Generation of the organo-rare gas dications HCCRg2+ (Rg = Ar and Kr) in the reaction of acetylene dications with rare gases.

Generation of the organo-rare gas dications HCCRg2+ (Rg = Ar and Kr) in the reaction of acetylene dications with rare gases.
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乙炔双标与稀有气体反应生成有机稀有气体双标 HCCRg2(Rg = Ar 和 Kr)。

DOI:
10.1039/b810398d
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发表时间:
2008
期刊:
PCCP
影响因子:
--
通讯作者:
Ascenzi D
Ascenzi D
中科院分区:
--
文献类型:
--
作者:
Ascenzi D

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以双电离乙炔为超亲电试剂,通过大量选择的C2H22+与中性稀有气体(Rg)的高温碰撞,首次制备了新的稀有气体化合物hcccar2 +和HCCKr2+。然而,从稀有气体到乙炔的电子转移以及从C2H22+到稀有气体的质子转移有效地竞争了HCCRg2+的形成。计算结果表明,乙炔反应生成HCCRg2+在Rg = He, Ne, Ar和Kr条件下是吸热的,在Xe条件下是弱放热的。这些能量因子,以及与其他反应通道的明显竞争,有助于解释为什么HCCRg2+只在Rg = Ar和Kr时被观察到。
Using doubly ionized acetylene as a superelectrophilic reagent, the new rare-gas compounds HCCAr2+ and HCCKr2+ have been prepared for the first time in hyperthermal collisions of mass-selected C2H22+ with neutral rare gases (Rg). However, electron transfer from the rare gas to the acetylene dication as well as proton transfer from C2H22+ to the rare gas efficiently compete with formation of HCCRg2+. The computational investigations show that the formation of HCCRg2+ from acetylene dication is endothermic with Rg = He, Ne, Ar and Kr and only weakly exothermic with Xe. These energetic factors, as well as the pronounced competition with the other reactive channels help to explain why HCCRg2+ is only observed with Rg = Ar and Kr.
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