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Volume 29
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Article

Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals

by
Dongdong Wei
1,
Yongliang Qin
2,
Zhipeng Xu
1,
Hui Liu
1,
Ranran Chen
1,
Yang Yu
3 and
Di Wang
1,*
1
School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230601, China
2
Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
3
School of Advanced Manufacturing Engineering, Hefei University, Hefei 230601, China
*
Author to whom correspondence should be addressed.
Molecules 2024, 29(9), 2042; https://doi.org/10.3390/molecules29092042
Submission received: 25 March 2024 / Revised: 24 April 2024 / Accepted: 27 April 2024 / Published: 28 April 2024
(This article belongs to the Special Issue Hydrogen Bond and Intramolecular Force)
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Abstract

In this work, in order to investigate the short-range interactions between molecules, the spin-magnetic unit nitronyl nitroxide (NN) was introduced to synthesize self-assembly single radical molecules with hydrogen bond donors and acceptors. The structures and magnetic properties were extensively investigated and characterized by UV-Vis absorption spectroscopy, electron paramagnetic resonance (EPR), and superconducting quantum interference devices (SQUIDs). Interestingly, it was observed that the single molecules can form two different dimers (ring-closed dimer and “L”-type dimer) in different solvents, due to hydrogen bonding, when using EPR to track the molecular spin interactions. Both dimers exhibit ferromagnetic properties (for ring-closed dimer, J/kB = 0.18 K and ΔES−T = 0.0071 kcal/mol; for “L”-type dimer, the values were J/kB = 9.26 K and ΔES−T = 0.037 kcal/mol). In addition, the morphologies of the fibers formed by the two dimers were characterized by transmission electron microscopy (TEM) and atomic force microscopy (AFM).
Keywords: dimer; nitronyl nitroxide (NN); spin coupling; magnetism dimer; nitronyl nitroxide (NN); spin coupling; magnetism
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MDPI and ACS Style

Wei, D.; Qin, Y.; Xu, Z.; Liu, H.; Chen, R.; Yu, Y.; Wang, D. Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals. Molecules 2024, 29, 2042. https://doi.org/10.3390/molecules29092042

AMA Style

Wei D, Qin Y, Xu Z, Liu H, Chen R, Yu Y, Wang D. Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals. Molecules. 2024; 29(9):2042. https://doi.org/10.3390/molecules29092042

Chicago/Turabian Style

Wei, Dongdong, Yongliang Qin, Zhipeng Xu, Hui Liu, Ranran Chen, Yang Yu, and Di Wang. 2024. "Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals" Molecules 29, no. 9: 2042. https://doi.org/10.3390/molecules29092042

APA Style

Wei, D., Qin, Y., Xu, Z., Liu, H., Chen, R., Yu, Y., & Wang, D. (2024). Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals. Molecules, 29(9), 2042. https://doi.org/10.3390/molecules29092042

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