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Pennachio M, Zhou Z, Wei Z, Tsybizova A, Gershoni-Poranne R, Petrukhina MA. Interplay of Charge and Aromaticity Upon Chemical Reduction of p-Quinquephenyl with Alkali Metals. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Matthew Pennachio
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Zheng Zhou
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
- School of Materials Science and Engineering, Tongji University, 4800 Cao’an Road, Shanghai 201804, China
| | - Zheng Wei
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Alexandra Tsybizova
- Laboratory for Organic Chemistry, ETH Zurich, Vladimir-Prelog-Weg 2, Zurich 8092, Switzerland
| | - Renana Gershoni-Poranne
- Schulich Faculty of Chemistry, Technion − Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Marina A. Petrukhina
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
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Zhou Z, Üngör Ö, Wei Z, Shatruk M, Tsybizova A, Gershoni-Poranne R, Petrukhina MA. Tuning Magnetic Interactions Between Triphenylene Radicals by Variation of Crystal Packing in Structures with Alkali Metal Counterions. Inorg Chem 2021; 60:14844-14853. [PMID: 34524808 DOI: 10.1021/acs.inorgchem.1c02139] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The monoanion of triphenylene (C18H12, 1) was generated in THF using several alkali metals (Na, K, Rb, and Cs) as reducing agents and crystallized with the corresponding cations in the presence of 18-crown-6 ether. The UV-vis spectroscopy points to the metal-dependent coordination environment of the triphenylene monoanion-radicals, 1·-, in solution. The X-ray diffraction characterization confirmed the formation of a solvent-separated ion pair (SSIP) with sodium ions, [{Na+(18-crown-6)(THF)2}(1·-)] (2), and three contact-ion pair (CIP) complexes formed by larger alkali metal ions, [{K+(18-crown-6)}(1·-)] (3), [{Rb+(18-crown-6)}(1·-)] (4), and [{Cs+(18-crown-6)}(1·-)] (5). Structural analysis of the series reveals a notable geometry perturbation of the triphenylene framework in 2 caused by one-electron acquisition, which is further enhanced by direct metal binding in 3-5. This has been correlated with the aromaticity changes and charge redistribution upon one-electron reduction of 1, as revealed by the computational studies. The EPR spectroscopy and magnetic susceptibility measurements confirm antiferromagnetic interactions corresponding to an S = 1/2 system in the solid state. The magnetic behavior of 3-5 correlates with the arrangement of triphenylene radicals in the crystal structures. All three compounds exhibit antiferromagnetic (AFM) interactions between S = 1/2 radicals in the solid state, but the exchange coupling in 4 and 5 is notably stronger than that in 3, which leads to AFM ordering at 3.8 K in 4 and at 2.0 K in 5. The magnetic phase transitions in 4 and 5 can be interpreted as originating from interactions between the chains of the AFM-coupled S = 1/2 radicals.
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Affiliation(s)
- Zheng Zhou
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Ökten Üngör
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | - Zheng Wei
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
| | - Michael Shatruk
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390, United States
| | | | - Renana Gershoni-Poranne
- Laboratorium für Organische Chemie, ETH Zürich, CH-8093 Zürich, Switzerland.,Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa 3200008, Israel
| | - Marina A Petrukhina
- Department of Chemistry, University at Albany, State University of New York, Albany, New York 12222, United States
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