Cross-linked polystyrene resins with 2,6-diformylpyridine bis(2′-pyridylhydrazone) groups. syntheses and metal ion chelation properties

Add time:09/25/2019    Source:sciencedirect.com

Gel-type and macroporous chloromethylated poly(styrene-divinylbenzene) have been functionalized with 2,6-diformylpyridine bis(2′-pyridylhydrazone) groups. The synthetic route involved stepwise chemical modification of the polymer support. Polymer-bound 2,6-dimethoxycarbonylpyridine was converted to the diformyl derivative via a dihydroxymethyl intermediate, and condensation of the resin containing formyl groups with 2-hydrazinopyridine yielded the required chelating functionality. The entire sequence of reactions was also carried out in solution using 4-benzyloxy-2,6-dimethoxycarbonylpyridine as a model compound. The macroporous polystyrene-based resin exhibited a higher loading capacity for Cu(11) than the gel-type resin, the maximum capacity of the former being in the range 0.54–0.57 mmol/g. The resin proved to be stable under acid stripping conditions and showed a higher affinity for Cu(II) than for Co(II), Ni(II) or Zn(II).

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