Convenient synthesis of tridentate 2,6-di(pyrazol-1-yl)-4-carboxypyridine and tetradentate 6,6 '-di(pyrazol-1-yl)-4,4 '-dicarboxy-2,2 '-bipyridine ligands
Citrazinic acid is used as a convenient starting material for both tridentate 2,6-di(pyrazol-1-yl)-pyridine and tetradentate 6,6'-di(pyrazol-1-yl)-2,2'-bipyridine ligands containing carboxylic groups useful for further anchoring of sensitizer on TiO2 for dye-sensitized solar cells (DSCs). Using 2,6-dichloro-4-carboxypyridine, the synthesis of the terdentate ligands was improved compared to previously used 2,6-dibromo-4-carboxypyridine or 2,6-dichloro-4-ethylcarboxylate pyridine. Controlling the reaction conditions, it is possible to efficiently obtain the monosubstituted 2-chloro-6-pyrazol-1-yl-4-carboxypyridine, a key intermediate for the preparation of tetradentate 6,6'-di(pyrazol-1-yl)-4,4'-dicarboxy-2,2'-bipyridine ligand. (C) 2010 Elsevier Ltd. All rights reserved.
Keywords: Bipyridine ; Pyrazole ; Dye-sensitized solar cells ; Tetradentate ligands ; Terdentate ligands ; Terpyridine Analogs ; Solar-Cells ; Complexes ; Ruthenium(Ii) ; 2,2'/6',2''-Terpyridines ; Sensitizers
Record created on 2011-06-08, modified on 2016-08-09