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A Bipodal-Tethered Porphyrin for Attachment to Silicon Surfaces in Studies of Molecular Information Storage

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An approach for molecular information storage entails use of redox-active molecules attached to an electroactive surface. Understanding the structural features that give rise to robust molecular monolayers with high charge density is an essential objective. Toward this goal, a zinc-porphyrin bearing an all-carbon bipodal tether, 5-(1,6-heptadien-4-yl)-15-phenyl-10,20-di-p-tolylporphinatozinc(II), has been synthesized by the reaction of a dipyrromethane and a dipyrromethane-1,9-dicarbinol. The porphyrin was attached to Si(100) via a high temperature procedure. The resulting molecular monolayers exhibited surface coverages, adsorption geometries, electron-transfer rates, and stabilities under repeated electrochemical cycling that are similar to those obtained with monopodal carbon tethers. The observation that the bipodal anchor does not provide enhanced stability is surprising given that attachment is achieved via two versus one covalent linkage.


Document Type: Research Article


Publication date: September 1, 2008

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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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