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Kinetics of bromine transfer across Langmuir monolayers of phosphatidylethanolamines at the water/air interface
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UNSPECIFIED. (2003) Kinetics of bromine transfer across Langmuir monolayers of phosphatidylethanolamines at the water/air interface. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 5 (18). pp. 3979-3983. ISSN 1463-9076
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Official URL: http://dx.doi.org/10.1039/b306518a
Abstract
The kinetics of Br-2 transfer across phosphatidylethanolamine monolayers at the water/air (W/A) interface have been investigated using scanning electrochemical microscopy-double potential step chronoamperometry (SECM-DPSC). An homologous series of three phosphatidylethanolamines was considered: L-alpha-phosphatidylethanolamine dilauroyl (DLPE), L-alpha-phosphatidylethanolamine dipalmitoyl (DPPE) and L-alpha-phosphatidylethanolamine distearoyl (DSPE). The SECM-DPSC approach involved positioning a submarine ultramicroelectrode close to a monolayer assembled at the W/A interface at a defined and controllable surface pressure. Br-2 was produced in an initial (forward) potential step, by the diffusion-controlled oxidation of Br-, and then collected by diffusion-controlled reduction in a second (reverse) potential step. The resulting current-time behaviour provided information on both the tip-interface separation (forward step response) and the kinetics of Br-2 transfer (reverse step response). DSPE monolayers were found to diminish the rate of Br-2 transfer across the W/A interface, with the rate constant decreasing as the surface pressure increased. These experimental data were interpreted using a simple energy barrier model. In contrast, monolayers of DLPE and DPPE had no detectable effect on Br-2 transfer kinetics on the SECM time scale.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
| Journal or Publication Title: | PHYSICAL CHEMISTRY CHEMICAL PHYSICS |
| Publisher: | ROYAL SOC CHEMISTRY |
| ISSN: | 1463-9076 |
| Date: | 15 September 2003 |
| Volume: | 5 |
| Number: | 18 |
| Number of Pages: | 5 |
| Page Range: | pp. 3979-3983 |
| Identification Number: | 10.1039/b306518a |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/9244 |
Data sourced from Thomson Reuters' Web of Knowledge
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