Synthesis and spectroscopic properties of a new high molecular weight poly-spirophosphazene–oxypyridine copolymer and its complexes with W(CO) 5 fragments

Abstract

The polyspirophosphazene copolymer {[NP(O 2C 12H 8)] 0.7[NP(OC 5H 4N) 2] 0.3} n ( 2); that carries pyridine side groups has been prepared from [NPCl 2] n , by reaction first with 2,2′-dihydroxybiphenyl and potassium carbonate in THF to give a solution of the partially substituted polymer {[NP(O 2C 12H 8)] 0.7[NPCl 2] 0.3} n ( 1), followed by the reaction of the latter with 4-hydroxypyridine (HOC 5H 4N) also in the presence of potassium carbonate. The reaction of ( 2) with [W(HOMe)(CO) 5] in a CH 2Cl 2–MeOH mixture gave the polymeric complex {[NP(O 2C 12H 8)] 0.7[NP(OC 5H 4NW(CO) 5) 2] 0.3} n ( 4), that, upon treatment with NCMe in THF produced derivatives with less metal carbonyl contents.