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Stable Photoinduced Charge Separation in Nanostructured Films Containing a 1,4,5,8-Naphthalenetetracarboxylic Diimide and Cytochrome c

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Photoinduced electron transfer between 1,4,5,8-naphthalenetetracarboxylic diimides (NDI)and the redox protein cytochrome c (cyt c)was studied in solution and in spin-coated thin films. The NDI derivatives employed in this study were N,N′-bis(butyl)-1,4,5,8-naphthalenetetracarboxylic diimide (BNDI)and N,N′-bis(2-phosphonoethyl)-1,4,5,8-naphthalenetetracarboxylic diimide (PNDI). Irradiation of the NDI in solution with UV light (365 nm), in the presence of cyt c, resulted in the reduction of the heme iron from the Fe3+ to the Fe2+ state. When PNDI and cyt c were co-deposited by spin-coating on quartz, glass, and silicon substrates, photoactive films were obtained. Exposition of the films to a UV lamp or natural sun light resulted in photoreduction of the protein, generating a stable charge-separated state. Thin films containing segregated layers of BNDI and cyt c were also prepared. Irradiation of these films, however, resulted in protein degradation. The results can be explained through the formation of imide radicals, which transfer an electron to cyt c in the co-deposited films. In the case of segregated films, protein photodegradation suggests the formation of singlet oxygen within the films.


Document Type: Research Article


Publication date: 2006-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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