Synthesis of ordered photoresponsive azobenzene-siloxane hybrids by self-assembly

Sufang Guo, Ayae Sugawara-Narutaki, Tatsuya Okubo, Atsushi Shimojima

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

In this study, photoresponsive azobenzene-siloxane hybrids with lamellar structures were prepared by self-assembly using two types of alkoxysilane precursors, 4-[3-(triethoxysilyl)propoxy]azobenzene (P1) and 4-[3-(diethoxymethylsilyl)propoxy]azobenzene (P2). The films H1 and H2 were prepared by spin-coating hydrolyzed solutions of P1 and P2, respectively, on a glass substrate followed by heating to induce polycondensation. X-ray diffraction patterns revealed that H1 and H2 have lamellar structures with different d-spacings (3.20 nm and 2.37 nm, respectively), suggesting that the arrangements of the azobenzene moieties are different. These samples show slight but reversible changes in the d-spacings under photo-irradiation. Under UV irradiation, H1 shows a slight decrease in d-spacing, while H2 shows a slight increase. Such changes were caused by trans-cis isomerization of a part of the azobenzene moieties in the films, as confirmed by UV-vis absorption spectroscopy. These processes were reversible, with the d-spacings recovering their original values under visible light irradiation. Furthermore, P1 and P2 were co-hydrolyzed and polycondensed with tetraethoxysilane to give lamellar films (H1′ and H2′) showing a higher degree of trans-cis photoisomerization of the azobenzene moieties. Both H1′ and H2′ show increase in the d-spacings after soaking in various organic solvents. Possible structural models have been proposed to explain these photoresponsive properties of the azobenzene-siloxane nanohybrids, which will find potential applications as smart sensors and adsorbents in future. This journal is

Original languageEnglish
Pages (from-to)6989-6995
Number of pages7
JournalJournal of Materials Chemistry C
Volume1
Issue number42
DOIs
Publication statusPublished - 2013 Nov 14
Externally publishedYes

Fingerprint

Siloxanes
Azobenzene
Self assembly
Lamellar structures
Irradiation
Photoisomerization
Smart sensors
Spin coating
Polycondensation
Isomerization
azobenzene
Ultraviolet spectroscopy
Absorption spectroscopy
Organic solvents
Adsorbents
Diffraction patterns
Heating
X ray diffraction
Glass
Polymers

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

Cite this

Synthesis of ordered photoresponsive azobenzene-siloxane hybrids by self-assembly. / Guo, Sufang; Sugawara-Narutaki, Ayae; Okubo, Tatsuya; Shimojima, Atsushi.

In: Journal of Materials Chemistry C, Vol. 1, No. 42, 14.11.2013, p. 6989-6995.

Research output: Contribution to journalArticle

Guo, Sufang ; Sugawara-Narutaki, Ayae ; Okubo, Tatsuya ; Shimojima, Atsushi. / Synthesis of ordered photoresponsive azobenzene-siloxane hybrids by self-assembly. In: Journal of Materials Chemistry C. 2013 ; Vol. 1, No. 42. pp. 6989-6995.
@article{b08e5a2afadb4a83a10cb66b82bd4425,
title = "Synthesis of ordered photoresponsive azobenzene-siloxane hybrids by self-assembly",
abstract = "In this study, photoresponsive azobenzene-siloxane hybrids with lamellar structures were prepared by self-assembly using two types of alkoxysilane precursors, 4-[3-(triethoxysilyl)propoxy]azobenzene (P1) and 4-[3-(diethoxymethylsilyl)propoxy]azobenzene (P2). The films H1 and H2 were prepared by spin-coating hydrolyzed solutions of P1 and P2, respectively, on a glass substrate followed by heating to induce polycondensation. X-ray diffraction patterns revealed that H1 and H2 have lamellar structures with different d-spacings (3.20 nm and 2.37 nm, respectively), suggesting that the arrangements of the azobenzene moieties are different. These samples show slight but reversible changes in the d-spacings under photo-irradiation. Under UV irradiation, H1 shows a slight decrease in d-spacing, while H2 shows a slight increase. Such changes were caused by trans-cis isomerization of a part of the azobenzene moieties in the films, as confirmed by UV-vis absorption spectroscopy. These processes were reversible, with the d-spacings recovering their original values under visible light irradiation. Furthermore, P1 and P2 were co-hydrolyzed and polycondensed with tetraethoxysilane to give lamellar films (H1′ and H2′) showing a higher degree of trans-cis photoisomerization of the azobenzene moieties. Both H1′ and H2′ show increase in the d-spacings after soaking in various organic solvents. Possible structural models have been proposed to explain these photoresponsive properties of the azobenzene-siloxane nanohybrids, which will find potential applications as smart sensors and adsorbents in future. This journal is",
author = "Sufang Guo and Ayae Sugawara-Narutaki and Tatsuya Okubo and Atsushi Shimojima",
year = "2013",
month = "11",
day = "14",
doi = "10.1039/c3tc30587b",
language = "English",
volume = "1",
pages = "6989--6995",
journal = "Journal of Materials Chemistry C",
issn = "2050-7526",
publisher = "Royal Society of Chemistry",
number = "42",

