Soluble Two-dimensional Supramolecular Organic Frameworks (SOFs): An Emerging Class of 2D Supramolecular Polymers with Internal Long-range Orders

Toward a Two-Dimensional Supramolecular Organic Framework with High Degree of Internal Order via Amphiphilic Modification

“…Inspired by nature's elegant use of amphiphilicity and the successful construction of numerous welldefined self-assembled architectures and functional systems, [52][53][54][55] as well as 2D supramolecular assemblies [56][57][58][59][60] based on artificial amphiphilic organic building blocks, herein, we report an amphiphilic modification approach to improve 2D self-assembly in water, which enables the construction of a 2D SOF with an unprecedentedly high degree of internal order and long-range periodicity (Scheme 1). In contrast to the previously reported 2D SOFs that all exist as monolayers with homogeneous surfaces, [29][30][31][45][46][47][48][49][50][51] the as-formed SOF has a unique Janus feature and can exist as bilayers (Scheme 1). Furthermore, the crucial role that amphiphilicity plays in the construction of the highly ordered 2D SOF has been revealed by a comparative study between the amphiphilic building block and its nonamphiphilic analog.…”

“…The design principle for the building block was based on the approach of shape-directed self-assembly and the driving force was the CB [8]-based host-guest chemistry. [61][62][63] In contrast to the previous designing strategies, [29][30][31][45][46][47][48][49][50][51] in this work, three hydrophilic oligo (ethylene glycol) moieties and three hydrophobic hexyl chains were attached to the arms of a C 3 -symmetric building block (1 in Scheme 1). Such modification made the building block amphiphilic, which, as we envisioned, should facilitate structural preorganization during the self-assembly process.…”

“…44 Among these, the cucurbit [8]uril (CB [8])mediated shape-directed assembly has been proven to be a sufficient strategy capable of directing a 2D extension of building blocks, from which monolayer 2D supramolecular organic frameworks (SOFs) have been constructed in solution phase. [45][46][47][48][49][50][51] However, despite these significant progresses, the development of selfassembled 2D structures toward more innovative applications has been discouraged by the annoying problem of rarely producing such nanomaterials with long-range internal order. Although this challenge can be partly addressed by performing self-assembly at interfaces, 30,[33][34][35] the interface-confinement effect will be lost when a self-assembly process occurs in solution phase.…”

Supramolecular Chiral 2D Materials and Emerging Functions

“…For this reason, several approaches are developed to avoid the aggregation of the sheets and maintain stable 2D layered materials. These include self‐assembly of amphiphiles, peptide assembly, host–guest interactions, and postmodification . Taking advantage of the reduction in thickness, the substrates can be efficiently and reversibly bound to and released from the 2D chiral materials.…”

Construction of two-dimensional supramolecular nanostructure with aggregation-induced emission effect via host–guest interactions

“…For example, the 2D supramolecular organic framework (SOF) has been widely accepted for its good orderliness and solubility. [30][31][32][33][34][35][36] In this work, a fabricated 2D supramolecular nanostructure with outstanding AIE properties was prepared in aqueous phase (Scheme 1). A TPE derivative with four 4-vinylpyridium arms as the guest molecule was designed (Scheme 1a).…”