Journal ArticleDOI
Long-range photoinduced electron transfer through a DNA helix
Catherine J. Murphy,Michelle R. Arkin,Yonchu Jenkins,Naresh D. Ghatlia,Stefan H. Bossmann,Nicholas J. Turro,Jacqueline K. Barton +6 more
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TLDR
The stacked aromatic heterocycles of the DNA duplex therefore serve as an efficient medium for coupling electron donors and acceptors over very long distances.Abstract:
Rapid photoinduced electron transfer is demonstrated over a distance of greater than 40 angstroms between metallointercalators that are tethered to the 5' termini of a 15-base pair DNA duplex. An oligomeric assembly was synthesized in which the donor is Ru(phen)2dppz2+ (phen, phenanthroline, and dppz, dipyridophenazine) and the acceptor is Rh(phi)2phen3+ (phi, phenanthrenequinone diimine). These metal complexes are intercalated either one or two base steps in from the helix termini. Although the ruthenium-modified oligonucleotide hybridized to an unmodified complement luminesces intensely, the ruthenium-modified oligomer hybridized to the rhodium-modified oligomer shows no detectable luminescence. Time-resolved studies point to a lower limit of 10(9) per second for the quenching rate. No quenching was observed upon metallation of two complementary octamers by Ru(phen)3(2+) and Rh(phen)3(3+) under conditions where the phen complexes do not intercalate. The stacked aromatic heterocycles of the DNA duplex therefore serve as an efficient medium for coupling electron donors and acceptors over very long distances.read more
Citations
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Signaling Recognition Events with Fluorescent Sensors and Switches.
A. Prasanna de Silva,H. Q. Nimal Gunaratne,Thorfinnur Gunnlaugsson,Allen J. M. Huxley,Colin P. McCoy,Jude T. Rademacher,Terence E. Rice +6 more
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Fluorescence Lifetime Measurements and Biological Imaging
TL;DR: The lifetime of a photophysical process is the time required by a population of N electronically excited molecules to be reduced by a factor of e via the loss of energy through fluorescence and other non-radiative processes and the average length of time τ is called the mean lifetime, or simply lifetime.
Journal ArticleDOI
Contemporary Issues in Electron Transfer Research
TL;DR: In this paper, a qualitative discussion of electron transfer, its time and distance scales, energy curves, and basic parabolic energy models are introduced to define the electron transfer process, and some of the important, challenging, and problematic issues in contemporary electron transfer research are discussed.
Journal ArticleDOI
Probing Electrical Transport in Nanomaterials: Conductivity of Individual Carbon Nanotubes
TL;DR: In this article, a force microscope equipped with a conducting probe tip has been used to map simultaneously the structure and resistance of the portion of the material protruding from the macroscopic contact.
Journal ArticleDOI
Charge Transfer on the Nanoscale: Current Status
David M. Adams,Louis E. Brus,Christopher E. D. Chidsey,Stephen E. Creager,Carol Creutz,Cherie R. Kagan,Prashant V. Kamat,X Marya Lieberman,O Stuart Lindsay,Rudolph A. Marcus,Robert M. Metzger,Maria-Elisabeth Michel-Beyerle,John R. Miller,Marshall D. Newton,Debra R. Rolison,Otto F. Sankey,Kirk S. Schanze,James T. Yardley,Xiaoyang Zhu +18 more
TL;DR: The current status of basic electron transfer research, both theoretical and experimental, with emphasis on the distance-dependent measurements, was discussed in this article, where the authors attempted to integrate terminology and notation of solution electron-transfer kinetics with that of conductance analysis.
References
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Journal ArticleDOI
Electron transfers in chemistry and biology
Rudolph A. Marcus,Norman Sutin +1 more
TL;DR: In this paper, the electron transfer reactions between ions and molecules in solution have been the subject of considerable experimental study during the past three decades, including charge transfer, photoelectric emission spectra, chemiluminescent electron transfer, and electron transfer through frozen media.
Journal ArticleDOI
Chemical and Electrochemical Electron-Transfer Theory
TL;DR: In this article, a review of electron transfer reactions is presented, focusing on the absence of bond rupture in the reaction step, which is a unique feature of purely electron-transfer reactions.
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Photoinduced electron transfer in supramolecular systems for artificial photosynthesis
Journal ArticleDOI
Nature of biological electron transfer
TL;DR: Powerful first-order analysis of intraprotein electron transfer is developed from electron-transfer measurements both in biological and in chemical systems, finding selection of distance, free energy and reorganization energy are sufficient to define rate and directional specificity of biological electron transfer.
Journal ArticleDOI
Molecular light switch for DNA : Ru(bpy)2(dppz)2+
Alan E. Friedman,Jean Claude Chambron,Jean-Pierre Sauvage,Nicholas J. Turro,Jacqueline K. Barton +4 more
TL;DR: In this article, a transition-metal complex was used as a molecular light switch for double-helical DNA, which showed no photoluminescence in aqueous solution at ambient temperatures.