MAGNETIC-PROPERTIES OF POLYMERS CONTAINING PARAMAGNETIC METALLOPORPHYRINS IN THEIR MAIN-CHAIN

Polymers containing paramagnetic metalloporphyrins in their main chain s were prepared by condensation copolymerization of is(ethoxyphenyl)-1 5,20-bis(hydroxyphenyl)porphyrin (HETPP) with dibromomethane. Paramagn etic metal ions were introduced to porphyrin moieties. This type of po lymer is expected to show novel magnetic behavior through both intra- and intermolecular interactions. PolyHETPP-M (M = Ag-II, Cu-II, Co-II, or (VO)-O-IV) contains 5-10 HETPP units and is soluble in many organi c solvents. Magnetic properties of polymer and monomer were investigat ed by measurements of magnetic susceptibilities. In the course of this research, solvent effects on magnetic properties of obtained polymers in reprecipitation of polymer containing vanadyl ion was observed. Ma gnetic interactions of vanadyl complex of polymer were varied from ant iferromagnetic to ferromagnetic by precipitation in methanol. ESR meas urements indicated that the origin of the difference was caused from l igation of methanol, which was used as precipitation solvent, to vanad yl ion to prevent stacking of porphyrin moieties. From this result, it is possible that magnetic property of polyHETPP-(VO)-O-IV can be cont rolled by the selection of solvents for purification of polymers.