High-performance directional metallopolyamides. II. Optical spectroscopic studies of metal chelation

The chelating interaction between metal ions and 4.4'-disubstituted2.2'- bi pyridyl-containing high-performance polymeric ligands prepared from 2.2'-bi pyridyl-4.4'-dicarboxylic acid and a series of primary aromatic diamines wa s investigated by optical spectroscopy. Optical spectroscopic studies of th e chelation of ruthenium ions by the 2,2'-bipyridyl-containing polyamides r evealed the formation of distinct ruthenium(ll) complexes [Ru-II(poly.)L-4] ( lambda (max) = 530 nm). [ Ru-II(poly), L-2] ( lambda (max) = 584 nm), an d [ Ru-II(poly)(3)](2+) ( lambda (max) = 476 nm) while iron(II) ions formed only one complex (lambda (max) = 569 nm). The diverse functional Features of the polymer repeat unit directly influences the chelation of metal ions.