Reactions of Cations Derived from Naphthalene with Molecules and Atoms of Interstellar Interest

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• 作者：Valé ; ry Le Page ; Yeghis Keheyan ; Theodore P. Snow ; and Veronica M. Bierbaum
• 刊名：Journal of the American Chemical Society
• 出版年：1999
• 出版时间：October 13, 1999
• 年：1999
• 卷：121
• 期：40
• 页码：9435 - 9446
• 全文大小：174K
• 年卷期：v.121,no.40(October 13, 1999)
• ISSN：1520-5126

文摘

The chemistry of naphthalene radical cation and its derivatives (C<SUB>10H_n⁺, n = 6,7,8,9) has beenstudied with molecules and atoms of interstellar interest in a selected ion flow tube. The radical cation C₁₀H₈⁺is unreactive with H₂, CO, H₂O, and NH₃ but reacts with H, O, and N atoms. Adduct formation is the onlychannel detected in the case of reaction with H atoms, but additional channels contribute in reactions betweenC₁₀H₈⁺ and O and N atoms; these latter reactions proceed through novel reaction pathways via C and CHabstraction, leading to the formation of the stable compounds CO and HCN, respectively. The closed-shellnaphthylium cation C₁₀H₇⁺ is essentially unreactive with atoms but associates via nucleophilic addition withmost of the molecules studied. The reaction kinetics are close to saturation in the accessible helium pressurerange. The naphthyne radical cation C₁₀H₆⁺ does not react with H₂, CO, or H₂O but forms an adduct withNH₃ at a moderate rate. Reactions with atoms were found to be very similar to those of C₁₀H₈⁺. The implicationsof these results for the stability of polycyclic aromatic hydrocarbon cations in the interstellar medium arebriefly discussed.