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Formation of organoxenon dications in the reactions of xenon with dications derived from toluene

机译:在氙气与甲苯衍生的反应中形成有机氙气

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The bimolecular reactivity of xenon with C_7H_n~(2+) dications (n=6-8), generated by double ionization of toluene using both electrons and synchrotron radiation, is studied by means of a triple-quadrupole mass spectrometer. Under these experimental conditions, the formation of the organoxenon dications C_7H_6Xe~(2+) and C_7H__7Xe~(2+) is observed to occur by termolecular collisional stabilization. Detailed experimental and theoretical studies show that the formation of C_7H_6Xe ~(2+)+H_2 from doubly ionized toluene (C_7H _8~(2+)) and xenon occurs as a slightly endothermic, direct substitution of dihydrogen by the rare gas with an expansion to a seven-membered ring structure as the crucial step. For the most stable isomer of C _7H_6Xe~(2+), an adduct between the cycloheptatrienyldiene dication and xenon, the computed binding energy of 1.36 eV reaches the strength of (weak) covalent bonds. Accordingly, electrophiles derived from carbenes might be particularly promising candidates in the search for new rare-gas compounds.
机译:利用三重四极杆质谱仪研究了甲苯通过电子和同步加速器辐射的双重电离产生的氙与C_7H_n〜(2+)离子(n = 6-8)的双分子反应性。在这些实验条件下,通过分子间碰撞稳定作用观察到有机氙指示C_7H_6Xe〜(2+)和C_7H__7Xe〜(2+)的形成。详细的实验和理论研究表明,由双离子化甲苯(C_7H _8〜(2+))和氙形成C_7H_6Xe〜(2 +)+ H_2是氙的一种轻微吸热,直接取代的氢气,其膨胀具有将七元环结构作为关键步骤。对于最稳定的C _7H_6Xe〜(2+)异构体(环庚三烯二烯双键和氙之间的加合物),计算出的1.36 eV结合能达到(弱)共价键的强度。因此,在寻找新的稀有气体化合物时,衍生自卡宾的亲电试剂可能是特别有希望的候选物。

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