Construction Of Metallo Platinum(Ⅱ) Supramolecular Assembly And Its Properties Research

Self-assembly is one of the essential contents of life science. Biological systemscan use non-covalent interactions to form highly-ordered and functional assemblyaccurately. Inspired by nature, construction of supramolecular polymers throughself-assembly has become an important direction of polymer science. Platinum acetylideacts as an ideal unit since its square planer configuration and unsaturated coordinationmake it capable to couple with other non-covalent bonds effectively, that leading uniquespectroscopic properties. In this dissertation, we choose platinum acetylide as a basicunit, introduced π–π stacking, hydrogen bonding and Pt–Pt interactions to achieve“bottom up” self-assembly and built new functional supramolecular assembly,comprising three parts:In the first part，rod-like platinum(II) acetylide complexes have been demonstratedto form one-dimensional helical supramolecular polymers through the efficient couplingof π–π stacking and hydrogen bonds, which leading the cooperative growth mechanism.Thermodynamic parameters such as enthalpy, entropy, Gibbs free energy duringpolymerization were obtained by spectroscopic measures and mathematical fittings.What,s more, it is found to be soft materials like supramolecular gels or liquid crystalmaterials in some condition, which showing fluorescent properties.Based on the first part, we induced B18C6motifs to construct platinum()acetylide bolaamphiphile. In chloroform, high-affinity molecular recognition between itand L-alanine ester salt is verified, which appears to be cooperative with the rotio of1:2.However, in methanol/chloroform (3:1, v/v), hydrogen bonds and π–π stacking woulddrive the host molecule self-assemble into spherical vesicles about200nm, and thestructure would be destroyed upon the addition of the amino acid derivatives.In the third part, tridentate Pt()/Au(III) complexes were designed and synthesized,both of which could self-assemble into one-dimensional supramolecular polymers.However, the tridentate Pt() complex was driven by an extra Pt-Pt metal-metal bond inthe assembly process when compared to the Au(III) complex, achieving effectivelycontrolled of non-covalent bonds in self-assembly.