Photoisomerization of Azobenzene Derivatives in Nanostructured Silica
详细信息 查看全文
- 作者：Paul Sierocki ; Huub Maas ; Patrick Dragut ; Gabriele Richardt ; Fritz Vö ; gtle ; Luisa De Cola ; Fred (A. M.) Brouwer ; Jeffrey I. Zink
- 刊名：Journal of Physical Chemistry B
- 出版年：2006
- 出版时间：December 7, 2006
- 年：2006
- 卷：110
- 期：48
- 页码：24390 - 24398
- 全文大小：210K
- 年卷期：v.110,no.48(December 7, 2006)
- ISSN：1520-5207
文摘
A series of derivatized azobenzene molecules are synthesized such that one of the phenyl groups can bechemically bonded to mesostructured silica and the other, derivatized with dendrons, is free to undergo large-amplitude light-driven motion. The silica frameworks on which the motion takes place are either 150 nmthick films containing ordered hexagonal arrays of tubes (inner diameter about 2 nm) containing the bondedazobenzenes, or particles (about 500 nm in diameter) containing the same ordered arrays of functionalizedtubes. The photoisomerization yields and the rate constants for the thermal cis to trans back-reaction of theazobenzenes in the tubes are measured and compared to those of the molecules in solution. The rate constantsdecrease with increasing size of the dendrons. Fluorescence spectra of the cis and trans isomers in the poresshow that the photoisomerization in the nanostructured materials is selectively driven by specific wavelengthsof light and is reversible.