《Table 1 Products, pseudo-first-order rate coefficients (k) , and reaction efficiencies (Φ) for the

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《"VO_(1-4)~+阳离子与n-C_mH_(2m+2)(m=3,5,7)烷烃的反应性研究:氧含量和碳链长度的影响（英文）"》

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aThe reactant-gas-pressure dependent experiments are shown in Fig.S2.

The VO+1-4cationic were generated，mass-selected，confined，and cooled（Fig.S1a，e，i，m，Supporting Information），and then they interacted with linear alkanes C3H8，n-C5H12 and n-C7H16in the ion trap reactor（Fig.S1）.Among the investigated reactions，the reactivity of VO2+is higher than other three cations.For VO2+，after the interactions of VO2+with 12 m Pa C3H8 for about 0.91 ms as shown in Fig.S1f，product peaks assigned as VO2C3H8+and VO2C3H6+（Equations S3a，b in Table S1）were generated，the adoption channel and dehydrogenation channel are the major channel.Upon the interaction of VO2+with 3.6 m Pa n-C5H12 for about 1.3 ms in the reactor as shown in Fig.1d，the channels of C―C and C―H bonds activation of n-C5H12 with generation of VO2C3H6+（Equation 2a in Table 1），VO2C2H6+（Equation 2b in Table 1），and VOC5H8+（Equation 2c in Table 1）are much more obvious；some weak peaks，assigned to VO2H2+，VO2C5H8+，VO2C5H+10and VO2C5H+12（Equations 2d，e in Table 1），were also observed.Upon the reactions of VO2+with 1.3 m Pa n-C7H16 for 1.01 ms（Fig.S1h），the channels of C―C bond activation of n-C7H16 leading to VO2Cn H+2n（n=3，4，5）（Equations S4a–c in Table S1） and lighter alkanes are obvious.It can be seen that C―C bond activation of n-C5H12mediated by VO2+become the major channel as the carbon chain length increasing.Moreover，oxygen atom transfers product C2H6O shows up in the reaction of VO2+and n-C7H16.