Download Photoinduced Electron Transfer IV by Jochen Mattay, R.F. Khairutdinov, H.D. Roth, P. Suppan, K.I. PDF

By Jochen Mattay, R.F. Khairutdinov, H.D. Roth, P. Suppan, K.I. Zamaraev

1. ok. Zamaraev, R. Khairutdinov: Photoinduced Electron Tunneling Reactions in Chemistry and Biology 2. P. Suppan: The Marcus Inverted area three. H.D. Roth: constitution and Reactivity of natural Radical Cations

Show description

Read or Download Photoinduced Electron Transfer IV PDF

Similar chemistry books

Cohesion and Structure of Surfaces

Prior to now fifteen years there was a dramatic raise within the variety of various surfaces whose buildings were decided experimentally. for instance, while in 1979 there have been in basic terms 25 recorded adsorption buildings, so far there are greater than 250. This quantity is for this reason a well timed overview of the state of the art during this dynamic box.

In Pursuit of Gold: Alchemy Today in Theory and Practice

This booklet is pretty well to the purpose, with no placing every little thing into riddles and beating round the bush to confuse you.

Extra resources for Photoinduced Electron Transfer IV

Sample text

F. 5 and 11 ,~ for TPP-L-BQ, T P P - L - N Q and TPP-L-AQ, respectively. The efficiency of luminescence quenching (see Table 4) was found to correlate with the change in the free energy, - AG °, of the electron transfer reaction estimated according to the formula (see Sect. 2) - a G ° = E(S,) - E(P/P +) + E ( Q / Q - ) ~40) where E(S1) is the excitation energy of the donor singlet state S 1, E(P/P +) is the porphyrin oxidation potential, and E ( Q / Q - ) is the quinone reduction potential. For the sake of simplicity, the Coulomb term is omitted from the equation since it is the same for all three compounds.

A strong quenching of the fluorescence of the porphyrin fragment by the quinone fragment was discovered in these compounds. The suggestion that the quenching of the porphyrin fragment fluorescence by quinone is due to intramolecular electron transfer was first made in Refs. [122] and [123]. The Soret band of P-L-Q was found [123] to be notably broader than that of the free porphyrin, P, and the quantum yield of P fluorescence was observed to decrease by a factor of more than 10 s. Both these facts were explained by electron transfer from the *P fragment to the Q fragment.

The Soret band of P-L-Q was found [123] to be notably broader than that of the free porphyrin, P, and the quantum yield of P fluorescence was observed to decrease by a factor of more than 10 s. Both these facts were explained by electron transfer from the *P fragment to the Q fragment. The hypothesis about electron transfer from *P to Q has since been repeatedly used to account for the nonexponential character of P fluorescence decay as well as for the dependence of the efficiency of fluorescence quenching on the length of the bridge L, the nature of the porphyrin fragment and the nature of the solvent [124-126].

Download PDF sample

Rated 4.45 of 5 – based on 33 votes