Reversible Mechanical Induction of Optical Activity in Solutions of Soft-Matter Nanophases

被引：35

作者：

Arteaga, Oriol ^{[3
,4
]}

Escudero, Carlos ^{[1
,2
]}

Oncins, Gerard ^{[5
,6
]}

El-Hachemi, Zoubir ^{[8
]}

Llorens, Joan ^{[7
]}

Crusats, Joaquim ^{[1
,2
]}

Canillas, Adolf ^{[3
,4
]}

Ribo, Josep M. ^{[1
,2
]}

机构：

[1] Univ Barcelona, Dept Organ Chem, E-08028 Barcelona, Catalonia, Spain

[2] Univ Barcelona, ICC, E-08028 Barcelona, Catalonia, Spain

[3] Univ Barcelona, Dept Appl Phys & Opt Sci, E-08028 Barcelona, Catalonia, Spain

[4] Univ Barcelona, Inst Nanociencia & Nanotecnola IN2UB, E-08028 Barcelona, Catalonia, Spain

[5] Univ Barcelona, Sci Serv, E-08028 Barcelona, Catalonia, Spain

[6] Univ Barcelona, Inst Bioengn Catalonia IBEC, E-08028 Barcelona, Catalonia, Spain

[7] Univ Barcelona, Dept Chem Engn, E-08028 Barcelona, Catalonia, Spain

[8] CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain

来源：

CHEMISTRY-AN ASIAN JOURNAL | 2009年 / 4卷 / 11期

关键词：

chirality; circular dichroism; nanoparticles; self-assembly; supramolecular chemistry; SCULPTURED THIN-FILMS; INDUCED CHIRALITY; PORPHYRIN; ELLIPSOMETRY; SHEAR; WATER; SIMULATIONS; RESOLUTION; SELECTION; CALCITE;

D O I：

10.1002/asia.200900254

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Nanophases of J-aggregates of several achiral amphiphilic porphyrins, which have thin long acicular shapes (nanoribbons), show the immediate and reversible formation of a stationary mechano-chiral state in the solution by vortex stirring, as detected by their circular dichroic signals measured by 2-modulator generallized ellipsometry. The results suggest that when a macroscopic chiral force creates supramolecular chirality, it also creates an enantiomeric excess of screw distortions, which may be detected by their excitonic absorption. An explanation on the effect of the shear flow gradients is proposed on the basis of the orientation of the rotating particles in the vortex and the size, shape, and mechanical properties of the nanoparticles.

引用

页码：1687 / 1696

页数：10

共 78 条

[1] Skeleton of Euplectella sp.:: Structural hierarchy from the nanoscale to the macroscale [J].