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 pi-Ag+ interactions between the diacetylene moieties and Ag+ ions in a mixed DMSO/H2O (3 : 7 v/v) solvent system. The pi-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.