Molecular sieving by electropolymerized porphyrin films only a few monolayers thick

Journal Article · Thu Jul 13 00:00:00 EDT 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100351a047· OSTI ID:7157865

Pressprich, K A; Maybury, S G; Thomas, R E; Linton, R W; Irene, E A; Murray, R W ^[1]

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1. Univ. of North Carolina, Chapel Hill (USA)

Polymeric films can be formed on smooth Pt electrodes by oxidative polymerization of cobalt tetrakis(o-aminophenyl)porphyrin, (Co(o-NH{sub 2})TPP). Although the films are extremely thin, as few as two monomolecular layers of porphyrin sites, they exhibit permeabilities to molecular monomers that fall in a regular order of permeant molecular volume. The molecular sieving property is taken as evidence that membrane transport, rather than pinhole transport, is the predominant transport mechanism in these films. The permeability data are supported by film thickness measurements by electrochemical reactivity, surface profilometry, transmission spectrophotometry, ellipsometry, and X-ray photoelectron spectroscopy.

• OSTI ID: 7157865
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 93:14; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
THIN FILMS
MOLECULAR SIEVES
DATA ANALYSIS
EXPERIMENTAL DATA
MEASURING INSTRUMENTS
MEASURING METHODS
MEMBRANE PORES
PLATINUM
PORPHYRINS
ADSORBENTS
CARBOXYLIC ACIDS
DATA
ELEMENTS
FILMS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLATINUM METALS
TRANSITION ELEMENTS
360603* - Materials- Properties
400201 - Chemical & Physicochemical Properties