Polymers bearing hydrogen storage units store hydrogen gas via chemical bond formation, and have inherent advantages as quasi‐solid polymeric hydrogen carriers, such as handling easiness and high safety. A recent study demonstrated that a poly(6‐vinyl‐1,2,3,4‐tetrahydroquinoxaline) gel‐like solid was dehydrogenated over 5 h under 120°C and air, and then the material was reversibly hydrogenated under 60°C and ambient hydrogen pressure in the presence of an iridium complex catalyst. The present work aimed to improve the dehydrogenation rate via the substitution of methyl groups for hydrogen atoms on carbon atoms adjacent to the nitrogen atoms in the quinoxaline unit. The dramatic improvement was attributed to the electron donating property of methyl group, and stabilization of the dehydrogenated state. The poly(6‐vinyl‐2,3‐dimethyl‐1,2,3,4‐tetrahydroquinoxaline) gel‐like solid was rapidly dehydrogenated within 2 h under the same mild conditions. This article provides a guideline for the molecular design of nitrogen heterocyclic compounds for rapid dehydrogenation.

中文翻译：

---

聚（6-乙烯基-2-3,3-二甲基-1,2,3,4-四氢喹喔啉）凝胶状固体的可逆可逆氢化

带有氢存储单元的聚合物通过化学键形成来存储氢气，并具有作为准固体聚合物氢载体的固有优势，例如操作简便和安全性高。最近的一项研究表明，聚（6-乙烯基-1,2,3,4-四氢喹喔啉）凝胶状固体在120°C和空气中经过5小时脱氢，然后在60°C和60°C下可逆氢化。在铱络合物催化剂存在下的环境氢气压力。本工作旨在通过用甲基取代喹喔啉单元中与氮原子相邻的碳原子上的氢原子来提高脱氢速率。显着的改善归因于甲基的给电子性和脱氢状态的稳定。聚（6-乙烯基-2,3-二甲基-1,2,3，在相同的温和条件下，在2小时内将4-四氢喹喔啉）凝胶状固体迅速脱氢。本文为快速脱氢的氮杂环化合物的分子设计提供了指导。