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Start Over Author "Wang, Xinping" Journal angewandte chemie
38 results on '"Wang, Xinping"'

1. A Thermally Populated Germylene‐Based Donor‐Acceptor Diradical.

Author

Zhao, Yu, Zhang, Yuchen, Wang, Tao, Pei, Runbo, Zhao, Yue, Xue, Xiao‐Song, and Wang, Xinping

Abstract

This work reports synthesis of a germylene based donor‐acceptor molecule and its thermal excitation to a triplet state by coordination with a Lewis acid. Products have been characterized by single crystal X‐ray diffraction, EPR spectroscopy, and SQUID measurement, in conjunction with DFT calculation. The singlet‐triplet energy gap of the donor‐acceptor molecule is dramatically reduced from −18.8 to −7.2 kcal/mol by the coordination with B(C6F5)3 (BCF), which enables an intramolecular single electron transfer from one germylene moiety to another upon heating, forming an intramolecular radical ion pair with diradical character. The work provides an approach to the formation of thermally populated open‐shell species of heavier main group elements. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Metal‐Free Catalytic Formation of a Donor‐Acceptor‐Donor Molecule and Its Lewis Acid‐Adduct Singlet Diradical with High‐Efficient NIR‐II Photothermal Conversion

Author

Kong, Shanshan, primary, Yang, Liming, additional, Sun, Quanchun, additional, Wang, Tao, additional, Pei, Runbo, additional, Zhao, Yue, additional, Cui, Haiyan, additional, Gu, Xinggui, additional, Wang, Xinping, additional, Wang, Wenqing, additional, and Zhao, Yu, additional

Published
2024
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5. Spin Frustration in Organic Radicals.

Author

Tang, Shuxuan and Wang, Xinping

Subjects
*RADICALS (Chemistry), *QUANTUM spin liquid, *FRUSTRATION, *POLYCYCLIC aromatic hydrocarbons, *CRYSTAL lattices, *FULLERENE derivatives
Abstract

Spin frustration, which results from geometric frustration and a systematical inability to satisfy all antiferromagnetic (AF) interactions between unpaired spins simultaneously, is under the spotlight for its importance in physics and materials science. Spin frustration is treated as the structural basis of quantum spin liquids (QSLs). Featuring flexible chemical structures, organic radical species exhibit great potential in building spin‐frustrated molecules and lattices. So far, the reported examples of spin‐frustrated organic radical compounds include triradicals, tetrathiafulvalene (TTF) radicals and derivatives, [Pd(dmit)2] compounds (dmit=1,3‐dithiol‐2‐thione‐4,5‐dithiolate), nitronyl nitroxides, fullerenes, polycyclic aromatic hydrocarbons (PAHs), and other heterocyclic compounds where the spin frustration is generated intra‐ or intermolecularly. In this Minireview, we provide a brief summary of the reported radical compounds that possess spin frustration. The related data, including magnetic exchange coupling parameters, spin models, frustration parameters, and crystal lattices, are summarized and discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Lewis Acid‐Mediated Radical Stabilization and Dynamic Covalent Bonding: Tunable, Reversible and Photocontrollable.

Author

Liu, Min, Yang, Xing, Sun, Quanchun, Wang, Tao, Pei, Runbo, Yang, Xingyu, Zhao, Yue, Zhao, Lili, Frenking, Gernot, and Wang, Xinping

Subjects
RADICALS (Chemistry), COVALENT bonds, ELECTRON paramagnetic resonance spectroscopy, LEWIS acids, CHARGE exchange
Abstract

This work describes a strategy not only to isolate a dynamically stable radical with physical property tunability, but to efficiently regulate the radical dissociation with reversibility and photo controllability. The addition of Lewis acid B(C6F5)3 (BCF) into the solution of a radical σ‐dimer (1‐1) led to a stable radical (1⋅‐2B), which has been characterized by EPR spectroscopy, UV/Vis spectroscopy and single crystal X‐ray diffraction, in conjunction with theoretical calculation. The radical species is stabilized mainly by captodative effect, single electron transfer and steric effect. The absorption maximum of the radical can be tuned by using different Lewis acids. Dimer 1‐1 can be achieved back by addition of a stronger base into the solution of 1⋅‐2B, exhibiting a reversible process. By introducing a photo BCF generator, the dissociation of the dimer and the formation of the radical adduct become photocontrollable. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Elusive Antimony-Centered Radical Cations: Isolation, Characterization, Crystal Structures, and Reactivity Studies.

