Photoinduced charge transfer properties of bolaamphiphile         membrane-gramicidrin diad composites

David H. Thompson; Jong-Mok Kim; Ciro Di Meglio

doi:10.1117/12.144055

27 April 1993 Photoinduced charge transfer properties of bolaamphiphile membrane-gramicidrin diad composites

David H. Thompson, Jong-Mok Kim, Ciro Di Meglio

Proceedings Volume 1853, Organic and Biological Optoelectronics; (1993) https://doi.org/10.1117/12.144055
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

Abstract

Ether-linked bolaform amphiphiles (Langmuir 1992 8, 637; J. Am. Chem. Soc. 1992, 9035) and novel gramicidin-porphyrin `diads' (MRS Symposium Series, Vol. 277, 1992, 93) have been synthesized. Protocols for vectorial insertion of the derivatized gramicidins into bolaform lipid vesicles have been developed and the photochemical behavior of these proteinaceous composite membranes probed in the presence of electron donors and acceptors. Photoinduced electron transfer properties of the gramicidin-porphyrin conjugates were compared in TRIS- buffered dihexadecyl-phosphate bilayer (DHP) and bolaform monolayer membrane vesicles containing dithiothreitol as sacrificial donor and methyl viologen as electron acceptor on both the inner and outer vesicle surfaces. Although the rates of methyl viologen photoreduction varied depending on the mode of diad orientation within DHP bilayer membranes, photoreduction rates were not orientation- dependent in bolaform membrane vesicles containing the gramicidin-porphyrin diad. The relevance of these results on vectorial electron transfer processes in lamellar systems and the design of integrated charge transfer components is discussed.

Citation Download Citation

David H. Thompson, Jong-Mok Kim, and Ciro Di Meglio "Photoinduced charge transfer properties of bolaamphiphile membrane-gramicidrin diad composites", Proc. SPIE 1853, Organic and Biological Optoelectronics, (27 April 1993); https://doi.org/10.1117/12.144055

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