Long-distance electron transport

Cytochromes Redox Cofactors Involved in Biofilm Long-Distance Electron Transport... 

Long-Distance Electron Transport by Sequential Short-Distance Electron Transfer Reactions Is a Diffusive Process... 

In the absence of dynamic and static disorder, all partially filled band systems would exhibit coherent transport over long distances. With static and dynamic disorder, the modulation of the simple molecular orbital or band structure by nuclear effects entirely dominates transport. This is clear both in the Kubo linear response formulation of conductivity and in the Marcus-Hush-Jortner formulation of ET rates. The DNA systems are remarkable for the different kinds of disorder they exhibit in addition to the ordinary static and dynamic disorder expected in any soft material, DNA has the covalent disorder arising from the choice of A, T, G, or C at each substitution base site along the backbone. Additionally, DNA has the characteristic orientational and metric (helicoidal) disorder parameters arising from the fundamental motif of electron motion along the r-stack. 

An X-ray photoelectron spectroscopic study of Ni(DPG)2I showed no evidence of trapped valence or any appreciable change in the charge on the metal upon oxidation.97 The site of partial oxidation and hence the electron transport mechanism is still unclear but one explanation of the relatively low conductivity is that the conduction pathway is metal centred and that the M—M distances are too long for effective orbital overlap. Electron transport could be via a phonon-assisted hopping mechanism or, in the Epstein—Conwell description, involve weakly localized electronic states, a band gap (2A) and an activated carrier concentration.101... 

Kanvah S, Schuster GB (2004) One-electron oxidation of DNA the effect of replacement of cytosine with 5-methylcytosine on long-distance radical cation transport and reaction. J Am Chem Soc... 

Ruthenium, osmium, and rheitium complexes have been used to define electron-transfer rates over defined distances and pathways see Iron Heme Proteins Electron Transport, Long-range Electron Transfer in Biology) They can be attached to external His residues by displacement of its... 

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