RESUMEN
The utilization of excitons is key to the effectiveness of organic electroluminescent materials. Recently, HLCT state materials were shown to use triplet excitons to achieve ultra-high electroluminescence efficiency. The large energy gap between triplet states (ΔE T1-T2 ) is key for these materials. In the current computational work, we used the anthracene structure with its large ΔE T1-T2 as a template, and to this skeleton we connected various substituents at different sites to explore the effects of these substituents on the excited states of the full molecule. We focused on the change of the ΔE T1-T2 . Based on our analysis, we concluded the strongly electron-withdrawing substituents and those groups containing oxygen atoms to have the greater influence on the excited state, and to yield anthracene derivatives no longer having the large triplet energy difference characteristic of the unsubstituted anthracene molecule.
RESUMEN
Objective To explore the causes of intrapartum rupture of the scarred uterus and sum up the nursing experience. Methods The clinical data of 11 parturients with intrapartum rupture of scarred uterus were retrospectively analyzed to find out the causes of rupture and the nursing strategies were summarized.Result All of them resovered after rescuing and nursing,who were hospitalized for 3-5d and got labored without accidents.The causes included their histories of uterine-incision delivery,living places, education level and individual constitution.Conclusion The nursing measures including intrapartum health care and education, antenatal examination,close observation through the labor process,enhanced techniques and monitoring of high-risk gravida to avoid rupture of uterus,are vital for the decrease of parturient mortality.
