Design, synthesis and applications of cation and anion sensing selective
Ru(II)- Polypyridyl complexes have attracted a considerable attention because of their
multipurpose and promising biological insinuation. Ruthenium(II)-polypyridyl ligands
such as 2,2-bipyridine (bpy), 1,10-phenanthroline (phen), and/ or ortho-phenanthroline
etc. on reaction with Ru(II) forms Ru(II)-polypyridyl complexes which have various
significant benefits like metal-to-ligand charge transfer based on excited visible light
and emission intensity, high chemical and photochemical stabilities, high shifts in
Stokes (particularly more than 150 nm), greater response efficiency, low cytotoxicity
and good water solubility. Owing to the MLCT emission, Ru(II) polypyridyl
complexes were mostly used as essential materials in electro-generated chemiluminescence
analysis offers unique properties like high rigidity, selectivity and less
sensitive to environment. The multifaceted nature of Ru(II) polypyridyl-complexes in
sensing is found as electrochemical sensors, solid state sensors, amperometric sensors,
and straightforward chemosensors. A methodical report of different Ru(II) polypyridylcomplex
chromophores emphasizing fluorophore frame work has been thoroughly
discussed in this chapter. The binding mechanism has been proposed precisely. Unlike
other metal complexes, the versatility and uniqueness of Ru(II) polypyridyl-complexes
as chemosensor is observed in sensing of less common analytes which are rarely
detected according to the literature. Polypyridyl Ru(II)-complexes being covalently
bonded with photo conducting polymer may also be used as photosensitizers.
Keywords: Anions, Cations, Chemosensor, Colorimetric sensor, Fluorescence
sensor, Hazardous metal ions, Molecular probe, Phosphorescence, Sensitive and
selective sensor, MLCT, Ru(II)-polypyridyl complexes.