Author

Li, Tao, Wei, Houjia, Fang, Yong, Wang, Lei, Chen, Sheng, Zhang, Zaichao, Zhao, Yue, Tan, Gengwen, and Wang, Xinping

Subjects
STIBINE, ELECTRON paramagnetic resonance spectroscopy, BENZOQUINONES, RADICAL cations, CRYSTAL structure
Abstract

One-electron oxidation of the stibines Aryl3Sb ( 1, Aryl=2,6- iPr2-4-OMe-C6H2; 2, Aryl=2,4,6- iPr3-C6H2) with AgSbF6 and NaBArylF4 (ArylF=3,5-(CF3)2C6H3) afforded the first structurally characterized examples of antimony-centered radical cations 1.+[BArylF4]− and 2.+[BArylF4]−. Their molecular and electronic structures were investigated by single-crystal X-ray diffraction, electron paramagnetic resonance spectroscopy (EPR) and UV/Vis absorption spectroscopy, in conjunction with theoretical calculations. Moreover, their reactivity was investigated. The reaction of 2.+[BArylF4]− and p-benzoquinone afforded a dinuclear antimony dication salt 32+[BArylF4]2−, which was characterized by NMR spectroscopy and X-ray diffraction analysis. The formation of the dication 32+ further confirms that the isolated stibine radical cations are antimony-centered. [ABSTRACT FROM AUTHOR]

Published
2017
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33. Reversible σ-Dimerizations of Persistent Organic Radical Cations.

Author

Chen, Xiaoyu, Wang, Xingyong, Zhou, Zhaoyi, Li, Yizhi, Sui, Yunxia, Ma, Jing, Wang, Xinping, and Power, Philip P.

Abstract

Eine Klasse definierter reversibler σ ‐ Dimerisierungen von 9,10 ‐ Dialkoxyanthracen ‐ Radikalkationen wird vorgestellt. Gelbe Kristalle, die das σ ‐ dimerisierte Dikation enthalten, ergeben violette Lösungen mit monomeren Radikalkationen (siehe Schema). Identität und Stabilität der Radikalkationen wurden bestätigt, wodurch der Nachweis für reversible σ ‐ Dimerisierungen beständiger Radikalkationen von aromatischen Systemen erbracht wurde. [ABSTRACT FROM AUTHOR]

Published
2013
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36. Reply to Comments on 'Synthesis, Characterization, and Structures of Persistent Aniline Radical Cation'.

Author

Chen, Xiaoyu, Wang, Xingyong, Sui, Yunxia, Li, Yizhi, Ma, Jing, Zuo, Jinglin, and Wang, Xinping

Subjects
ANILINE synthesis, RADICAL cations
Abstract

Die Identifizierung des Anilin ‐ Radikalkations TBA.+ (TBA=2,4,6 ‐ tBu3C6H2NH2), über die 2012 berichtet wurde, wird in den beiden vorhergehenden Korrespondenzartikeln angezweifelt. Die Autoren der ursprünglichen Veröffentlichung haben ihre UV/Vis ‐ und EPR ‐ Daten nochmals überprüft und insistieren, dass das TBA.+ ‐ Radikalkation tatsächlich beständig und stabil ist. Die mögliche Kokristallisation von TBA.+ mit TBAH+ bewirkt eine Verkomplizierung der Kristallstruktur. [ABSTRACT FROM AUTHOR]

Published
2014
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