In Situ Analysis of Metallosupramolecular Coordination Polyelectrolyte Films by Surface Plasmon Resonance Spectroscopy

Ultrathin layers of a new metallosupramolecular iron(II) coordination−polyelectrolyte containing 1,4-bis(2,2‘:6‘,2‘ ‘-terpyridine-4‘-yl)benzene (1) have been prepared by alternating adsorption from dilute solution. Adsorption on oppositely charged surfaces and layer-by-layer growth were investigated...

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Bibliographic Details
Published in:Langmuir 1999-07, Vol.15 (14), p.4842-4846
Main Authors: Kurth, Dirk G, Osterhout, Robin
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Ultrathin layers of a new metallosupramolecular iron(II) coordination−polyelectrolyte containing 1,4-bis(2,2‘:6‘,2‘ ‘-terpyridine-4‘-yl)benzene (1) have been prepared by alternating adsorption from dilute solution. Adsorption on oppositely charged surfaces and layer-by-layer growth were investigated in situ by surface plasmon resonance spectroscopy. The average film thickness of coordination−polyelectrolyte 1 is 18 Å and is in good agreement with a molecular layer. Water can penetrate the film resulting in an increased film thickness. Adsorption kinetics show two distinct regions. Adsorption is a diffusion-controlled transport process obeying a dependence at the beginning of adsorption. Once a certain amount is adsorbed, adsorption can be described by a first-order rate law. Another minor rise in reflectance at high surface coverages is attributed to additional insertion of metal ion−ligand units into the metallosupramolecular coordination−polyelectrolyte layer.
ISSN:0743-7463
1520-5827
DOI:10.1021/la981760e