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Citation: Shao Hui-Bo, Yu Hua-Zhong, Zhang Hao-Li, Luo Ying, Cheng Guang-Jun, Liu Zhong-Fan. State of the Tunneling Mechanism for Long Range Electron Transfer in Azobenzene Self-assembled Monolayers[J]. Acta Physico-Chimica Sinica, ;1998, 14(09): 772-777. doi: 10.3866/PKU.WHXB19980902 shu

State of the Tunneling Mechanism for Long Range Electron Transfer in Azobenzene Self-assembled Monolayers

1.
Center for Intelligent Materials Research(CIMR),College of Chemistry and Molecular Engineering,Peking University,Beijing 100871

Received Date: 13 June 1997
Available Online: 15 September 1998

The tunneling mechanism for long range electron transfer in azobenzene self-assembled mololayers on ld has been studied by electrochemical techniques. We have prepared for the first time a series of azobenzene-tethered alkanethiol monolayers on ld electrode surface with varied number of methylenes in the alkyl chain spacer (CH3CH2-4-?-N=N-?-C(O)NH (CH2)nSH/Au, n=2, 3, 4, 6). The apparent electron transfer rate constants kapp of azobenzcne to the underlying electrode are found to fall off exponentially with increasing the length of alkyl chain spacers. Theelectron tunneling constant βfor the electron transfer in the present system are estimated to be 1.35±0.20 per CH2 from the logarithmic kapp. versus n (number of methylenes in the alkyl chain spacer) plot.
- Azobenzene,
- Self-assembled monolayers(SAMs),
- Electron tunneling constant
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