SYNTHESIS OF NICKEL GEL-COMPLEXES BEARING NITROGEN-CONTAINING MACROLIGANDS AND IR SPECTROSCOPIC STUDY OF THEIR STRUCTURE

Polymeric supports of gel-immobilized metal-complex catalytic systems based on nitrogen-containing macroligands-polymer-polymer complexes be tween poly(4-vinylpyridine) and poly(methacrylic acid) and poly(methac rylamide), which can form a cooperative system of interchain donor-acc eptor or hydrogen bonds, were synthesized. The synthesized supports pr eserve all the main advantages of nickel gel-immobilized metal-complex catalytic systems of the first generation based on poly(4-vinylpyridi ne), although differ by the stronger binding of the catalytically acti ve transition-metal complexes. In addition, the systems based on poly( methacrylamide) show high selectivity with respect to I-butene in dime rization of ethylene. The IR spectra of nickel gel-complexes with new macroligands were studied. It was shown that only the nitrogen atom is involved in coordination with nickel. Carboxyl or carbonyl groups do not formally participate directly in coordination but function as ''ex ternal'' ligands increasing the stability of the system as a whole.