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分子轨道示意图

六重键(英語:Sextuple Bond),是指化學中,由6對價電子組成的共价键

六重键的键级為6,含有六重鍵的化合物仅有双原子分子,而它们仅在非常低的温度下存在于气相

尽管双原子的也有名义上的6對價電子組成的键,但根据量子化学的计算,它们的有效键级小于5,可能是五重键[1]

有很强的证据显示,元素周期表中任何两个元素之间不可能形成键级超过六的化学键[2]

气相中的的观测必须在很低的温度(7K),使用激光蒸发技术,用近红外光谱紫外光谱进行观测。[3]

科學界期望可以於發現到與觀察結果類似的一對双自由基[4]

更高的键级将会反映在更短的键长上,仅有1.94 Å[來源請求]

拓展連結编辑

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  • 價電子

参考文献编辑

  1. ^ Roos, Björn O.; Borin, Antonio C.; Gagliardi, Laura. Reaching the Maximum Multiplicity of the Covalent Chemical Bond. Angewandte Chemie. 2007-02-19, 119 (9): 1491–1494. ISSN 1521-3757. doi:10.1002/ange.200603600 (英语). 
  2. ^ Roos, Björn O.; Antonio C. Borin, and Laura Gagliardi. Reaching the Maximum Multiplicity of the Covalent Chemical Bond. Angewandte Chemie International Edition. 2007. doi:10.1002/anie.200603600. 
  3. ^ D. Kraus, M. Lorenz and V. E. Bondybey. On the dimers of the VIB group: a new NIR electronic state of Mo2. PhysChemComm. 2001, 4: 44 – 48. doi:10.1039/b104063b. 
  4. ^ Gabriel Merino, Kelling J. Donald, Jason S. D’Acchioli, and Roald Hoffmann. The Many Ways To Have a Quintuple Bond. J. Am. Chem. Soc. 2007, 129 (49): 15295 –15302. doi:10.1021/ja075454b. 

扩展阅读编辑

  • Bruce E. Bursten; F. Albert Cotton; Michael B. Hall. Dimolybdenum: nature of the sextuple bond. Journal of the American Chemical Society. 1980, 102 (20): 6348. doi:10.1021/ja00540a034. 
  • Borin, A; Gobbo, João Paulo; Roos, Björn O. A theoretical study of the binding and electronic spectrum of the Mo2 molecule. Chemical Physics. 2008, 343 (2–3): 210. doi:10.1016/j.chemphys.2007.05.028. 
  • Marvin M. Goodgame; William A. Goddard I I I. The "sextuple" bond of chromium dimer. The Journal of Physical Chemistry. 1981, 85 (3): 215. doi:10.1021/j150603a001. 
  • Chisholm, Mh. Metal to metal multiple bonds in ordered assemblies (Free full text). Proceedings of the National Academy of Sciences of the United States of America. Feb 2007, 104 (8): 2563–70. PMC 1815223. PMID 17299047. doi:10.1073/pnas.0610364104. 
  • Norman, Joe G., Jr.; Ryan, P. Barry. Metal-metal bond energies in diatomic molybdenum, octachloromolybdate (Mo2Cl84-), and molybdenum formate (Mo2(O2CH)4). Journal of Computational Chemistry. 1980, 1 (1): 59–63. doi:10.1002/jcc.540010107. 
  • Atha, P. M.; Hillier, I. H.; Guest, M. F. Electron correlation and the nature of the sextuple bond in the dimolybdenum molecule. Chemical Physics Letters. 1980, 75 (1): 84–86. doi:10.1016/0009-2614(80)80469-6. 
  • Wood, Carol; Doran, Mark; Hillier, Ian H.; Guest, Martyn F. Theoretical study of the electronic structure of the transition metal dimers, discandium, dichromium, dimolybdenum, and dinickel. Faraday Symp. R. Soc. Chem. 1980, 14 (Diatomic Met. Met. Clusters): 159–169. doi:10.1039/fs9801400159.