Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation
In this study, we report the synthesis, characterization, and chiroptical properties of azo-group-containing chiral salen type Schiff base Ni(II), Cu(II), and Zn(II) complexes absorbed on gold nanoparticles (AuNPs) of 10 nm diameters. Induced circular dichroism (CD) around the plasmon region from th...
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doaj-3644031d0b8f480fb421496d16dc0f712020-11-24T20:42:49ZengMDPI AGSymmetry2073-89942019-09-01119109410.3390/sym11091094sym11091094Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light IrradiationNobumitsu Sunaga0Tomoyuki Haraguchi1Takashiro Akitsu2Department of Chemistry, Faculty of Science, Tokyo University of Science, 1–3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanDepartment of Chemistry, Faculty of Science, Tokyo University of Science, 1–3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanDepartment of Chemistry, Faculty of Science, Tokyo University of Science, 1–3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanIn this study, we report the synthesis, characterization, and chiroptical properties of azo-group-containing chiral salen type Schiff base Ni(II), Cu(II), and Zn(II) complexes absorbed on gold nanoparticles (AuNPs) of 10 nm diameters. Induced circular dichroism (CD) around the plasmon region from the chiral species weakly adsorbed on the surface of AuNP were observed when there were appropriate dipole−dipole interactions at the initial states. Spectral changes were also observed by not only <i>cis</i>-<i>trans</i> photoisomerization of azo-groups but also changes of orientation due to Weigert effect of azo-dyes after linearly polarized UV light irradiation. Spatial features were discussed based on dipole-dipole interactions mainly within an exciton framework.https://www.mdpi.com/2073-8994/11/9/1094chiralityazobenzenephoto-isomerizationWeigert effectSchiff base complexesgold nanoparticlestime-dependent density functional theory (TD-DFT) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nobumitsu Sunaga Tomoyuki Haraguchi Takashiro Akitsu |
spellingShingle |
Nobumitsu Sunaga Tomoyuki Haraguchi Takashiro Akitsu Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation Symmetry chirality azobenzene photo-isomerization Weigert effect Schiff base complexes gold nanoparticles time-dependent density functional theory (TD-DFT) |
author_facet |
Nobumitsu Sunaga Tomoyuki Haraguchi Takashiro Akitsu |
author_sort |
Nobumitsu Sunaga |
title |
Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation |
title_short |
Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation |
title_full |
Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation |
title_fullStr |
Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation |
title_full_unstemmed |
Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation |
title_sort |
orientation of chiral schiff base metal complexes involving azo-groups for induced cd on gold nanoparticles by polarized uv light irradiation |
publisher |
MDPI AG |
series |
Symmetry |
issn |
2073-8994 |
publishDate |
2019-09-01 |
description |
In this study, we report the synthesis, characterization, and chiroptical properties of azo-group-containing chiral salen type Schiff base Ni(II), Cu(II), and Zn(II) complexes absorbed on gold nanoparticles (AuNPs) of 10 nm diameters. Induced circular dichroism (CD) around the plasmon region from the chiral species weakly adsorbed on the surface of AuNP were observed when there were appropriate dipole−dipole interactions at the initial states. Spectral changes were also observed by not only <i>cis</i>-<i>trans</i> photoisomerization of azo-groups but also changes of orientation due to Weigert effect of azo-dyes after linearly polarized UV light irradiation. Spatial features were discussed based on dipole-dipole interactions mainly within an exciton framework. |
topic |
chirality azobenzene photo-isomerization Weigert effect Schiff base complexes gold nanoparticles time-dependent density functional theory (TD-DFT) |
url |
https://www.mdpi.com/2073-8994/11/9/1094 |
work_keys_str_mv |
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