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sextuple bond : ウィキペディア英語版
sextuple bond

A sextuple bond is a type of covalent bond involving 12 bonding electrons and in which the bond order is 6. The only known molecules with true sextuple bonds are the diatomic dimolybdenum (Mo2) and ditungsten (W2), which exist in the gaseous phase and have boiling points of and . There is strong evidence to believe that no two elements in the periodic table with atomic number below about 100 can form a bond with greater order than 6.〔
==Dimolybdenum and ditungsten==
Dimolybdenum (Mo2) can be observed in the gas phase at low temperatures (7 K) by a laser evaporation technique using molybdenum sheet with, for instance, near infrared spectroscopy or UV spectroscopy. Like dichromium, a singlet state is expected from dimolybdenum. Higher bond order is reflected in shorter bond length of 194 pm.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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