}

TY - JOUR

T1 - Synthesis of ordered photoresponsive azobenzene-siloxane hybrids by self-assembly

AU - Guo, Sufang

AU - Sugawara-Narutaki, Ayae

AU - Okubo, Tatsuya

AU - Shimojima, Atsushi

PY - 2013/11/14

Y1 - 2013/11/14

N2 - In this study, photoresponsive azobenzene-siloxane hybrids with lamellar structures were prepared by self-assembly using two types of alkoxysilane precursors, 4-[3-(triethoxysilyl)propoxy]azobenzene (P1) and 4-[3-(diethoxymethylsilyl)propoxy]azobenzene (P2). The films H1 and H2 were prepared by spin-coating hydrolyzed solutions of P1 and P2, respectively, on a glass substrate followed by heating to induce polycondensation. X-ray diffraction patterns revealed that H1 and H2 have lamellar structures with different d-spacings (3.20 nm and 2.37 nm, respectively), suggesting that the arrangements of the azobenzene moieties are different. These samples show slight but reversible changes in the d-spacings under photo-irradiation. Under UV irradiation, H1 shows a slight decrease in d-spacing, while H2 shows a slight increase. Such changes were caused by trans-cis isomerization of a part of the azobenzene moieties in the films, as confirmed by UV-vis absorption spectroscopy. These processes were reversible, with the d-spacings recovering their original values under visible light irradiation. Furthermore, P1 and P2 were co-hydrolyzed and polycondensed with tetraethoxysilane to give lamellar films (H1′ and H2′) showing a higher degree of trans-cis photoisomerization of the azobenzene moieties. Both H1′ and H2′ show increase in the d-spacings after soaking in various organic solvents. Possible structural models have been proposed to explain these photoresponsive properties of the azobenzene-siloxane nanohybrids, which will find potential applications as smart sensors and adsorbents in future. This journal is

AB - In this study, photoresponsive azobenzene-siloxane hybrids with lamellar structures were prepared by self-assembly using two types of alkoxysilane precursors, 4-[3-(triethoxysilyl)propoxy]azobenzene (P1) and 4-[3-(diethoxymethylsilyl)propoxy]azobenzene (P2). The films H1 and H2 were prepared by spin-coating hydrolyzed solutions of P1 and P2, respectively, on a glass substrate followed by heating to induce polycondensation. X-ray diffraction patterns revealed that H1 and H2 have lamellar structures with different d-spacings (3.20 nm and 2.37 nm, respectively), suggesting that the arrangements of the azobenzene moieties are different. These samples show slight but reversible changes in the d-spacings under photo-irradiation. Under UV irradiation, H1 shows a slight decrease in d-spacing, while H2 shows a slight increase. Such changes were caused by trans-cis isomerization of a part of the azobenzene moieties in the films, as confirmed by UV-vis absorption spectroscopy. These processes were reversible, with the d-spacings recovering their original values under visible light irradiation. Furthermore, P1 and P2 were co-hydrolyzed and polycondensed with tetraethoxysilane to give lamellar films (H1′ and H2′) showing a higher degree of trans-cis photoisomerization of the azobenzene moieties. Both H1′ and H2′ show increase in the d-spacings after soaking in various organic solvents. Possible structural models have been proposed to explain these photoresponsive properties of the azobenzene-siloxane nanohybrids, which will find potential applications as smart sensors and adsorbents in future. This journal is

UR - http://www.scopus.com/inward/record.url?scp=84885450994&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84885450994&partnerID=8YFLogxK

U2 - 10.1039/c3tc30587b

DO - 10.1039/c3tc30587b

M3 - Article

VL - 1

SP - 6989

EP - 6995

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

SN - 2050-7526

IS - 42

ER -