Liquid/liquid interface polymerized porphyrin membranes displaying size-selective molecular and ionic permeability

Jodi L. O'Donnell, Numrin Thaitrong, Andrew P. Nelson, Joseph T. Hupp

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Thin polymeric membranes have been formed by liquid/liquid interfacial copolymerization of a sterically demanding tetraphenylporphyrin derivative having reactive phenol substituents and a second porphyrin having reactive acid chloride groups. The out-of-plane steric demand is created by 3,5-hexoxyphenyl groups positioned at two of the four meso carbons of the porphyrin ring. The bulky substituents were designed to create local pockets and extended pores within the resulting ester-linked copolymer. Quantitative measures of molecular and ionic transport were obtained by placing membranes over microelectrodes and recording voltammetric responses from redox-active probes. The membranes were found to be permeable to small molecules and ions, but blocking toward larger ones, displaying a sharp size cutoff at a probe diameter of ca. 3.5 A. Molecular transport can be modulated by axially ligating pore-blocking moieties to available porphyrin metal centers.

Original languageEnglish
Pages (from-to)1804-1809
Number of pages6
JournalLangmuir
Volume22
Issue number4
DOIs
Publication statusPublished - Feb 14 2006

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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