Supramolecular Tweezer/Guest Recognition And Assembly System Involving In Hydrogen Bond

Supramolecular chemistry is the domain of chemistry which research about the high-order sssemblies made up of a discrete number of assembled molecular motifs via non-covalent interactions.While traditional chemistry focuses on the covalent interaction,supramolecular chemistry examines the weaker noncovalent interactions between assembled components,such as hydrogen bonding,metal-ligand coordination,host-guest interaction,?-? stacking and hydrophobic interaction.The expansion of novel driving forces and new kind of recognition subunits are very importance for the development of supramolecular chemistry.In this respect,terpyridine alkynyl Pt(?)tweezer molecular due to its square planar configuration and fascinating optical properties,which elaborate combination of intermolecular Pt-Pt metal-meal interaction and donor-acceptor interaction,as an excellent building block of supramolecular system have received extensive attentions.On the basis of previous researches of our group about tweezer/pyrene recognition,in this dissertation we can significantly enhanced the binding affinity of this tweezer system by embedding an intermolecular O-H---N hydrogen bond and design supramolecular ?-conjugated polymer networks.In the first part,we sought to introduce hydrogen bonds into the molecular tweezer/guest recognition system,which represents an alternative strategy to design supramolecular system.We have demonstrated that implementing intermolecular O-H--N hydrogen bond facilitates to reinforce binding affinity between alkynylplatinum(?)terpyridine molecular tweezer and the naphthalene-derived guests.On this basis,photo-trigged supramolecular recognition system has been successfully fabricated via caging the hydroxyl group on the naphthol guests.Hence,this work demonstrates the versatility to modulate the non-covalent molecular tweezer/guest complexation via the assistance of hydrogen bonds,which would be advantageous for the development of novel types of chemo-and bio-sensors.In the second part,we have demonstrated an efficient approach toward novel main-chain supramolecular ?-conjugated polymer networks,by taking advantage of"hydrogen-bond enhanced molecular tweezer/guest complexation" strategy.Specifically,polycarbazoles can partially encapsulated into the cavity of the homoditopic molecular tweezer via the cooperative participation of donor-acceptor and intermolecular hydrogen bonding interactions.As a consequence,stimuli-responsive supramolecular polymer networks and gel material can form.For the resulting conjugated polymer networks,the elaborate combination of electrical conductivity and processability shows promising prospects for soft optoelectronics applications.