Yellow to greenish-blue colour-tunable photoluminescence and 4f-centered slow magnetic relaxation in a cyanido-bridged DyIII(4-hydroxypyridine)–CoIII layered material

Abstract

A cyanido-bridged layered {[Dy^III(4-OHpy)₂(H₂O)₃][Co^III(CN)₆]}·0.5H₂O (1) (4-OHpy = 4-hydroxypyridine) framework with dual photo-luminescence and magnetic properties was prepared. 1 exhibits visible emission whose color, yellow to greenish-blue, is switchable by selected wavelengths of UV excitation light. Magnetic data revealed that 1 shows not only the slow magnetic relaxation of a typical Dy^III single-ion origin but also the relaxation process caused by the magnetic dipole–magnetic dipole interactions between the neighbouring Dy^III centers.