processes have a short reaction time (15 min) with high yields (exceeding 85%). The solid-state photochromic properties of these two compounds were studied, and their color change process and the photochromic mechanism were analyzed. Furthermore, the solid-state photoluminescence properties of these two compounds were investigated and the stability of the luminescence was verified. Finally, variable temperature magnetic susceptibilities indicate that both compounds have anti-ferromagnetic interaction properties and 1/χ_M values are linear with temperature.