Reactions catalyzed within inorganic and organic materials and at electrochemical interfaces commonly occur at high coverage and in condensed media, causing turnover rates to depend strongly on interfacial structure and composition, 5326-23-8, Name is 6-Chloronicotinic acid, SMILES is O=C(O)C1=CN=C(Cl)C=C1, in an article , author is Nassar, Sulafa Jamal M., once mentioned of 5326-23-8, COA of Formula: C6H4ClNO2.
Inhibition of the Photobleaching of Methylene Blue by Association with Urea
Methylene Blue has a long history as a photochemical reagent and is known to undergo photofading on exposure to visible light in aqueous solution. Under aerobic conditions, photobleaching occurs by way of a two-step process involving intermediary formation of singlet oxygen. The first step is ascribed to regio-selective addition of singlet oxygen within the precursor complex. This geminate reaction ultimately leads to formation of the leuco-dye via a slower second step. Urea forms a weak ground-state complex with Methylene Blue which affects the optical properties of the dye but is not evident by NMR spectroscopy. This complex is weakly fluorescent and undergoes intersystem crossing to the triplet manifold. The presence of urea decreases the rate of photobleaching of the dye and, at high concentrations of urea, the bleaching kinetics are consistent with an equilibrium mixture of complexed and free dye. The complexed dye does not bleach on the timescale of the experiment. Such protection might arise from urea blocking access to the site where geminate addition of O-2 takes place.
Interested yet? Read on for other articles about 5326-23-8, you can contact me at any time and look forward to more communication. COA of Formula: C6H4ClNO2.
Reference:
Thiazine – an overview | ScienceDirect Topics,
,Thiazine | C4H5NS – PubChem