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.

分子伴侣在自然界中被广泛用作添加剂，以捕获处于动态状态的蛋白质，从而激发了动态捕获的人工超分子系统的发展。到现在为止，这种添加剂控制的方法已使稳定的扩展超分子结构稳定在动力学的捕获状态，而缺乏具有足够的动力学持久性的离散组件。在这项研究中，利用Cu ⁺构建了基于Pt（II）的离散超分子系统-桥联离子作为伴侣状添加剂。所得的四重Pt（II）堆积结构具有很高的动力学稳定性，可以在柱色谱条件下幸存。此外，即使在稀溶液中，动力学至热力学的转化也要花费数月的时间。有趣的是，由于四重堆栈中的π–π / Pt（II）–Pt（II）距离很近，因此动力学捕获态显示出非常低的能量吸收，从而在红/近红外光照射下产生了出色的光热转换，这是对于相同条件下的热力学状态是无法达到的。因此，本研究中所举例说明的添加剂控制策略为具有精确堆叠数和量身定制的功能的动态滞留组件提供了新途径。