By Alaa S. Abd-El-Aziz, Charles E. Carraher, Pierre D. Harvey, Charles U. Pittman, Martel Zeldin

Steel- and metalloid-containing macromolecules are outlined as huge molecules (i.e., polymers, DNA, proteins) that include a steel or metalloid crew affiliated with the molecule. This quantity describes what's attainable with metal-containing polymers the place the steel is a necessary aspect in acquiring wanted optical and digital houses. masking functions in nonlinear optical fabrics, sun cells, light-emitting diodes, photovoltaic cells, field-effect transistors, chemosensing units, and biosensing units, this indispensible advisor makes a speciality of the photochemistry and photophysics of metal-containing polymers, with chapters by means of top participants to the middle advances during this box.

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Additional info for Macromolecules Containing Metal and Metal-Like Elements, Photophysics and Photochemistry of Metal-Containing Polymers (Volume 10)

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16 Although the double electron exchange is involved in this mechanism, no charge separated-state is formed. The Dexter mechanism can be thought of as electron tunneling, by which one electron from the donor’s LUMO moves to the acceptor’s LUMO at the same time as an electron from the acceptor’s HOMO moves to the donor’s HOMO. In this mechanism, both singlet-singlet and triplet-triplet energy transfers are possible. This contrasts with the Fo¨rster mechanism, which operates in only singlet states.

75 A photophysical study of these porphyrin systems showed the presence of significant intramolecular triplet energy transfer with an estimated kET ranging between 10 6 and 10 8 s 21. Rates for the through-bond process were found to be three to five orders of magnitude larger than the through-space energy transfer. 34 These results can be helpful in predicting the rates for energy transfer (kET) for unknown systems. A similar observation was made by Albinson, using Zn(II)porphyrin as the donor and free base porphyrin as the acceptor.

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