In this work, we describe an example of “interpenetration isomerism” in three-dimensional (3D) hydrogen-bonded organic frameworks (HOFs). By exploiting the crystallization conditions for a peripherally extended triptycene H6PET, we can modulate the interpenetration of the assembled frameworks, yielding a two-fold interpenetrated structure PETHOF-1 (acs-2c topology) and a five-fold interpenetrated structure PETHOF-2 (acs-5c topology) as “interpenetration isomers”. In PETHOF-1, two individual nets are related by inversion symmetry and form an interwoven topology with a strikingly large guest-accessible volume of about 80%. In PETHOF-2, five individual nets are related by translational symmetry and are stacked in an alternating fashion. Additionally, the activated materials show permanent porosity with high Brunauer–Emmett–Teller (BET) areas exceeding 1100 m2•g-1. Finally, we believe that synthetic control over the framework interpenetration can serve as a new design strategy to construct diverse and complex supramolecular architectures from simple organic building blocks.
Li, Penghao, Li, Peng, Ryder, Matthew R., et al., "“Interpenetration Isomerism” of Triptycene-Based Hydrogen-Bonded Organic Frameworks," Angewandte Chemie (International Edition) 58, no. 6 (2018), https://doi.org/10.1002/anie.201811263
@article{osti_1488530,
author = {Li, Penghao and Li, Peng and Ryder, Matthew R. and Liu, Zhichang and Stern, Charlotte L. and Farha, Omar K. and Stoddart, Fraser},
title = {“Interpenetration Isomerism” of Triptycene-Based Hydrogen-Bonded Organic Frameworks},
annote = {In this work, we describe an example of “interpenetration isomerism” in three-dimensional (3D) hydrogen-bonded organic frameworks (HOFs). By exploiting the crystallization conditions for a peripherally extended triptycene H6PET, we can modulate the interpenetration of the assembled frameworks, yielding a two-fold interpenetrated structure PETHOF-1 (acs-2c topology) and a five-fold interpenetrated structure PETHOF-2 (acs-5c topology) as “interpenetration isomers”. In PETHOF-1, two individual nets are related by inversion symmetry and form an interwoven topology with a strikingly large guest-accessible volume of about 80%. In PETHOF-2, five individual nets are related by translational symmetry and are stacked in an alternating fashion. Additionally, the activated materials show permanent porosity with high Brunauer–Emmett–Teller (BET) areas exceeding 1100 m2•g-1. Finally, we believe that synthetic control over the framework interpenetration can serve as a new design strategy to construct diverse and complex supramolecular architectures from simple organic building blocks.},
doi = {10.1002/anie.201811263},
url = {https://www.osti.gov/biblio/1488530},
journal = {Angewandte Chemie (International Edition)},
issn = {ISSN 1433-7851},
number = {6},
volume = {58},
place = {United States},
publisher = {Wiley},
year = {2018},
month = {12}}