Positive constructs: Charges localized on surface-confined organometallic oligomers

Marc Altman, Olena V. Zenkina, Takahiko Ichiki, Mark A. Iron, Guennadi Evmenenko, Pulak Dutta, Milko E. Van Der Boom

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Assemblies with molecular-level organization based on organic chromophores and a bimetallic palladium complex are presented. A layer-by-layer strategy is employed by alternately coordinating vinylpyridine-terminated chromophores to the metal centers to form cationic oligomers. These new structures are formed from solution on quartz and silicon substrates functionalized with a covalently bound template layer. Twelve consecutive deposition steps result in structurally regular assemblies as demonstrated by linear increases in the ellipsometrically determined thickness and UV-vis optical absorption. The increase in thickness for each additional layer shows that the long-range order of the system is determined by the structure of the chromophores and by the square-planar geometry of the metal centers. Furthermore, the optical properties indicate that the conjugation length of the assembly component does not increase in the surface-bound oligomers with each additional deposition cycle. Structural communication is transferred via the system components, but they remain electronically isolated. This is supported by density functional theory (DFT) calculations.

Original languageEnglish (US)
Pages (from-to)4676-4684
Number of pages9
JournalChemistry of Materials
Issue number19
StatePublished - Oct 13 2009

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry


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