Building responsive materials by assembling {Fe4Co4} switchable molecular cubes

Qui Pham Xuan

doi:10.1039/d1tc01825f

Building responsive materials by assembling {Fe4Co4} switchable molecular cubes

2021-01-01

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Rodrigue Lescouëzec *

DOI：10.1039/d1tc01825f

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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 {Fe4Co4} 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.

Keywords:

PRUSSIAN BLUE ANALOGS

METAL-ORGANIC FRAMEWORK

ELECTRON-TRANSFER

SPIN-TRANSITION

MAGNETIC-PROPERTIES

LOCAL-STRUCTURE

SQUARE COMPLEX

TEMPERATURE

STATE

IONS

Building responsive materials by assembling {Fe4Co4} switchable molecular cubes

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