Co-assembling system that exhibits bright circularly polarized luminescence

Abstract

A co-assembling system composed of a nonchiral metal-free dye and chiral-molecular-assembly template can be a promising candidate for circularly-polarized luminescent materials with both a high luminescence dissymmetry factor and strong emission.

Controlled packing of chiral assembly scaffolds to promote chiral J-aggregation of carbocyanine dyes

“…To achieve efficient J-aggregate formation and the desired chirality, tight packing of the assembling molecules should be balanced by some flexibility for chirality. Among the reports on the assemblies of amino acid-derived amphiphiles (in particular, glutamic acid) with a double long alkyl chain and an ionic group, [16][17][18][19]23 our work is the first to reveal the effects of the alkyl chain length, the side chain length, and the kind of the ionic group in the amino acid-derived amphiphiles on the gel-to-liquid crystalline phase transition and chiral aggregation of dyes. This strategy of inducing chiral J-aggregation could be applied to other cyanine dyes except for monomethine.…”

“…This small redshift is ascribed to the embedment of Cy2 in the hydrophobic microenvironment. 17,21 Therefore, Cy2 did not form J-aggregates but was embedded in the hydrophobic cavities of the assembly. The CD signal of the Cy2-12-Or system was inverted in comparison to those of the Cy2-other amphiphile systems.…”

“…16 Moreover, a carbocyanine dye bound to lysine-derived amphiphile assemblies demonstrated excellent chiroptical properties. 17 However, the intention of these studies was to embed dye molecules as monomeric species in the hydrophobic cavities of the assemblies. [16][17][18] In this study, we constructed assembly scaffolds with densely and chirally arranged binding sites from lysine-derived amphiphiles with a pyridinium cation for the chiral J-aggregation of cyanine dye molecules having two anionic sites.…”

“…17 However, the intention of these studies was to embed dye molecules as monomeric species in the hydrophobic cavities of the assemblies. [16][17][18] In this study, we constructed assembly scaffolds with densely and chirally arranged binding sites from lysine-derived amphiphiles with a pyridinium cation for the chiral J-aggregation of cyanine dye molecules having two anionic sites. To define the optimal amphiphile structure for the chiral J-aggregation, we investigated the effect of the length of the double alkyl chain (tail), the type of the ionic group (head), and the length of the side chain (''m'' in Fig.…”

Two-Dimensionally Grown Periodic Pores Formed by Anodization of p-Type Silicon in Concentrated NH4F Aqueous Solution: A Platform for Maskless Patterning of Metals by Electrodeposition

“…Self-organization classified as self-assembly and spatiotemporal pattern formation has been expected to be a powerful strategy to produce functional materials at low cost without complex processes. Thus far, extensive efforts have been devoted to the self-organized production of functional materials such as porous oxides, , supramolecular assemblies, , and fractal surfaces. , In some cases, such self-organized structures serve as templates for the production of materials with properties of interest − and are used as optical, − chemical, , sensing, , and other functional − materials with slight modifications to achieve the best performance. The wide applicability of self-organization facilitates material fabrication with specific functions originating from self-organization.…”