Stepwise Observation of Iodine Diffusion in a Flexible Coordination Network Having Dual Interactive Sites

Abstract

We created dual interactive sites in a porous coordination network using a CuI cluster and a rotation-restricted ligand, tetra­(3-pyridyl)­phenylmethane (3-TPPM). The dual interactive sites of iodide and Cu ions can adsorb I2 via four-step processes including two chemisorption processes. Initially, one I2 molecule was physisorbed in a pore and successively chemisorbed on iodide sites of the pore surface, and then the next I2 molecule was physisorbed and chemisorbed on Cu ions to form a cross-linked network. We revealed the four-step I2 diffusion process by single-crystal X-ray structure determination and spectroscopic kinetic analysis.

Cluster‐Based Crystalline Materials for Iodine Capture

“…Kawano and co-authors created the dual interaction sites by Cu 2 I 2 cluster and a rotation-restricted ligand in 2021. [28] The double site of the Cu 2 I 2 cluster can adsorb I 2 via four steps. First, one I 2 molecule enters the pores through physical adsorption and will subsequently be fixed on the iodide ion site on the pore surface via chemisorption.…”

“…JLU‐Liu14 exhibits reversible adsorption and desorption in an ethanol solution, and the amount of adsorption is related to the pore size of crystals and the interaction of host and guest. Kawano and co‐authors created the dual interaction sites by Cu 2 I 2 cluster and a rotation‐restricted ligand in 2021 [28] . The double site of the Cu 2 I 2 cluster can adsorb I 2 via four steps.…”