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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Main Authors:	Nobumitsu Sunaga, Tomoyuki Haraguchi, Takashiro Akitsu
Format:	Article
Language:	English
Published:	MDPI AG 2019-09-01
Series:	Symmetry
Subjects:	chirality azobenzene photo-isomerization Weigert effect Schiff base complexes gold nanoparticles time-dependent density functional theory (TD-DFT)
Online Access:	https://www.mdpi.com/2073-8994/11/9/1094

id	doaj-3644031d0b8f480fb421496d16dc0f71
record_format	Article
spelling	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	AT nobumitsusunaga orientationofchiralschiffbasemetalcomplexesinvolvingazogroupsforinducedcdongoldnanoparticlesbypolarizeduvlightirradiation AT tomoyukiharaguchi orientationofchiralschiffbasemetalcomplexesinvolvingazogroupsforinducedcdongoldnanoparticlesbypolarizeduvlightirradiation AT takashiroakitsu orientationofchiralschiffbasemetalcomplexesinvolvingazogroupsforinducedcdongoldnanoparticlesbypolarizeduvlightirradiation
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Orientation of Chiral Schiff Base Metal Complexes Involving Azo-Groups for Induced CD on Gold Nanoparticles by Polarized UV Light Irradiation

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