Synthesis of a Novel Hydrogel Based on a Coordinate Covalent Polymer Network

Brian W. Pfennig, Andrew Bruce Bocarsly, Robert Krafft Prud'homme

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65 Scopus citations


A new type of polymeric inorganic hydrogel is synthesized from the ligand substitution reaction of K2PdCl4 by a cyanometalate such as K3Fe(CN)6 in aqueous solution. These gels typically contain >95% water, as determined by thermogravimetric analysis. The Pd:Fe ratio is 2:1, independent of the stoichiometry employed, and two chloride ligands are displaced per palladium center. Infrared and electrochemical measurements indicate the presence of bridging cyanide ligands (i.e., Fe-CN-Pd), which lead to the formation of polymeric chains. Interchain cross-links are possible by a number of mechanisms. Dynamic oscillatory rheological measurements were performed during the sol-gel process. The effect of the reactant concentration, Pd:Fe ratio, and concentration of spectator ions on the gelation rate is discussed.

Original languageEnglish (US)
Pages (from-to)2661-2665
Number of pages5
JournalJournal of the American Chemical Society
Issue number7
StatePublished - Apr 1 1993

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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