How Do the Position and Number of Methyl Substituents Affect the Photochemical Process of Criegee Intermediate? Trajectory Surface-Hopping Dynamics of Four-Carbon CIs.

Electronic-structure calculations combined with nonadiabatic trajectory surface-hopping (TSH) dynamic simulations were carried out on two alkenyl-substituted Criegee intermediates (CIs), i.e., propenyl-substituted CI (PCI) and 1-methyl-propenyl substituted CI (MPCI), in order to investigate the influence of the position and number of substituents on the photochemical process of CI in S1 states. It is found that they play critical roles in the reactivity, dominant product channel, and mechanism of the CIs. More specifically, introducing a methyl group on either C1 (α-C) or C3 (γ-C) position of a vinyl-substituted CI (VCI) skeleton facilitates the rotation of the C1═O1 bond and leads to the formation of a three-membered dioxirane ring; meanwhile, it evidently enhances the reactively of the S1-state molecule. Meanwhile, methyl substitution on the vinyl moiety [i.e., C2 (ß-C) and C3 (γ-C) positions] is beneficial for the rotation of the C2═C3 bond and thus facilitates the formation of the five-membered 1,2-dioxole ring, and the substitution on C2 site decreases the reactivity. The cosubstitution of C2 and C3 atoms by methyl groups well balances the features of VCI in the sense of high reactivity, consistently predominant channel, and possible dioxole side-product. The findings here not only deepen the knowledge on the photochemical processes of the CI but also inspire the rethinking of the "old" concept of substitution effect.

Can closed-off management in communities alleviate the psychological anxiety and stress caused by the COVID-19 pandemic?

Since the outbreak of the novel coronavirus (COVID-19) pandemic, the number of individuals infected with the COVID-19 has been increasing worldwide, posed a substantial threat to mental health. Therefore, discovering the means for blocking the transmission path of COVID-19 and improving mental health is of great significance. Based on a survey on the life of urban and rural residents in China (in 2020), the study applied the least squares method to analyse the effect of closed-off management on the psychological anxiety and psychological stress caused by the COVID-19 pandemic. Furthermore, the bootstrap decomposition method was used to test for the mediating effects of satisfaction with and confidence in pandemic prevention. The study found that closed-off management in communities exerted a negative effect on psychological anxiety and stress caused by the COVID-19 pandemic. Additionally, satisfaction with and confidence in pandemic prevention played a mediating role on the psychological anxiety and stress caused by the COVID-19 pandemic. Therefore, closed-off management in communities will not only prevent the spread of the COVID-19, but also improve satisfaction with and confidence in pandemic prevention and control. Furthermore, it will alleviate the psychological anxiety and stress caused by the COVID-19 pandemic.