Orientation of chiral Schiff base metal complexes involving azo-groups for induced CD on gold nanoparticles by polarized UV light irradiation

Nobumitsu Sunaga; Tomoyuki Haraguchi; Takashiro Akitsu

doi:10.3390/sym11091094

Orientation of chiral Schiff base metal complexes involving azo-groups for induced CD on gold nanoparticles by polarized UV light irradiation

Nobumitsu Sunaga, Tomoyuki Haraguchi, Takashiro Akitsu

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

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 cis-trans 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.

Original language	English
Article number	1094
Journal	Symmetry
Volume	11
Issue number	9
DOIs	https://doi.org/10.3390/sym11091094
Publication status	Published - 2019

Keywords

Azobenzene
Chirality
Gold nanoparticles
Photo-isomerization
Schiff base complexes
Time-dependent density functional theory (TD-DFT)
Weigert effect

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10.3390/sym11091094

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@article{42600b61efb1485c8cbf0ac04f081191,

title = "Orientation of chiral Schiff base metal complexes involving azo-groups for induced CD on gold nanoparticles by polarized UV light irradiation",

abstract = "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 cis-trans 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.",

keywords = "Azobenzene, Chirality, Gold nanoparticles, Photo-isomerization, Schiff base complexes, Time-dependent density functional theory (TD-DFT), Weigert effect",

author = "Nobumitsu Sunaga and Tomoyuki Haraguchi and Takashiro Akitsu",

note = "Funding Information: This research received no external funding. The authors thank Yuki Tsutsumi and Ikuma Jahana (students in our groups) for their assistance in performing some experiments. Publisher Copyright: {\textcopyright} 2019 by the authors.",

year = "2019",

doi = "10.3390/sym11091094",

language = "English",

volume = "11",

journal = "Symmetry",

issn = "2073-8994",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "9",

}

TY - JOUR

T1 - Orientation of chiral Schiff base metal complexes involving azo-groups for induced CD on gold nanoparticles by polarized UV light irradiation

AU - Sunaga, Nobumitsu

AU - Haraguchi, Tomoyuki

AU - Akitsu, Takashiro

N1 - Funding Information: This research received no external funding. The authors thank Yuki Tsutsumi and Ikuma Jahana (students in our groups) for their assistance in performing some experiments. Publisher Copyright: © 2019 by the authors.

PY - 2019

Y1 - 2019

N2 - 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 cis-trans 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.

AB - 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 cis-trans 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.

KW - Azobenzene

KW - Chirality

KW - Gold nanoparticles

KW - Photo-isomerization

KW - Schiff base complexes

KW - Time-dependent density functional theory (TD-DFT)

KW - Weigert effect

UR - https://www.scopus.com/pages/publications/85071912261

U2 - 10.3390/sym11091094

DO - 10.3390/sym11091094

M3 - Article

AN - SCOPUS:85071912261

SN - 2073-8994

VL - 11

JO - Symmetry

JF - Symmetry

IS - 9

M1 - 1094

ER -

Orientation of chiral Schiff base metal complexes involving azo-groups for induced CD on gold nanoparticles by polarized UV light irradiation

Abstract

Keywords

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