Solution phase electron transfer versus bridge mediated electron transfer across carboxylic acid terminated thiols

被引:11
作者
Berchmans, S
Nirmal, RG
Prabaharan, G
Mishra, AK
Yegnaraman, V [1 ]
机构
[1] Cent Electrochem Res Inst, Karaikkudi 630006, Tamil Nadu, India
[2] Inst Math Sci, Madras 600113, Tamil Nadu, India
关键词
self-assembled monolayers (SAM); functionalised thiols; redox systems; electron transfer kinetics; electron tunnelling;
D O I
10.1007/s10008-005-0011-0
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Self-assembled monolayers (SAMs) of thiols with carboxylic acid terminal groups were formed on gold substrates. The electron transfer characteristics of redox species on the above SAM-modified electrodes were studied in acid and neutral media with the help of voltammetry under two different conditions: (1) solution phase electron transfer and (2) bridge mediated electron transfer. Two redox systems, viz., [Fe(CN)(6)](4-/3-) and Ru[(NH3)(6)](2+/3+) were chosen for the solution phase study. Investigations of bridge mediated electron transfer were carried out by functionalising the SAM with redox moieties and then studying their redox behaviour. For this study, ferrocene carboxylic acid and 1,4-diamino anthraquinone were used and they were linked to carboxylic acid terminated thiols by covalent linkage. The voltammetric results with mercaptoundecanoic acid SAM demonstrate the difference in behaviour between solution phase and bridge mediated electron transfer processes.
引用
收藏
页码:439 / 446
页数:8
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