Additive-Controlled Kinetic Trapping of Quadruple Platinum(II) Stacks with Emergent Photothermal Behaviors
Journal
CCS Chemistry
Journal Volume
3
Journal Issue
10
Pages
105-115
Date Issued
2021
Author(s)
Abstract
Molecular chaperones are widely employed as additives in nature to trap proteins in the kinetic state, which inspire the development of kinetically trapped artificial supramolecular systems. Till now, such additive-controlled approaches have enabled the stabilization of extended supramolecular structures in the kinetically trapped state, while discrete assemblies with sufficient kinetic persistence are scarce. In this study, a Pt(II)-based discrete supramolecular system has been constructed by taking advantage of Cu+-bridged ions as chaperone-like additives. The resulting quadruple Pt(II) stacking structure possesses high kinetic stability, which survives the column chromatography conditions. Moreover, it takes months for the kinetic-to-thermodynamic transformation to take place at ambient conditions even in dilute solutions. Intriguingly, the kinetically trapped state displays remarkably low-energy absorbance because of close π–π/Pt(II)–Pt(II) distances in the quadruple stacks, resulting in excellent photothermal conversion under red/near-infrared light irradiation, which is unattainable for the thermodynamic state under the same conditions. Therefore, the additive-controlled strategy exemplified in this study provides new avenues toward kinetically trapped assemblies with precise stacking numbers and tailored functionalities. ? 2021 CCS Chemistry. All Rights Reserved.
Subjects
Chaperone-like additives
Kinetic trapping
Photothermal conversion
Platinum(II) complex
Supramolecular assembly
Type
journal article