Self‐Assembly of Chiral Gold Clusters into Crystalline Nanocubes of Exceptional Optical Activity

Abstract

Self-assembly of inorganic nanoparticles into ordered structures is of interest in both science and technology because it is expected to generate new properties through collective behavior;h owever,s uch nanoparticle assemblies with characteristics distinct from those of individual building blocks are rare.Herein we use atomically precise Au clusters to make ordered assemblies with emerging optical activity.Chiral Au clusters with strong circular dichroism (CD) but free of circularly polarized luminescence (CPL) are synthesized and organized into uniform body-centered cubic (BCC) packing nanocubes.O nce the ordered structure is formed, the CD intensity is significantly enhanced and ar emarkable CPL response appears.B oth experiment and theory calculation disclose that the CPL originates from restricted intramolecular rotation and the ordered stacking of the chiral stabilizers, which are fastened in the crystalline lattices.

Ultrastable atomically precise chiral silver clusters with more than 95% quantum efficiency

“…The maximum g lum values for clusters Ag 6 L 6 /D 6 in dilute solution were measured to be approximately ±4.42 × 10 −3 ( fig. S8), which are comparable to that of chiral gold clusters (27) and inorganic quantum dots (30). A similar phenomenon occurred for PL/PD ligands and Ag 6 PL 6 /PD 6 clusters in solution ( fig.…”

“…The luminescence anisotropy factor (g lum ) can be used to quantify the performance of CPL-active materials. The dissymmetric extent of emission was quantified by the dissymmetric factor, g lum [g lum = 2(I L − I R )/ (I L + I R ) (27)(28)(29)(30), where I L and I R are the intensities of left-and righthanded CPL, respectively]. The maximum g lum values for clusters Ag 6 L 6 /D 6 in dilute solution were measured to be approximately ±4.42 × 10 −3 ( fig.…”

Gold Nanoparticle Enantiomers and Their Chiral-Morphology Dependence of Cellular Uptake

“…7 Recently, the fascinating functions of chiral nanoparticles (NPs) have attracted extensive research, due to the structural parallels between them and biomaterials as well as potential biomedical applications. [8][9][10][11][12] The generation of chiral NPs involves three general strategies: (type I) achiral NPs with chiral surface molecular ligands, [13][14][15] (type II) assembly of achiral NPs with chiral spatial arrangement normally induced by chiral molecular linkers, [16][17][18][19][20][21][22][23][24][25] and (type III) single NPs with chiral morphologies generally synthesized with chiral surface ligands. [26][27][28] The cellular interactions of achiral NPs with chiral surface ligands (type I) have been extensively studied.…”

De novo design of Au36(SR)24 nanoclusters

“…T hiolate-protected atomically precise gold nanoclusters referred to as Au n (SR) m (n = gold atom number; m = ligand number) constitute a generation of gold nanoparticles and exhibit unique physical and chemical properties in optics, electronics, catalysis, chirality, and sensing [1][2][3][4][5][6][7][8][9] . Since the total structure of Au 102 (SR) 44 was resolved 10 , the synthesis of one pot for one size starts to bloom and gold nanoclusters are constantly springing up [11][12][13][14][15][16][17][18] .…”