Switchable supramolecular polymers of a Pt(II) complex via diacetylene π–Ag+ interaction

Abstract

Controlling the driving forces during supramolecular polymerization represents a highly significant and challenging approach for the development of tailored supramolecular polymer systems for various applications. We report a switchable supramolecular polymerization system based on binuclear Pt(II) complex (Pt₂L¹) containing a diacetylene moiety, mediated by π–Ag⁺ interactions between the diacetylene moieties and Ag⁺ ions in a mixed DMSO/H₂O (3 : 7 v/v) solvent system. The π–Ag⁺ interaction functions as an additional driving force, significantly enhancing the strength of the supramolecular polymerization. Notably, the introduction of Ag⁺ into the solution of Pt₂L¹ led to a pronounced increase in photoluminescence intensity. The switchable behavior of the system was modulated through the sequential addition of a secondary ligand and metal ion. Thermodynamic parameters governing the supramolecular polymerization were elucidated by temperature-dependent photoluminescence spectroscopy.