Noncovalent metal···metal interactions have attracted increasing attention in the field of supramolecular chemistry and materials science. Here we demonstrated the design and synthesis of two-dimensional (2D) honeycomb-like supramolecular polymers based on trinuclear platinum(II) complexes via specific Pt(II)···Pt(II) interactions. Interestingly, such 2D soft materials can be solution-processable into a highly oriented supramolecular membrane by dropcasting on polycarbonate filter supports. Because of its thin active layer, the composite membrane shows ultrahigh water permeation. Furthermore, the functions of membrane are versatile, which enables not only highly efficient and selective uptake of platinum ions from water, but also precise size-selective sieving of colloidal nanoparticles. Moreover, trinuclear platinum(II) derivatives can be further rationally designed to tune the self-assembled structure and versatile functionalities, in terms of cavity sizes, photoluminescence colors, as well as water permeability, in response to acid–base stimuli. Towards the emerging membrane-based separation technologies, our works open up a new avenue for creating supramolecular membranes with tunable properties to fulfill specific needs, including solution-processability, flexibility, recyclability, structural ordering, multifunctionalities and stimuli-responsiveness.

Design and Applications of Two-Dimensional Supramolecular Polymers Based on Trinuclear Platinum(II) Complexes

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