Building responsive materials by assembling {FeCo} switchable molecular cubes

• Published in: Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2021-07, Vol.9 (28), p.8882-889
• Main Authors: Xuan, Qui Pham, Glatz, Jana, Benchohra, Amina, Jiménez, Juan-Ramón, Plamont, Rémi, Chamoreau, Lise-Marie, Flambard, Alexandrine, Li, Yanling, Lisnard, Laurent, Dambournet, Damien, Borkiewicz, Olaf J, Boillot, Marie-Laure, Catala, Laure, Tissot, Antoine, Lescouëzec, Rodrigue
• Format: Article
• Language: English
• Subjects: Chemical Sciences; Crystallography; Cubes; Electron transfer; Inorganic chemistry; Ligands; Magnetic properties; Material chemistry; NMR; Nuclear magnetic resonance; Room temperature; Switches
• ISSN: 2050-7526; 2050-7534
• DOI: 10.1039/d1tc01825f

Responsive materials that can answer to chemical or physical external stimuli offer numerous prospects in material science. Here, we have elaborated a two-step synthetic approach that allows incorporating molecular cubic switches into a polymeric material. Firstly, a preformed half-capped, Cs + -templated {Fe 4 Co 4 } cyanido-polymetallic cubic unit ("pro-cube") is obtained and proven to be stable in solution, as demonstrated by paramagnetic NMR. Secondly, the reaction of the pro-cube with a ditopic scorpionate ligand enables the precipitation of a polymeric network containing the cubic unit. Furthermore, the adequately chosen ditopic ligand that coordinates the Co ions of the pro-cube allows us to preserve the switchable properties of the cubic unit. Indeed, the magnetic properties of the polymeric material compare well with those of the molecular cubic model that is obtained by reacting a non-bridging scorpionate ligand, and that was prepared as a reference. Both the polymeric material and the molecular model cube show a thermally-induced metal-metal electron transfer near room temperature. Interestingly, the magnetic state of the polymeric material is shown to depend on its hydration state, indicating its capability to act as a chemo-sensor. Molecular {Fe 4 Co 4 } cubic switches can be assembled to form a responsive polymeric material, whose magnetic state allows sensing the intercalation/deintercalation of small solvent molecules.