Ultrafast dynamics of an azobenzene-containing molecular shuttle based on a rotaxane

被引：3

作者：

Sartin, Matthew M. ^{[1
,3
]}

Osawa, Masahisa ^{[1
,4
]}

Takeuchi, Satoshi ^{[1
,2
,5
]}

Tahara, Tahei ^{[1
,2
]}

机构：

[1] RIKEN, Mol Spect Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[2] RIKEN, Ultrafast Spect Res Team, Ctr Adv Photon RAP, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[3] Onto Innovat, Bend, OR 97701 USA

[4] Nippon Inst Technol, Dept Appl Chem, 4-1 Gakuendai, Saitama 3458501, Japan

[5] Univ Hyogo, Grad Sch Sci, 3-2-1 Koto, Kamigori, Ako 6781297, Japan

来源：

CHEMICAL COMMUNICATIONS | 2022年 / 58卷 / 07期

关键词：

PHOTOISOMERIZATION DYNAMICS; TRANS-AZOBENZENE; SPECTROSCOPY; FLUORESCENCE; EXCITATION; MECHANISM; WATER;

D O I：

10.1039/d1cc06093g

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An ultrafast spectroscopic study was carried out for a photoisomerizable, rotaxane-based molecular shuttle, in which photoisomerization of the azobenzene moiety of the thread-like guest drives a shuttling motion of a cyclodextrin host. Femtosecond upconversion and time-resolved absorption measurements revealed distinct S-1 dynamics with time constants of 1.2 and 17 ps. Both time constants are smaller when the cyclodextrin host is absent, implying that, within the S-1 state, there are mutiple barriers to the isomerization and subsequent shuttling, due to steric interference from the cyclodextrin.

引用

页码：961 / 964

页数：4

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