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Self-Assembly of Ruthenium Porphyrins into Monolayer and Multilayer Architectures via Heterogeneous Coordination Chemistry

Published online by Cambridge University Press:  17 March 2011

David M. Sarno
Department of Chemistry and Institute for Materials Research, State University of New York at Binghamton, Binghamton, NY 13902
Luis J. Matienzo
IBM Corporation, Endicott, NY 13760
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Self-assembly chemistry is finding use as a means of controlling the nanoscale structures at materials interfaces. Building on the success of a previous methodology, Ruthenium porphyrins have been coordinated to the pyridine-terminated surface of a self-assembled alkylsilane coupling layer on silica glass. These arrays are built in a stepwise fashion in which the surface of each layer allows further reaction to yield the next layer. Characterization by UV-vis and XPS confirms the deposition of the alkyl chains and pyridine moieties of the coupling layer, as well as coordination of the subsequent Ru-porphyrin layer. AFM analysis indicates very smooth surfaces, with roughness measured at 0.43 nm and 1.43 nm for the pyridine and porphyrin layers, respectively. The occasional appearance of large surface features (15-30 nm diameter) suggests aggregation among Φ-systems, with further characterization underway. Strategies toward the construction of a multilayer porphyrin architecture are also reported.

Research Article
Copyright © Materials Research Society 2001

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