Solvent‐Controlled Assembly of Aromatic Glutamic Dendrimers for Efficient Luminescent Color Conversion

Abstract

A binary supramolecular system where self-sorting and coassembly behavior can be switched by changing the solvent polarity is hereby reported. Glutamic dendron is separately conjugated with pyrene and naphthalimide luminophores through an alkyl spacer. The resulting structurally similar building units can self-assemble into one-dimensional micro/nanostructures with hexagonal and lamellar packing, respectively. Varying solvents from polar aqueous solution to nonpolar decane is evidenced to profoundly inverse the superchirality and switch self-sorted assembly to coassembly of the two building blocks. The moisture sensitivity of the naphthalimide moiety is considered the primary driving force for the self-sorting phenomenon in aqueous solution, resulting in inevitable hydration to repel its stacking with hydrophobic pyrene moiety. On the other hand, the naphthalimide unit can integrate segmentally with the pyrene unit in decane, greatly facilitating the nanofiber growth and supramolecular gel formation along with improved energy transfer efficiency between luminophores. As a result, the coassembly-based thin films show efficient luminescent color conversion upon the UV light irradiation. This research presents a useful route for the fabrication of controllable solution-processed light emitting devices from self-assembled multicomponent systems.

Diverse Atomically Sharp Interfaces and Linear Dichroism of 1T' ReS2‐ReSe2 Lateral p–n Heterojunctions

“…2D heterojunctions of transition‐metal dichalcogenides (TMDs) have great potential for application in electronic and optoelectronic devices, such as light‐emitting diodes, tunneling transistors, photodetectors, and photovoltaic cells . To that end, there has been a significant effort toward the fabrication of the heterojunctions based on atomically thin building blocks . A series of group VI‐TMD‐based lateral heterojunctions and even superlattices (such as MoS 2 ‐MoSe 2 , MoS 2 ‐WSe 2 , and MoS 2 ‐WS 2 ‐MoS 2 ‐WS 2 ), which possess highly symmetry hexagonal (2H) structure, have been successfully synthesized via single‐step, two‐step, or multi‐step growth strategies .…”

Programmable Multicomponent Self‐Assembly Based on Aromatic Amino Acids

“…To this end, either strong binding interaction or considerable structural similarity between different components is a prerequisite. For instance, utilizing complementary hydrogen bonding and structural similarity, we have developed amino acid derivative‐bipyridine coassembly systems for superchirality control, and glutamic analogue coassembly for light harvesting . Although some two‐component assemblies could be predesigned, the realization of ordered coassembly comprising of three or more components is greatly restricted .…”

Chiroptical Helices of N‐Terminal Aryl Amino Acids through Orthogonal Noncovalent Interactions

“…One key issue is the complexity of the intrinsic pathway . And the number of competitive pathways would be dramatically increased in the self‐assembly of three or more components . As a consequence, almost all the multiple‐component, chiral self‐assemblies comprise two components and employ hydrogen bonds between species .…”

“…[14] And the number of competitive pathways would be dramatically increased in the self-assembly of three or more components. [15] As ac onsequence,a lmost all the multiple-component, chiral self-assemblies comprise two components and employ hydrogen bonds between species. [16][17][18][19][20][21][22] Fori nstance,F eng et al explored the influence of bipyridine in tuning the supramolecular chirality of terephthalic phenylalaine derivatives.…”