Langmuir-Blodgett Films and Chiroptical Switch of an Azobenzene-Containing Dendron Regulated by the in Situ Host-Guest Reaction at the Air/Water Interface

doi:10.1021/la103934g

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	Langmuir-Blodgett Films and Chiroptical Switch of an Azobenzene-Containing Dendron Regulated by the in Situ Host-Guest Reaction at the Air/Water Interface
	Duan, Pengfei; Qin, Long; Liu, Minghua
刊名	LANGMUIR
	2011-02-15
卷号	27 期号:4 页码:1326-1331
ISSN号	0743-7463
DOI	10.1021/la103934g
英文摘要	An amphiphilic dendron containing an azobenzene ring at the focal point and the L-glutamate peripheral groups was designed. Its monolayer formation and host guest reaction with cyclodextrins at the air/water interface and the properties of the transferred Langmuir-Blodgett (LB) films were investigated. The individual dendron, although without any long alkyl chains, could still form a stable monolayer at the air/water interface because of the good balance between hydrophilic and hydrophobic parts within the molecule. When cyclodextrin (CyD) was added to the subphase, a host guest reaction occurred in situ at the air/water interface. The inclusion of the focal azobenzene moiety into the cavity of cyclodextrin decreased the packing of the aromatic ring and also led to the diminishment of the molecular area. Both the films formed at the surface of pure water and aqueous cyclodextrins were transferred onto solid substrates. Nanofiber structures were obtained for the film from the water surface as a result of the packing of the azobenzene groups, and circular domains were obtained for the film transferred from the aqueous CyD phases. The film transferred from the water surface showed an exciton couplet in the absorption band of azobenzene, whereas a negative Cotton effect was obtained for the film from CyD subphases. It was found that the supramolecular chirality in the LB film transferred from water was due to the transfer of the molecular chirality to the assemblies whereas that from the CyD subphase was due to the inclusion of azobenzene into the chiral cavity. Interestingly, the film from the water surface was photoinactive, whereas a reversible optical and chiroptical switch could be obtained for the film from the alpha-CyD subphase. The work provided a way to regulate the assembly and functions of organized molecular films by taking advantage of the interfacial host guest reaction.
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000287048900014
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/71375]
专题	中国科学院化学研究所
通讯作者	Liu, Minghua
作者单位	CAS, BNLMS, Key Lab Colloid & Interface Sci, Inst Chem, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Duan, Pengfei,Qin, Long,Liu, Minghua. Langmuir-Blodgett Films and Chiroptical Switch of an Azobenzene-Containing Dendron Regulated by the in Situ Host-Guest Reaction at the Air/Water Interface[J]. LANGMUIR,2011,27(4):1326-1331.
APA	Duan, Pengfei,Qin, Long,&Liu, Minghua.(2011).Langmuir-Blodgett Films and Chiroptical Switch of an Azobenzene-Containing Dendron Regulated by the in Situ Host-Guest Reaction at the Air/Water Interface.LANGMUIR,27(4),1326-1331.
MLA	Duan, Pengfei,et al."Langmuir-Blodgett Films and Chiroptical Switch of an Azobenzene-Containing Dendron Regulated by the in Situ Host-Guest Reaction at the Air/Water Interface".LANGMUIR 27.4(2011):1326-1331.