A Study Of Binding Interactions Between Terpyridine Derivatives And Cucurbit[10]uril

2,2':6',2''-terpyridine(TPY)and its derivatives could form stable pseudo-octahedral coordination complexes with numerous transition metal ions,owing to its conjugate?bond and high activity of the three nitrogen atoms.Moreover,as a consequence of intramolecular energy and electron transfer,the TPY-Metal ion complexes exhibit characteristic optical and electrochemical properties.Cucurbit[n]uril(CB[n])is one of the most typical host molecules which usually has an influence on the optical property of the guest.And the involving of a luminescent transition metal complex reported by Wallace inspired us that with a similar structure and size,terpyridine and its derivatives could also enter the cavity of CB[10].Herein,we reported systematic investigation of the binding behaviors between CB[10]with terpyridine and its metal-derivatives.First of all,a set of TPY derivatives were synthesized,and then the binding behaviors were explored by ~1H NMR titration,UV-Vis,emission spectroscopy and ESI mass spectrometry,meanwhile the progress and applications prospect of these complexes in the filed are introduced.The results show that CB[10]can encapsulate methylated TPY(MTPY)by ~1H NMR titration,and the binding ratio between guest MTPY and host was 1:1 and 2:1 by ESI-MS.Three binding modes(1:1,1:2 and 1:3)have been detected for the binding of the metal-MTPY complexs with CB[10].