Electron transfer through H-bonded peptide assemblies
Journal of Physical Chemistry B, ISSN: 1520-6106, Vol: 108, Issue: 52, Page: 20164-20172
2004
- 58Citations
- 37Captures
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Article Description
A series of ferrocene (Fc)- and cystamine (CSA)-labeled peptides of the sequence [Fc-(Pro-Pro-Gly)-CSA], where n = 1-3, was synthesized and characterized. Peptide 3 forms a trimeric supramolecular structure held together with extensive hydrogen bonding and adopts a collagen-like motif in solution. Cyclic voltammetry (CV) and chronoamperometry (CA) were used to calculate electron-transfer (ET) kinetics. ET rates were 10.9 (2.3)×10, 6.6 (1.9)×10, and 4.2 (1.2)×10 s for peptides where n = 1, 2, and 3, respectively. The peptides, under deuterated conditions (DO, full exchange of H for D), showed rate constants of 7.3 (1.3)×10, 5.8 (1.0) ×10, and 3.4 (0.5)×10 s for n = 1, 2, and 3, respectively. A linear dependence of the ET rate constant and distance is found.
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