Quantitative and qualitative counterion exchange in cationic metallocene polyelectrolytes

Jiuyang Zhang, Perry J. Pellechia, Jeffery Hayat, Christopher G. Hardy, Chuanbing Tang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Metallocene-containing polyelectrolytes show many unique properties in a variety of electrochemical, optoelectronic, medicinal, and magnetic applications. The utilization of counterions plays crucial roles in many aspects of these polyelectrolytes. This paper reports the first quantitative analysis of counterion exchange in metallocene-containing polyelectrolytes. Particularly counterion exchange of cationic cobaltocenium-containing polyelectrolytes was analyzed by diffusion NMR, which determined molar fractions of dissociated and associated ions as well as ion-exchange constant. Qualitative impact of counterion exchange on macromolecular conformation was directly observed from cobaltocenium-containing molecular brushes. This study may provide valuable guidance on applications such as layer-by-layer assembly and ion-triggered drug delivery that are involved with ion exchange of polyelectrolytes.

Original languageEnglish (US)
Pages (from-to)1618-1624
Number of pages7
Issue number4
StatePublished - Feb 26 2013
Externally publishedYes


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