A rare polyniobotungstate-based framework and its structural transformation in a single-crystal-to-single-crystal process induced by iodide ions

Abstract

The first transition-metal-bridged polyniobotungstate-based 3D framework has been hydrothermally synthesized, which is constructed from bi-[Cu^II(en)₂(H₂O)]-decorating [Nb₃W₃O₁₉]⁵⁻ polyoxoanions linked together by Cu^I ions. Interestingly, the 3D polyniobotungstate framework can undergo a solid–liquid reaction with KI solution to generate a 1D copper halide of [Cu(en)₂][CuI₂]₂ in a single-crystal-to-single-crystal process.