Release Time:2019-03-12  Hits:

Indexed by: Journal Article

Date of Publication: 2017-05-08

Journal: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Included Journals: PubMed、EI、SCIE

Volume: 56

Issue: 20

Page Number: 5465-5470

ISSN: 1433-7851

Key Words: iodine; iron; metal-organic frameworks; spin crossover; tetrathiafulvalenes

Abstract: 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 I-2 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 photomagnetic 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.