Electrochemistry of cis-azobenzene chromophore in coulombically linked   self-assembled monolayer-Langmuir-Blodgett composite monolayers

doi:10.1021/jp9536615

CORC > 北京大学 > 化学与分子工程学院

	Electrochemistry of cis-azobenzene chromophore in coulombically linked self-assembled monolayer-Langmuir-Blodgett composite monolayers
	Liu, ZF ; Zhao, CX ; Tang, M ; Cai, SM
刊名	journal of physical chemistry
	1996
关键词	SURFACE-CONFINED MONOLAYERS PHASE PROBE MOLECULES AZO COMPOUND STRUCTURAL CHARACTERIZATION LIQUID-CRYSTAL FATTY-ACIDS FILM GOLD SPECTROSCOPY TRANS
DOI	10.1021/jp9536615
英文摘要	A SAM-LB composite film containing azobenzene chromophore was fabricated on gold by combining the self-assembled monolayer (SAM) technique and the Langmuir-Blodgett (LB) technique. Reflection absorption FTIR studies indicate that the composite film has an ionic bonding character at the SAM-LB interface, which has greatly improved the film stability and effectively prevented the destructive intermolecular aggregation, as evidenced by atomic force microscopy observations. The relatively loose packing structure provides enough free volume to undergo a reversible trans-cis photoisomerization and thus enabled us to perform the electrochemical studies of the cis-azobenzene redox group in such organized monolayer assemblies. The cis-azobenzene SAM-LB composite film shows a stable and clearcut Faradaic response within the pH range 3.0-9.0, attributable to the 2e(-) and 2H(+) electrochemical reduction-oxidation of cis-azobenzene/hydrazobenzene. Comparing with the trans-azobenzene composite film, the LB films deposited on SnO2, and the azobenzene-functionalized thiolate SAMs on gold, its reaction kinetics is more reversible as seen from the larger electron-transfer rate constant, smaller peak-to-peak splitting, and smaller half-peak width. The logarithmic rate constant shows a complicated but unique pH dependence, characteristic of azobenzene redox kinetics, which is explained by the varied sequences of electron transfers and protonations in different pH ranges.; Chemistry, Physical; SCI(E); 0; ARTICLE; 43; 17337-17344; 100
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/151701]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	Liu, ZF,Zhao, CX,Tang, M,et al. Electrochemistry of cis-azobenzene chromophore in coulombically linked self-assembled monolayer-Langmuir-Blodgett composite monolayers[J]. journal of physical chemistry,1996.
APA	Liu, ZF,Zhao, CX,Tang, M,&Cai, SM.(1996).Electrochemistry of cis-azobenzene chromophore in coulombically linked self-assembled monolayer-Langmuir-Blodgett composite monolayers.journal of physical chemistry.
MLA	Liu, ZF,et al."Electrochemistry of cis-azobenzene chromophore in coulombically linked self-assembled monolayer-Langmuir-Blodgett composite monolayers".journal of physical chemistry (1996).