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Wang, Hai‐Ying; Ge, Jing‐Yuan; Hua, Carol; Jiao, Cheng‐Qi; Wu, Yue; Leong, Chanel F.; D'Alessandro, Deanna M.; Liu, Tao; Zuo, Jing‐Lin
Angewandte Chemie International Edition, May 8, 2017, Volume: 56, Issue: 20Journal Article
A major challenge is the development of multifunctional metal–organic frameworks (MOFs), wherein magnetic and electronic functionality can be controlled simultaneously. Herein, we rationally construct two 3D MOFs by introducing the redox active ligand tetra(4‐pyridyl)tetrathiafulvalene (TTF(py)4) and spin‐crossover FeII centers. The materials exhibit redox activity, in addition to thermally and photo‐induced spin crossover (SCO). A crystal‐to‐crystal transformation induced by I2 doping has also been observed and the resulting intercalated structure determined. The conductivity could be significantly enhanced (up to 3 orders of magnitude) by modulating the electronic state of the framework via oxidative doping; SCO behavior was also modified and the photo‐magnetic behavior was switched off. This work provides a new strategy to tune the spin state and conductivity of framework materials through guest‐induced redox‐state switching. A 3D FeII metal–organic framework (MOF) based on the tetrathiafulvalene tetrapyridyl ligand and its I2‐doped analogue were prepared. The TTF moieties provide redox activity, and I2 doping improves the conductive properties. Doping or light irradiation significantly alters the magnetic properties, indicating the material has electronically and photo‐switchable spin‐crossover properties.
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