Spin-state engineering of cobalt(IV)-oxo enables direct oxygen atom transfer for high-efficiency olefin epoxidation - Xue Li; Yufan Zhang; Jie Yang; Jikun Li; Xiaohui Wang; Tiantian Chen; Guangming Zhan; Chuncheng Chen; Mingce Long; Lizhi Zhang (Proceedings of the National Academy of Sciences, 2026)