Metal complexes of poly(2-vinylpyridine 1-oxide), poly(4-vinylpyridine 1-oxide) and 2,2′-trimethylenedipyridine 1-oxide

Poly(2-vinylpyridine 1-oxide) ( 3 ), poly(4-vinylpyridine 1-oxide) ( 4 ), and the dimeric analogue 2,2′-trimethylenedipyridine 1-oxide ( 2 ) form metal complexes with chlorides of copper(II), zinc, mercury(II), iron(III), cobalt(II), and nickel(II) salts. Due to steric reasons 4 forms two series (type 6 and 7 ) of complexes by intramolecular or intermolecular crosslinking in which the ratio NO/metal is 2:1 (type 6 ) or 1:1 (type 7 ), whereas 3 and its model compound 2 can form only intramolecular 2:1 complexes of type 5 .