Magnetoelectricity-Mediated Tunable Absorption and Release of Peroxide Dianions.

Peroxide dianion (O) has strong oxidizing activity and ease of proton abstraction and is extremely unstable. Direct and controllable adsorption and release of O has large application implication and is a large challenge so far. Here, we use a unique metal (Ni)-organic (diphenylalanine, DPA) framework (MOF), Ni(DPA), as adsorbents for absorption and release of O. This MOF structure has room-temperature magnetoelectricity via distortion of the Ni-centered octahedron {NiNO} and thus possesses a tunable ferroelectric polarization under applied electric/magnetic fields. Controllable adsorption and release of O are realized in such a MOF system via electrochemical redox measurements. Structural/spectroscopic characterization and calculations reveal that a number of NH active sites in the nanopores of MOF can effectively adsorb O by hydrogen bonds and then tunable ferroelectric polarization induces controllable release of O under applied magnetic fields. This work presents a constructive way for controllable adsorption and release of reactive oxygen species.