COA of Formula: C7H6BrNO2In 2014 ,《Pyridine-N-Oxide 2-Carboxylic Acid: An Acceptor Group for Organic Sensitizers with Enhanced Anchoring Stability in Dye-Sensitized Solar Cells》 appeared in Asian Journal of Organic Chemistry. The author of the article were Cecconi, Bianca; Mordini, Alessandro; Reginato, Gianna; Zani, Lorenzo; Taddei, Maurizio; Fabrizi de Biani, Fabrizia; De Angelis, Filippo; Marotta, Gabriele; Salvatori, Paolo; Calamante, Massimo. The article conveys some information:
A D-π-A organic dye carrying a pyridine-N-oxide 2-carboxylic acid anchoring group (BC1) was synthesized together with two analogs lacking the N-oxide (BC2) or the carboxylic acid moiety (BC3). The distribution and energy of their MOs was determined, and modeling of their spectroscopic properties was performed through a TD-DFT computational study. The photo- and electrochem. properties of the dyes were assessed together with their desorption kinetics from nanocrystalline TiO2. In solution, the absorption spectra of dyes BC1 and BC3 were red-shifted compared with BC2, with the maximum absorption wavelength influenced by the dye protonation level. The 2-substituted carbonitrile dye BC3 was not adsorbed on the titania surface. On the other hand, the pseudo-first order desorption rate constants of BC1 and BC2 suggest that BC1 was removed from TiO2 more slowly than BC2 a reference cyanoacrylate dye, demonstrating that simultaneous use of the N-oxide and the carboxylic acid anchoring functions enhanced the stability of the dye/semiconductor assembly. When used as a photosensitizer for dye-sensitized solar cells, the photovoltaic performance of BC1 was better than BC2, which corresponds to approx. 66 % of that recorded with the reference dye. In addition to this study using Methyl 5-bromopicolinate, there are many other studies that have used Methyl 5-bromopicolinate(cas: 29682-15-3COA of Formula: C7H6BrNO2) was used in this study.
Methyl 5-bromopicolinate(cas: 29682-15-3) belongs to pyridine. The basicity and metallophilic high donor number of these π-deficient systems has long favored them as ligands in metal catalysis. The last decade saw pyridine assume a stronger role as functional group for directed C–H oxidation/activation.COA of Formula: C7H6BrNO2