Hence waste disposal is kept minimal in these

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Unformatted text preview: etic protocols, efficient, elegant, expedient, economic and convergent. Consequently, synthesis involving domino reactions is increasingly preferred to construct complex molecules. Domino reactions are usually serendipitous, alth ough now more and more target-oriented syntheses involving tandem reactions are reported in literature. In this lecture, a few examples from literature and from the author’s research group on the use of domino reactions in building up of some interesting structures will be discussed. 58 3rd ICYC 2010 Universiti Sains Malaysia KN-20 23rd-25th June 2010 FLUORESCENCE RESONANCE ENERGY TRANSFER TO NANOPARTICLES, GRAPHENE AND CARBON NANOTUBES R.S. Swathi and K. L. Sebastian Department of Inorganic and Physical Chemistry, Indian Institut e of Science, Bangalore 560012, India E-mail: kls@ipc.iisc.ernet.in We study the process of resonance energy transfer from fluorescent dye molecules that serve as energy donors to three types of energy acceptors namely, a metal nanoparticle, a graphene sh eet and carbon nanotubes. In all the cases, we evaluate the rate of energy transfer and study its dependence on the distance between the donor and the acceptor. For the case of energy transfer from the dye fluorescein -6 to a 1.4 nm diameter gold nanoparticle, we find that the rate follows the usual Forster type R distance -n dependence at large distances. But, at short distances, the rate follows a R dependence with n>6. This is attributed to the effect of quadrupolar and octupolar modes of excitation of t he nanoparticle. For the -4 case of energy transfer from the dye pyrene to graphene, we obtain a z dependence of the rate on the distance. Our analysis implies that for the case of pyrene kept at a distance z above the plane of graphene, fluorescence quenching can be experimentally observed up to a distance of 300 Å, which is quite large in comparison with the traditional FRET limit (100 Å). Recent experiments have in fact observed fluorescence quenching of dyes near grap...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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