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Molecular organization of a water-insoluble iridium(III) complex in mixed monolayers by Juan J. Giner-Casares; Marta Pérez-Morales; Henk J. Bolink; Eulogia Muñoz; Gustavo de Miguel; María T. Martín-Romero; Luis Camacho is a Chemistry article available to read on EtoBox.
What is Molecular organization of a water-insoluble iridium(III) complex in mixed monolayers about?
In this work, organized mixed monolayers containing a cationic water-insoluble iridium(III) complex, Ir-dye, [Ir(ppy) 2 (tmphen)]PF 6 , (tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline, and ppy = 2-phenylpyridine), and an anionic lipid matrix, DMPA, dimyristoyl-phosphatidic acid, with different molar proportions, were formed by the co-spreading method at the air-water interface. The presence of the dye at the interface, as well as the molecular organization of the mixed films, is deduced from surface techniques such as π -A isotherms, Brewster angle microscopy (BAM) and reflection spectroscopy. The results obtained remark the formation of an equimolar mixed film, Ir-dye/DMPA = 1:1. BAM images reveal a whole homogeneous monolayer, with gradually increasing reflectivity along the compression process up to reaching the collapse of this equimolecular monolayer at π ≈ 37 mN m -1 . Increasing the molar ratio of DMPA in the mixture, the excess of lipid molecules organizes themselves forming dark flower-like domains of pure DMPA at high surface pressures, coexisting with the mixed Ir-dye/DMPA = 1:1 monolayer. On the other hand, unstable mixed monolayers are obtained by using an initial dy
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- Author
- Juan J. Giner-Casares; Marta Pérez-Morales; Henk J. Bolink; Eulogia Muñoz; Gustavo de Miguel; María T. Martín-Romero; Luis Camacho
- Publisher
- Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 0021-9797)
- Published
- 2007
- Language
- EN
- Field
- Chemistry (Physical Sciences)