Reversible coordination-induced spin state switching in a nickel(ii) complex via a crystal-to-crystal transformation

The recent upsurge in coordination-induced spin state switching (CISSS) reflects its application in the areas of switchable contrast agents for magnetic resonance imaging (MRI) and molecular spintronics. Here, an unprecedented CISSS behavior driven by a solvent desorption-triggered single-crystal-to-single-crystal (SCSC) deligation process is found in a dinuclear nickel(ii) complex, [Ni-2(hbth)(py)(6)]center dot 2MeOH (1 center dot py center dot MeOH), which is evidenced by the thermal stability, crystal structures, thermochromism and magnetic properties. Further experiment of vapor diffusion leads to the reversible crystal transformation accompanied with optical (spectral) and magnetic responses in cycles, which provides a new strategy for developing external-stimuli CISSS materials.

Automated summary

The recent upsurge in coordination-induced spin state switching (CISSS) is being applied in the areas of switchable contrast agents for magnetic resonance imaging (MRI) and molecular spintronics. In this study, a novel CISSS behavior driven by solvent desorption-triggered single-crystal-to-single-crystal (SCSC) deligation process is found in a dinuclear nickel(ii) complex. The thermal stability, crystal structures, thermochromism, and magnetic properties provide evidence for this behavior. Additionally, the reversible crystal transformation accompanied by optical and magnetic responses in cycles suggests a new strategy for developing external-stimuli CISSS materials.