抄録
In this article, we describe the synthesis and photoreactions of photocrosslinkable dendrimers bearing trans-cinnamoyl residues at the peripheral positions. Photoirradiation of the dendrimers with 313 nm gave rise to monotonous decrease in the absorbance of trans-cinnamates at 270 nm as a result of their photochemical reactions involving trans-to-cis photoisomerization and [2+2] photodimerization. The first-generation dendrimer displayed the preferential formation of cis-cinnamates at the photostationary state, whereas the photodimerization took place favorably for the third- and fifth-generation dendrimers. The photodimerized rate was strongly dependent on the dendritic generation rather than the concentration of solutions, probably due to the extent of steric crowding among the cinnamates settled on the dendritic surfaces. The third- and fifth-generation dendrimers enabled the capturing of a phosphorescent sensitizer into the internal dendritic cavities to generate the effective photocrosslinking of the cinnamates in an intramacromolecular manner through triplet energy transfer from the excited sensitizer. The photocrosslinking reaction of dendrimers through the triplet energy transfer might provide potential applicabilities to design and fabricate novel optical and electrical molecular devices from the bottom-up approach.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 85-89 |
| ページ数 | 5 |
| ジャーナル | Thin Solid Films |
| 巻 | 438-439 |
| DOI | |
| 出版物ステータス | 出版済み - 8 22 2003 |
| イベント | The 5th International Conference on Nano-Molecular Electronics - Kobe, 日本 継続期間: 12 10 2002 → 12 12 2002 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry
これを引用
Effective photocrosslinking reaction of dendrimers through triplet energy transfer. / Furumi, Seiichi; Otomo, Akira; Yokoyama, Shiyoshi; Mashiko, Shinro.
：: Thin Solid Films, 巻 438-439, 22.08.2003, p. 85-89.研究成果: ジャーナルへの寄稿 › Conference article
}
TY - JOUR
T1 - Effective photocrosslinking reaction of dendrimers through triplet energy transfer
AU - Furumi, Seiichi
AU - Otomo, Akira
AU - Yokoyama, Shiyoshi
AU - Mashiko, Shinro
PY - 2003/8/22
Y1 - 2003/8/22
N2 - In this article, we describe the synthesis and photoreactions of photocrosslinkable dendrimers bearing trans-cinnamoyl residues at the peripheral positions. Photoirradiation of the dendrimers with 313 nm gave rise to monotonous decrease in the absorbance of trans-cinnamates at 270 nm as a result of their photochemical reactions involving trans-to-cis photoisomerization and [2+2] photodimerization. The first-generation dendrimer displayed the preferential formation of cis-cinnamates at the photostationary state, whereas the photodimerization took place favorably for the third- and fifth-generation dendrimers. The photodimerized rate was strongly dependent on the dendritic generation rather than the concentration of solutions, probably due to the extent of steric crowding among the cinnamates settled on the dendritic surfaces. The third- and fifth-generation dendrimers enabled the capturing of a phosphorescent sensitizer into the internal dendritic cavities to generate the effective photocrosslinking of the cinnamates in an intramacromolecular manner through triplet energy transfer from the excited sensitizer. The photocrosslinking reaction of dendrimers through the triplet energy transfer might provide potential applicabilities to design and fabricate novel optical and electrical molecular devices from the bottom-up approach.
AB - In this article, we describe the synthesis and photoreactions of photocrosslinkable dendrimers bearing trans-cinnamoyl residues at the peripheral positions. Photoirradiation of the dendrimers with 313 nm gave rise to monotonous decrease in the absorbance of trans-cinnamates at 270 nm as a result of their photochemical reactions involving trans-to-cis photoisomerization and [2+2] photodimerization. The first-generation dendrimer displayed the preferential formation of cis-cinnamates at the photostationary state, whereas the photodimerization took place favorably for the third- and fifth-generation dendrimers. The photodimerized rate was strongly dependent on the dendritic generation rather than the concentration of solutions, probably due to the extent of steric crowding among the cinnamates settled on the dendritic surfaces. The third- and fifth-generation dendrimers enabled the capturing of a phosphorescent sensitizer into the internal dendritic cavities to generate the effective photocrosslinking of the cinnamates in an intramacromolecular manner through triplet energy transfer from the excited sensitizer. The photocrosslinking reaction of dendrimers through the triplet energy transfer might provide potential applicabilities to design and fabricate novel optical and electrical molecular devices from the bottom-up approach.
UR - http://www.scopus.com/inward/record.url?scp=14844340102&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=14844340102&partnerID=8YFLogxK
U2 - 10.1016/S0040-6090(03)00771-5
DO - 10.1016/S0040-6090(03)00771-5
M3 - Conference article
AN - SCOPUS:14844340102
VL - 438-439
SP - 85
EP - 89
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
ER -