Chelate polymers. V. Novel alternating copolymers based on transition metal-azomethine complexes and siloxanes

The Schiff base of 2,4-dihydroxybenzaldehyde with ethylenediamine has been prepared and complexed with two different divalent metals: Cu(II) and Ni(II). The resulting bisphenolic chelates were inserted in new alternating polymeric structures by their polycondensation with 1,3-bis-(chloromethyl)-1,1,3,3-tetramethyldisiloxane or alpha,omega-bis(chloromethyl)oligodimethylsiloxanes having different numbers of siloxane units in the chains. In order for their activation, the chelates were converted in salt forms by previously treating them with a NaOH 0.1 N solution or in situ in the presence of anhydrous K2CO3. DMF was used as a solvent. The structures of the ligand, complexes, and polymers obtained on their basis were confirmed by IR, UV, and H-1 NMR. Characterization was undertaken by thermogravimetric analysis (TGA), solubility tests, and viscosity measurements.