Based On Acid-base Regulation Of The Synthesis Of "muscle-type" Molecular Machine Building Units

The donor-acceptor(D-A)distance and the structure of D-A aggregates are of pivotal importance for the rates and efficiencies of photo-induced electron transfer(PET)reactions occurring in light-to-chemical energy conversion and molecular electronics.In recent years,a variety of molecular machines which can respond to external stimuli has been synthesized based on the theory of molecular recognition and supramolecular assemblies.The relative motions between molecules can be realized on the single molecular level(nano-regimes precisely).Combining this molecular motion controlling method with the art of supramolecular assembly to molecular electronics to achieve macroscopic material property changes from the molecular arena would be very interesting.The main objective of this work is to develop a pH-controllable supramolecular structures based on a D-A decorated rotaxane blocking units which can contract and extend upon pH modulation.The details are showed bellows:1.The blocking units were designed and successfully synthesized.All the compounds were characterized by 1H NMR;2.The pseudorotaxane was synthesized based on host-guest recognition,1H NMR spectrum shows that:1)pseudorotaxane is much stable in chloroform;2)it exist as three forms:free secondary ammonium salt and crown ether,pseudorotaxane;3)we can conclude that the terpyridine has no influence on the host-guest interaction;3.The synthetic conditions of "molecular machines" was explored.