Three‐Component Multiblock 1D Supramolecular Copolymers of Ir(III) Complexes with Controllable Sequences

Abstract

Multicomponent supramolecular block copolymers (BCPs) have attracted much attention due to their potential functionalities, but examples of three‐component supramolecular BCPs are rare. Herein, we report the synthesis of three‐component multiblock 1D supramolecular copolymers of Ir(III) complexes 1–3 by a sequential seeded supramolecular polymerization approach. Precise control over the kinetically trapped species via the pathway complexity of the monomers is the key to the successful synthesis of BCPs with up to 9 blocks. Furthermore, 5‐block BCPs with different sequences could be synthesized by changing the addition order of the kinetic species during a sequentially seeded process. The corresponding heterogeneous nucleation‐elongation process has been confirmed by the UV/Vis absorption spectra, and each segment of the multiblock copolymers could be characterized by both TEM and SEM. Interestingly, the energy transfer leads to weakened emission of 1‐terminated and enhanced emission of 3‐terminated BCPs. This study will be an important step in advancing the synthesis and properties of three‐component BCPs.

Strategies for Synthesizing Supramolecular Block Copolymers

“…[19] Very recently, sequence regulation of three-component 5-block supramolecular BCPs of Ir III complexes have been successfully realized by Che and us, providing 1D supramolecular BCPs with up to 9 blocks (Figure 6c). [20] In addition to the complexity brought by increasing the number of components, researchers have recently developed other block structures with complicated topologies. [21] These studies will pave the way for the Although the examples discussed above are based on different types of monomers, it can still be seen that similar or complementary structures appear to be essential to achieve supramolecular block copolymerization.…”

Carbazolyl-Modified Neutral Ir(III) Complexes for Efficient Detection of Picric Acid in Aqueous Media

“…Our group possesses an enduring interest in investigating the relationship between the structural composition and functional properties of cyclometalating Pt(II) and Ir(III) complexes [25][26][27][28][29]. Recently, we have successfully applied cationic Ir(III) complexes with AIPE properties for the detection of PA in aqueous media with high sensitivity [30,31].…”

Seeded Growth of Three-Dimensional Block Heterojunctions Featuring Photoinduced Emission Enhancement

“…Organic heterojunctions of varying dimensions have wide applications in solar cells, lasers, diodes, and transistors. − However, research on three-dimensional (3D) organic heterojunctions predominantly concentrates on bulk heterojunctions, which are created using donor and acceptor molecules and are essential for the efficiency of organic photovoltaics. − By contrast, the construction of 3D block heterojunction architectures composed of different individual blocks, analogous to one-dimensional (1D) − or two-dimensional (2D) multiblocks, − remains largely unexplored. Given that 3D block heterojunctions likely possess unexpected optoelectronic properties beyond those of 1D and 2D heterojunctions, developing methodologies to create such 3D heterojunctions is of considerable interest in both fundamental and applied research.…”