Photoelectrochemical Behavior of Azobenzene Self-assembled Monolayers on Gold

Abstract

Abstract: A novel azobenzene derivative was synthesized and self-assembled into monlayer on gold.The photochromic and electrochemical behavior of thus formed azobenzene SAMs were studied by investigating the different redox properties before or/and after irradiating the film with 350 nm UVlight.In the large scan range(-0.6～+0.5 V),clear-cut electrochemical response of trans-azobenzene/hydrazobenzene was obtained in B-Rbuffer (0.1mol/L NaClO₄, pH:2 ), while no discernible faradic response can be observed in a small scan range(-0.3～+0.5 V).However, after 5 min irradiation of UVlight , redox peaks corresponding to cis-azobenzene/hydrazobenzene raised up in the cyclic voltammograrn.Itshould be noted that:(1)The conversion ratio of trans/cis isomerization is very low in thehishly-organized monolayers due to the inhibition of rigid SAMs' structure.(2) The cis-azobenzene is much easier to be reduced than transform, enable the unique"one way hybrid photoelectrochemical cycle" to be available in SAMs as we obtained previously in LB monolayer.

Key words: Azobenzen, Self-assembled, monolayer, Photochromism, Electrochemistry

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WANG Yong-Qiang, WANG Jian, YU Hua-Zhong, CAI Sheng-Min, LIU Zhong-Fan. Photoelectrochemical Behavior of Azobenzene Self-assembled Monolayers on Gold[J]. Chem. J. Chinese Universities, 1996, 17(7): 1130.

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Photoelectrochemical Behavior of Azobenzene Self-assembled Monolayers on Gold

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