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郑州大学杜景祯教授等重磅Nature Chemistry!!双铀与双钍反三明治型配合物中环‑Bi₃³⁻的全金属芳香性

  • 2026-05-14 19:57:44
郑州大学杜景祯教授等重磅Nature Chemistry!!双铀与双钍反三明治型配合物中环‑Bi₃³⁻的全金属芳香性

材料研究前沿——聚焦材料科学研究前沿进展。100多万材料领域硕博教师们订阅的微信大号。点击标题下蓝字“材料研究前沿”关注,我们将为您提供有价值、最前沿的材料研究资讯。

芳香性是化学领域的核心基础概念,尤其在有机化学中占据关键地位,其本质是环状平面不饱和分子因电子离域而获得额外稳定性,经典休克尔规则提出具有 4n+2 个离域 π 电子的体系具备芳香性。随着研究推进,芳香性概念被拓展到全金属体系,相关研究成为热点,但也伴随诸多争议。一方面,芳香性的定义尚未完全统一;另一方面,休克尔模型是否适用于重元素体系,仍缺乏充分实验与理论支撑。环状三铋单元 cyclo‑Bi₃是环丙烯基阳离子 / 阴离子的最重 6p 类似物,其芳香性研究具有重要理论价值。但铋原子易形成大尺寸簇合物,离散环‑Bi₃单元的合成与稳定难度极高,该单元的电子结构、芳香性类型,始终是化学界未解决的关键问题,也成为探索有机与无机芳香性差异的重要研究对象。

在这项研究中,研究人员联合多所高校团队,成功合成双铀和双钍 6π‑环‑Bi₃³⁻反三明治型配合物,完善了开链与环状 Biₙ(n=3–5)化合物的研究体系。实验检测发现,6π‑环‑Bi₃³⁻呈现出显著的环电流,强度与苯、环丙烯基阳离子、环丙烯基阴离子等经典芳香体系相近。理论计算结果显示,6π‑环‑Bi₃³⁻、2π‑环‑Bi₃⁺与 0π‑环‑Bi₃³⁺的环电流数值相近,证明环‑Bi₃³⁻中 σ‑芳香性占主导地位,贡献远超 π‑芳香性,即便用定域键模型描述该结构更简便。该成果明确了环‑Bi₃³⁻的全金属芳香性特征,为有机与无机芳香性的对比研究搭建了重要平台。

本研究通过精准的合成策略,在双铀、双钍反三明治型配合物中,成功分离并表征出高对称性的环‑Bi₃³⁻单元,为其芳香性研究提供了可靠实验基础。结合实验测试与理论计算,证实 6π 电子的环‑Bi₃³⁻具有显著全金属芳香性,其磁诱导环电流强度高于同族环‑Bi₄⁴⁺、环‑Bi₅⁻,且超过苯、环丙烯基离子等经典有机芳香分子,双钍配合物的增强抗磁性也为芳香性提供了宏观磁学证据。研究还发现,环‑Bi₃³⁻以 σ‑芳香性为主导,与传统 π 电子驱动的有机芳香体系存在本质区别。该成果确立了环‑Bi₃³⁻作为最重全金属 6p 芳香类似物的地位,为解析重主族元素化学键本质、构建有机与无机芳香性统一评价标准提供了核心基准数据。

评审过300+份本子后,我揭秘锂电正极立项依据的“必杀技”:拒绝罗列,死磕机制!

工材口国自然基金面上项目青年项目申报书参考范文

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基于缺陷工程的多元杂原子掺杂硬碳微观结构优化及储钠性能研究 

基于共轭与杂化策略调控共价有机框架电子离域结构提升锂离子迁移动力学机制研究

基于新型功能单体的凝胶聚合物电解质设计及其钠离子电池界面优化研究 

面向快充锂金属电池的梯度结构石榴石电解质 设计及其界面应力自适应机制研究

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  1. CONNECT:[ UseTime:0.000561s ] mysql:host=127.0.0.1;port=3306;dbname=i460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000778s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000331s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000248s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000494s ]
  6. SELECT * FROM `set` [ RunTime:0.000234s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000545s ]
  8. SELECT * FROM `article` WHERE `id` = 526006 LIMIT 1 [ RunTime:0.000586s ]
  9. UPDATE `article` SET `lasttime` = 1778968330 WHERE `id` = 526006 [ RunTime:0.011823s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000312s ]
  11. SELECT * FROM `article` WHERE `id` < 526006 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 526006 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004031s ]
  13. SELECT * FROM `article` WHERE `id` < 526006 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001996s ]
  14. SELECT * FROM `article` WHERE `id` < 526006 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001162s ]
  15. SELECT * FROM `article` WHERE `id` < 526006 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001441s ]
0.097094s