Construction Of Functional Supramolecular Materials Via Organoplatinum(?) Self-assembly

In 1987,Lehn,Pederson and Cram were awarded the Nobel Prize in Chemistry for their outstanding contributions in the field of supramolecular chemistry.They used non-covalent interactions between molecules,such as hydrogen bonding and metal-organic ligand interactions,to form discrete molecular complexes.In the following decades,others expanded this concept to a larger length scales,thereby creating nanoscale supramolecular architectures and further organization of these nanostructures at macroscopic scales giving rise to functional supramolecular materials.One important field of supramolecular materials is functional supramolecular polymers.Supramolecular polymers,a polymeric arrays of monomer units assembled by reversible and highly directional non-covalent bonds.The dynamic properties of these materials deriving from reversible noncovalent bonds make supramolecular polymers attractive for various applications,such as drug delivery,biosensors,tissue engineering and actuators.Hydrogen bonding and metal-ligand coordination bond-driven self-assembly has proved to be an effective strategy for preparing supramolecular polymers because it allows the construction of well-defined supramolecular architectures and endows the resulting polymers with higher stability.Nowadays,the research in organoplatinum(II)coordination-driven supramolecular polymers have had a substantial effect on the design and synthesis of functional materials.In this paper,we have selected different metal organoplatinum(II)acceptors and crown ether derivatives(B21C7)to construct functional supramolecular materials via self-assembly strategies driven by metal coordination bonds or hydrogen bond s.1)A dual stimulus-responsive supramolecular material based on organ oplatinum(II)-crown ether complex was studied.It has been found that supramolecules based on crown ether derivatives have macroscopic temperature-sensitive phase transition behavior.Crown ether derivatives are an emerging strategy to obtain thermoresponsive materials.A thermo-/anion-dual-responsiveness supramolecular material was constucted by introducing a crown ether derivative B21C7 into a metal-ligand coordination-driven self-assembly system.The introduction of B21C7 makes the material have good LCST behavior with highly sensitive phase separation and excellent reversibility.By using the dynamic nature of metal-ligand bonds,the addition of various anions such as halogen s can destroy the dynamic metal-ligand bonds.Therefore,the supramolecular II is sensitive to various anions such as halogens.This research provides a theoretical basis for building new functional materials.2)The reasearch mainly studied supramolecular polymers containing structural-water.The application of structural water in supramolecular polymerization has not only effectively eliminated the negat ive influences of solvents from supramolecular polymer solutions or gels but has also provided new platorm for the fabrication of supramolecular polymer materials in bulk.After rationally analyzing the chemical structures of artificial monomers and gainin g a deep understanding of the structural-water-triggered polymerization process.We rationally designed low molecular weight monomers to self-assembly via a metal coordination bond to form LMWM containing organicplatinum(II),and then prepared supramolecular polymer materials driven by hydrogen bond formed by structural water.It has been found that supramolecular polymer materials have certain adhesion to biological tissues without cytotoxicity.Therefore,this work has potential application in bioadhesive materials.