A Triply Negatively Charged Nanographene Bilayer with Spin Frustration
A Triply Negatively Charged Nanographene Bilayer with Spin Frustration
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具有自旋受阻的三重负电荷纳米石墨烯双层
DOI：
10.1002/anie.202217788
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Xinping Wang
中科院分区：
文献类型：
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作者：
Wenqing Wang;Xiao-Hui Ma;Min Liu;Shuxuan Tang;Xuguang Ding;Yue Zhao;Yuan-Zhi Tan;Miklos Kertesz;Xinping Wang
我们报道了最大的开壳石墨烯双层，也是第一个三重负电荷自由基π-二聚体的例子。在三电子还原过程中，双层纳米碳烯碎片分子(C96H24Ar6)2(Ar=2，6-二甲基苯基)(12)转变为带三个负电荷的物种123.−，用单晶X射线衍射、电子顺磁共振和超导量子干涉仪(SQUID)的磁性质进行了表征.123.−具有96中心-3电子(96c/3e)的双基态，可被热激发到四重态。它由34个π-稠环和96个共轭sp2碳原子组成。在123℃的低温下，用自旋受挫参数f>；31.8观察到了自旋受挫。−表明，石墨烯还原掺杂后可能表现为量子自旋液体。
We report on the largest open‐shell graphenic bilayer and also the first example of triply negatively charged radical π‐dimer. Upon three‐electron reduction, bilayer nanographene fragment molecule (C96H24Ar6)2(Ar=2,6‐dimethylphenyl) (12) was transformed to a triply negatively charged species123.−, which has been characterized by single‐crystal X‐ray diffraction, electron paramagnetic resonance (EPR) spectroscopy and magnetic properties on a superconducting quantum interference device (SQUID).123.−features a 96‐center‐3‐electron (96c/3e) pancake bond with a doublet ground state, which can be thermally excited to a quartet state. It consists of 34 π‐fused rings with 96 conjugatedsp2carbon atoms. Spin frustration is observed with the frustration parameterf>31.8 at low temperatures in123.−, which indicates graphene upon reduction doping may behave as a quantum spin liquid.