Absolute rate constants for 5-deazariboflavin (cas 19342-73-5) triplet excited state in one-electron transfer processes

Add time:08/02/2019    Source:sciencedirect.com

Laser-flash photolysis was employed to determine absolute rate constants for quenching of 5-deazariboflavin (cas 19342-73-5) triplet excited state by amines and phenols in methanol solution. The observed reactivity order for triplet quenching by aliphatic amines parallels very well the corresponding trend in oxidation potentials for these reducing agents; quenching by aromatic amines is significantly more efficient. In the case of phenols, quenching rate constants render a Hammett reaction constant (ρ) value of −1.2 ± 0.1. This negative ρ value is in accord with a mechanism in which hydrogen-atom transfer from phenols to 5-deazariboflavin triplet excited state takes place via an electron–proton transfer sequence.

We also recommend Trading Suppliers and Manufacturers of 5-deazariboflavin (cas 19342-73-5). Pls Click Website Link as below: cas 19342-73-5 suppliers

Prev:Assessing the stoichiometric efficacy of mammalian expressed paraoxonase-1 variant I-F11 (cas 19340-14-8) to afford protection against G-type nerve agents
Next:Isolation and identification of a naturally occurring 7, 8-didemethyl-8-hydroxy-5-deazariboflavin (cas 19342-73-5) derivative from Mycobacterium avium)