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<p>A new, soft porous crystal of general formula <b>TMPPM(PF</b><sub><b>6</b></sub><b>)</b><sub><b>4</b></sub> has been assembled by combining the rigid tetrahedral tecton tetra-4-(4-methyl-pyridinium)phenylmethane (<b>TMPPM</b><sup><b>4+</b></sup>) as cationic organic linker and hexafluorophosphate PF<sub>6</sub><sup>−</sup> as anionic node. By dissolving the solid compound in acetone, the solvated form <b>TMPPM(PF</b><sub><b>6</b></sub><b>)</b><sub><b>4</b></sub>⋅<b>0.67(Acetone)</b> is obtained, whose open-pore structure (<Emphasis Type="BoldItalic">op</Emphasis>-<b>TMPPM(PF</b><sub><b>6</b></sub><b>)</b><sub><b>4</b></sub>) contains one-dimensional channels of octagonal cross-section where the disorder solvent is accommodated. By heating the crystals, the solvent is released in a single-crystal-to-single-crystal transformation that leads to a closed-pore phase (<Emphasis Type="BoldItalic">cp</Emphasis>-<b>TMPPM(PF</b><sub><b>6</b></sub><b>)</b><sub><b>4</b></sub>) comprising unconnected voids. The reversible, dynamic adsorption-desorption process was followed by <i>ex situ</i> and <i>in situ</i> PXRD analyses, respectively. Moreover, the release of acetone over time was shown to be in good agreement with the guest-packing efficiency rule.</p>

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Dynamic behaviour of a soft porous crystal based on a tetra-4-(4-methyl-pyridinium) phenylmethane salt

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  • 发表日期：

    2026年1月24日

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  • Danilo Marchetti,
  • Riccardo Testa,
  • Roberta Pinalli,
  • Alessandro Pedrini,
  • Chiara Massera

摘要

A new, soft porous crystal of general formula TMPPM(PF6)4 has been assembled by combining the rigid tetrahedral tecton tetra-4-(4-methyl-pyridinium)phenylmethane (TMPPM4+) as cationic organic linker and hexafluorophosphate PF6− as anionic node. By dissolving the solid compound in acetone, the solvated form TMPPM(PF6)4⋅0.67(Acetone) is obtained, whose open-pore structure (op-TMPPM(PF6)4) contains one-dimensional channels of octagonal cross-section where the disorder solvent is accommodated. By heating the crystals, the solvent is released in a single-crystal-to-single-crystal transformation that leads to a closed-pore phase (cp-TMPPM(PF6)4) comprising unconnected voids. The reversible, dynamic adsorption-desorption process was followed by ex situ and in situ PXRD analyses, respectively. Moreover, the release of acetone over time was shown to be in good agreement with the guest-packing efficiency rule.