UV-Vis-NIR response in a photochromic diarylethene-based spin crossover framework with heterogeneous FeII -AgI nodes

Abstract

Spin crossover (SCO) compounds are versatile platforms for incorporating functional ligands, enabling profuse magnetic regulating strategies and providing new candidates for practical applications. Among the copious choices for stimuliresponsive ligands, diarylethene stands out as a photochromic unit that can be integrated into magnetic materials. Here we) with heterometallic nodes. Distinct from conventional SCO frameworks that Fe II centers are directly bridged by organic ligands, coordination fashion in 1 can be manifested as Fe II -L o -Ag I -L o -Fe II . Photochromism was partially realized by alternation of 365 nm and 520 nm irradiation due to tightly packed lattice. Subtle magnetic switching is found from 1 to 1 UV , and 1 UV displays photothermal response up to 162 °C under 808 nm. This thermal-stable three-dimensional framework lights up new structural possibilities for SCO polymers and takes a step forward in the assembling of UV-Vis-NIR responsive magnetic materials.