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Theoretical study of the mechanism for C-H bond activation in spin-forbidden reaction between Ti+ and C2H4

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Abstract

The mechanism of the spin-forbidden reaction Ti+(4F, 3d24s1) + C2H4→TiC2H2 + (2A2) + H2 on both doublet and quartet potential energy surfaces has been investigated at the B3LYP level of theory. Crossing points between the potential energy surfaces and the possible spin inversion process are discussed by means of spin-orbit coupling (SOC) calculations. The strength of the SOC between the low-lying quartet state and the doublet state is 59.3 cm−1 in the intermediate complex IM1-4B2. Thus, the changes of its spin multiplicity may occur from the quartet to the doublet surface to form IM1-2A1, leading to a sig-nificant decrease in the barrier height on the quartet PES. After the insertion intermediate IM2, two distinct reaction paths on the doublet PES have been found, i.e., a stepwise path and a concerted path. The latter is found to be the lowest energy path on the doublet PES to exothermic TiC2H2 +(2A2) + H2 products, with the active barrier of 4.52 kcal/mol. In other words, this reaction proceeds in the following way: Ti++C2H4→4IC→IM1-4B2→4,2ISC→IM1-2A1→[2TSins]→IM2→[2TSMCTS]→IM5→TiC2H2 +(2A2)+H2.

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Authors and Affiliations

  1. College of Life Science and Chemistry, Tianshui Normal University, Tianshui, 741001, China

    LingLing Lv, XinWen Liu, Kun Yuan & XiaoFang Wang

  2. College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, 730070, China

    YongCheng Wang

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  1. LingLing Lv
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  2. XinWen Liu
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Correspondence to LingLing Lv.

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Supported by ‘Qinglan’ Talent Engineering Funds by Tianshui Normal University.

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Lv, L., Liu, X., Yuan, K. et al. Theoretical study of the mechanism for C-H bond activation in spin-forbidden reaction between Ti+ and C2H4 . Sci. China Ser. B-Chem. 52, 295–303 (2009). https://doi.org/10.1007/s11426-009-0062-7

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