Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Polymers bearing at the end of side chains acidobasic indicator moieties exhibiting a solvatochromic absorption band were prepared by a polymeranalogous reaction of copolymers N-(2-hydroxy propyl) methacrylamide-N-methacryloylated 4-nitrophenyl ester ω-aminoacids with 1-(2-aminoethyl)-4-(4-hydroxystyryl)pyridinium bromide. It was found that pK_a of reporters bound at a medium long side chain (six methylene groups) is close to pK_a of a low-molecular model compound, while pK_a of a reporter bound close to the polymer backbone is approximately by one pK_a unit higher. Changes in the pK_a value of the reporters are discussed in connection with a change in the polarity of microenvironment of polymer chains.