Zhang H, Zhou B, Li H, Qu DH, Tian H
A Ferrocene-Functionalized Rotaxane with Two Fluorophores as Stoppers.
The Journal of organic chemistry. 2012 Oct 29;
In the past few decades, bi-stable rotaxanes have been extensively studied because of their applications in the fields of functional molecules and molecular machines. In this paper, a di-ferrocene-functionalized rotaxane with two fluorophores as stoppers was designed, perpared and studied. In this bi-stable rotaxane, a dibenzo-24-crown-8 macrocycle functionalized with two ferrocene moieties as electron donors can reversibly shuttle between two distinct stations, namely, a dialkylammonium recognition site and a N-methyltriazolium recognition site, by external acid-base stimuli, which has been demonstrated using 1H NMR spectroscopy. It has been shown that, by introducing two ferrocene units into the macrocycle component, the fluorescence of two fluorescent stoppers, such as the anthracene fluorophore and the 4-morpholin-naphthalimide fluorophore, respectively, can be changed in an alternate mode by an adjustable, distance-dependent photo-induced electron transfer process that occurs between the ferrocene electron donors and each of the two fluorophores.