Discrete Open-Shell Tris(bipyridinium radical cationic) Inclusion Complexes in the Solid State
Abstract
In the solid state the properties of organic radicals depend heavily on radical-radical interactions that are influenced by the superstructure of the crystalline phase. Here, we report the synthesis and characterization of a substituted tetracationic cyclophane, cyclobis(paraquat-p-1,4- dimethoxyphenylene), and outline how its bisradical dicationic redox state associates with the methyl viologen radical cation (MV•+) to give a trisradical tricationic inclusion complex. The (super)structures of the reduced cyclophane and this 1:1 complex in the solid-state deviate from the analogous (super)structures observed for the reduced state of cyclobis(paraquat-p-phenylene) and that of its trisradical tricationic complex. Titration experiments with a range of guests reveal that the methoxy substituents on the para-xylenyl do not influence significantly of the binding affinity of the cyclophane for small neutral guests, whereas the affinity decreases by an order of magnitude for larger radical cationic guests such as MV•+. X-Ray diffraction reveals that the solid- state structures of the tricationic trisradical complexes to be a discrete entity with weak intermolecular orbital overlap between the neighboring complexes. Transient nutation EPR experiment and DFT calculations confirm that the complex has a doublet spin configuration in the ground state as a result of the strong orbital overlap within the complex, while themore »
- Authors:
-
- Northwestern Univ., Evanston, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Univ. of Reading (United Kingdom)
- Northwestern Univ., Evanston, IL (United States); Univ. of New South Wales, Sydney, NSW (Australia)
- Publication Date:
- Research Org.:
- Northwestern Univ., Evanston, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1798263
- Grant/Contract Number:
- SC0004752
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 143; Journal Issue: 1; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Crystals; Superstructures; Counterions; Electron paramagnetic resonance spectroscopy; Quantum mechanics
Citation Formats
Anamimoghadam, Ommid, Jones, Leighton O., Cooper, James A., Beldjoudi, Yassine, Nguyen, Minh T., Liu, Wenqi, Krzyaniak, Matthew D., Pezzato, Cristian, Stern, Charlotte L., Patel, Hasmukh A., Wasielewski, Michael R., Schatz, George C., and Stoddart, J. Fraser. Discrete Open-Shell Tris(bipyridinium radical cationic) Inclusion Complexes in the Solid State. United States: N. p., 2020.
Web. doi:10.1021/jacs.0c07148.
Anamimoghadam, Ommid, Jones, Leighton O., Cooper, James A., Beldjoudi, Yassine, Nguyen, Minh T., Liu, Wenqi, Krzyaniak, Matthew D., Pezzato, Cristian, Stern, Charlotte L., Patel, Hasmukh A., Wasielewski, Michael R., Schatz, George C., & Stoddart, J. Fraser. Discrete Open-Shell Tris(bipyridinium radical cationic) Inclusion Complexes in the Solid State. United States. https://doi.org/10.1021/jacs.0c07148
Anamimoghadam, Ommid, Jones, Leighton O., Cooper, James A., Beldjoudi, Yassine, Nguyen, Minh T., Liu, Wenqi, Krzyaniak, Matthew D., Pezzato, Cristian, Stern, Charlotte L., Patel, Hasmukh A., Wasielewski, Michael R., Schatz, George C., and Stoddart, J. Fraser. Mon .
"Discrete Open-Shell Tris(bipyridinium radical cationic) Inclusion Complexes in the Solid State". United States. https://doi.org/10.1021/jacs.0c07148. https://www.osti.gov/servlets/purl/1798263.
@article{osti_1798263,
title = {Discrete Open-Shell Tris(bipyridinium radical cationic) Inclusion Complexes in the Solid State},
author = {Anamimoghadam, Ommid and Jones, Leighton O. and Cooper, James A. and Beldjoudi, Yassine and Nguyen, Minh T. and Liu, Wenqi and Krzyaniak, Matthew D. and Pezzato, Cristian and Stern, Charlotte L. and Patel, Hasmukh A. and Wasielewski, Michael R. and Schatz, George C. and Stoddart, J. Fraser},
abstractNote = {In the solid state the properties of organic radicals depend heavily on radical-radical interactions that are influenced by the superstructure of the crystalline phase. Here, we report the synthesis and characterization of a substituted tetracationic cyclophane, cyclobis(paraquat-p-1,4- dimethoxyphenylene), and outline how its bisradical dicationic redox state associates with the methyl viologen radical cation (MV•+) to give a trisradical tricationic inclusion complex. The (super)structures of the reduced cyclophane and this 1:1 complex in the solid-state deviate from the analogous (super)structures observed for the reduced state of cyclobis(paraquat-p-phenylene) and that of its trisradical tricationic complex. Titration experiments with a range of guests reveal that the methoxy substituents on the para-xylenyl do not influence significantly of the binding affinity of the cyclophane for small neutral guests, whereas the affinity decreases by an order of magnitude for larger radical cationic guests such as MV•+. X-Ray diffraction reveals that the solid- state structures of the tricationic trisradical complexes to be a discrete entity with weak intermolecular orbital overlap between the neighboring complexes. Transient nutation EPR experiment and DFT calculations confirm that the complex has a doublet spin configuration in the ground state as a result of the strong orbital overlap within the complex, while the quartet-state spin configuration is higher in energy and so is inaccessible at ambient temperature. The superconducting quantum interference device (SQUID) measurement reveals that trisradical tricationic complexes interact antiferromagnetically (J/k = - 2.33 K) and form a 1D Heisenberg antiferromagnetic chain along the a-axis in the crystal. Furthermore, these results offer new insights into the design and synthesis of organic magnetic materials based on host-guest inclusion complexes.},
doi = {10.1021/jacs.0c07148},
journal = {Journal of the American Chemical Society},
number = 1,
volume = 143,
place = {United States},
year = {Mon Dec 21 00:00:00 EST 2020},
month = {Mon Dec 21 00:00:00 EST 2020}
}
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