Luminescent acetylthiol derivative tripodal osmium(II) and iridium(III) complexes: Spectroscopy in solution and on surfaces

Srinidhi Ramachandra, Federico Polo, Fabio Edafe, Klaus C. Schuermann, Christian A. Nijhuis, Peter Belser, William F. Reus, George M. Whitesides, Luisa De Cola*

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

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    Luminescent Os(II) and Ir(III) complexes containing a tripodal-type structure terminalized with three thiol derivatives are described. The tripod is introduced through derivatization, with a rigid spacer, of a phenanthroline ligand coordinated to the metal ion, and the entire structure possesses axial geometry. The geometry of the complexes combined with the three anchoring sites, the thiol groups, allows the complexes to adopt an almost perpendicular arrangement to the surfaces and the formation of a well-packed monolayer on Au substrates. The photophysical and electrochemical behavior of the complexes is studied in solution and on surfaces. Furthermore, a self-assembled monolayer (SAM) of Os(II) complexes on an ultraflat Au surface is used to fabricate a metal–molecule–metal junction with Au and In Ga eutectic as electrodes. The Os(II) SAM in the tunneling junction exhibits rectification behavior which is opposite in direction to that which we have previously shown for Ru(II) SAMs.
    Original languageEnglish
    Pages (from-to)779-799
    JournalPure and applied chemistry
    Issue number4
    Publication statusPublished - 2011


    • iridium complexes
    • luminescence
    • osmium complexes
    • photophysics
    • self-assembled monolayers

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