Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 13, Issue 24, Pages 6891-6898Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200700496
Keywords
coordination cages; fluorescence; self-assembly; silicon surfaces; surface analysis
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Bottom-up fabrication of 3D organic nanostructures on Si(100) surfaces has been achieved by a two-step procedure. Tetradentate cavitand I was grafted on the Si surface together with 1-octene (Oct) as a spatial spectator by photochemical hydrosilylation. Ligand exchange between grafted cavitand 1 and self-assembled homocage 2, derived from cavitand 5 bearing a fluorescence marker, led to the formation of coordination cages on Si(100). Formation, quantification, and distribution of the nanoscale molecular containers on a silicon surface was assessed by using three complementary analytical techniques (AFM, XPS, and fluorescence) and validated by control experiments on cavitand-free silicon surfaces. Interestingly, the fluorescence of pyrene at approximate to 4 nm above the Si(100) surface can be clearly observed.
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