Unsubstituted Cyclidenes-A Novel Family of Lacunar Dioxygen Carriers with Enhanced Stability toward Autoxidation: Synthesis, Characterization, and a Representative X-ray Structure

摘要

A major advance has been made in the incremental molecular design of long-lived cobalt(Ⅱ) dioxygen carriers. Preceding mechanistic studies revealed that ionizable methyl groups trigger the autoxidation of the O_2 adduct of the cobalt(Ⅱ) cyclidene. Two members of a new family of unsubstituted (no methyl groups) lacunar cyclidene dioxygen carriers have been prepared in an eight-step synthesis, and a complex with a hexamethylene bridge has been structurally characterized.