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- Title
Study of Molecular Dimer Morphology Based on Organic Spin Centers: Nitronyl Nitroxide Radicals.
- Authors
Wei, Dongdong; Qin, Yongliang; Xu, Zhipeng; Liu, Hui; Chen, Ranran; Yu, Yang; Wang, Di
- 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).
- Subjects
NITROXIDES; SUPERCONDUCTING quantum interference devices; ORGANIC bases; ELECTRON paramagnetic resonance; SINGLE molecules; MAGNETIC structure
- Publication
Molecules, 2024, Vol 29, Issue 9, p2042
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules29092042