π-electron weak ferromagnetism in potassium-intercalated 9-phenylanthracene

Fu, Ming-An; Wang, Ren‐Shu; Yang, Hui; Zhang, Pei-Yuan; Zhang, Chunfang; Chen, Xiao‐Jia; Gao, Yun; Huang, Zhongbing

doi:10.1016/j.carbon.2020.11.064

Cited by 10 publications

(4 citation statements)

References 80 publications

(55 reference statements)

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“…Such magnetic phase transitions at low temperatures were also observed for other similar radicals in the solid state. For example, antiferromagnetic ordering at 28.6 K was reported for potassium naphthalenide and, more recently, ferromagnetic ordering at 5.2 K was revealed for potassium 9-phenylanthracene …”

Section: Resultsmentioning

confidence: 96%

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Tuning Magnetic Interactions Between Triphenylene Radicals by Variation of Crystal Packing in Structures with Alkali Metal Counterions

et al. 2021

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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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Section: Resultsmentioning

confidence: 96%

“…For example, antiferromagnetic ordering at 28.6 K was reported for potassium naphthalenide 66 and, more recently, ferromagnetic ordering at 5.2 K was revealed for potassium 9phenylanthracene. 67…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tuning Magnetic Interactions Between Triphenylene Radicals by Variation of Crystal Packing in Structures with Alkali Metal Counterions

et al. 2021

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“…For example, superconductivity in potassium doped picene [8], phenanthrene [9], phenacene [10], dibenzopentacene [11], coronene [12], p-oligophenyls [13][14][15][16], 2,2 -bipyridine [17], and triphenylbismuth [18][19][20] have been successfully exploited with the highest superconducting transition temperature (Tc) record of 123 K, exceeding the 38 K of Cs 3 C 60 [6]. Furthermore, some other properties have also been discovered in PAHs with metal insertion [21][22][23][24][25][26]. Potassium-doped 9-phenylanthracene (K 3 C 20 H 14 ) exhibited ferromagnetism in the low temperature zone [21].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, some other properties have also been discovered in PAHs with metal insertion [21][22][23][24][25][26]. Potassium-doped 9-phenylanthracene (K 3 C 20 H 14 ) exhibited ferromagnetism in the low temperature zone [21]. Caesium-doped phenanthrene (Cs 1 C 14 H 10 ) is a Heisenberg antiferromagnet [22].…”

Section: Introductionmentioning

confidence: 99%

Structural and Magnetic Properties of Potassium-Doped 2,3-DiMethylnaphthalene

Wang

Yang

et al. 2021

Crystals

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The development of potential magnetic materials in metal-doped polycyclic aromatic hydrocarbons has been a research hotspot in recent years. Here we have successfully synthesized stable potassium-doped 2,3-dimethylnaphthalene samples. The combination of first-principles calculations and XRD results identifies that doping of potassium into 2,3-dimethylnaphthalene forms a monoclinic structure with a molar ratio of 1:2 between potassium and molecule. The red shifts in the Raman spectra indicate that potassium 4s electrons are transferred to the organic molecules. The magnetic measurements show that the doped materials exhibit a temperature-independent magnetization in the temperature region of 1.8–300 K, which is consistent with the Pauli paramagnetic behavior. This is distinct from the diamagnetism of pristine material. Compared to the previous focus on benzene ring structure, our study of aromatic hydrocarbon derivatives of benzene ring opens a new route for the development of this field.

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Recent Progress of Organic Semiconductor Materials in Spintronics

Zhu

Jiang

Zhang

et al. 2023

Chemistry An Asian Journal

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Spintronics, a new discipline focusing on the spindependent transport process of electrons, has been developing rapidly. Spin valves are the most significant carriers of spintronics utilizing the spin freedom of electrons. It is expected to pierce "Moore's Law" and become the core component in processors of the next generation. Organic semiconductors advance in their adjustable band gap, weak spin-orbit coupling and hyperfine interaction, excellent filmforming property, having enormous promise for spin valves.Here, the principle of spin valves is introduced, and the history and progress in organic spin injection and transport materials are summarized. Then we analyze the influence of spinterface on device performance and introduce reliable methods of constructing organic spin valves. Finally, the challenges for spin valves are discussed, and the future is proposed. We aim to draw the attention of researchers to organic spin valves and promote further research in spintronics through this paper.

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π-electron weak ferromagnetism in potassium-intercalated 9-phenylanthracene

Cited by 10 publications

References 80 publications

Tuning Magnetic Interactions Between Triphenylene Radicals by Variation of Crystal Packing in Structures with Alkali Metal Counterions

Tuning Magnetic Interactions Between Triphenylene Radicals by Variation of Crystal Packing in Structures with Alkali Metal Counterions

Structural and Magnetic Properties of Potassium-Doped 2,3-DiMethylnaphthalene

Recent Progress of Organic Semiconductor Materials in Spintronics

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