Synthesis, characterization, and properties of covalently bound, self-assembled porphyrin multilayer thin films
- Los Alamos National Lab., NM (United States)
The synthesis and characterization of covalently bound, self-assembled, multilayer thin films of 5,10,15,20-tetra-4-pyridyl-21H,23H-porphine (TPyP) on fused quartz substrates and the native oxide of silicon (100) surfaces are described. The surface-bound multilayer thin films were grown by anchoring TPyP to a [p-(chloromethyl)phenyl]trichlorosilane coupling layer (Cp) and then assembling the sequential TPyP layers via its pyridyl {open_quotes}tether{close_quotes} groups with {alpha},{alpha}{prime}-dichloro-p-xylene linkers (Ln) to form an alternating layered structure Cp(TPyPLn){sub n}. These self-assembled thin films consist of conjugated porphyrin macrocycle dislike structures that were analyzed by UV-visible spectroscopy, X-ray photoelectron spectroscopy, secondary ion mass spectrometry, and polarized variable-angle, internal attenuated total reflection infrared (PVAI-ATR-IR) measurements. Surface acoustic wave (SAW) mass transduction and electronic absorption spectra reveal that the surfaces coverages of each layer is a densely packed monolayer (Cp 6.3 x 10{sup -7} mmol/cm{sup 2}; TPyP 2.0 x 10{sup -7} mmol/cm{sup 2}). Both the film thickness (t = 18 {angstrom} for each bilayer) and the average molecular orientation angle (Psi = 43{degrees}) of the surface bound chromophores were measured by the PVAI-ATR-IR technique, which are in excellent agreement with polarized, variable-angle second harmonic generation measurements. 23 refs., 7 figs.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 369926
- Journal Information:
- Chemistry of Materials, Vol. 6, Issue 6; Other Information: PBD: Jun 1994
- Country of Publication:
- United States
- Language:
- English
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