A [2]rotaxane featuring a functional organometallic Ag₈ host, its transmetalation to the respective Au₈ analogue, and reversible switching to an organic [3]rotaxane under acidic conditions are demonstrated. The interlocked assembly enhances the kinetic stability of the NHC host complex by a factor of >1000, which corresponds to the first observation of a stabilizing “rotaxand effect”.

中文翻译：

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pH依赖型机械互锁开关：有机金属[2]轮烷与有机[3]轮烷

证明了具有功能性有机金属Ag ₈主体的[2]轮烷，其可转金属成相应的Au ₈类似物，并在酸性条件下可逆地转换为有机[3]轮烷。互锁的组件将NHC宿主复合物的动力学稳定性提高了> 1000倍，这对应于首次观察到稳定的“ rotaxand效应”。