Molecular ordering in monolayers of an alkyl-Substituted perylene-bisimide dye by attenuated total reflectance ultraviolet-visible spectroscopy

Surface-relative orientational parameters were determined for monolayer films of N, N'-ditridecylperylenetetracarboxylic dianhydridediimide (C 13-PTCDI) in terms of the relative electronic transition dipole strengths, providing a three-dimensional view of the absorption dipole distribution. In order to obtain a macroscopically ordered film, C 13-PTCDI was deposited by (1) horizontal Langmuir-Blodgett (LB) transfer onto methyl- and phenyl-silanized glass, and (2) vapor deposition onto oriented films of poly(tetrafluoroethylene) (PTFE) on glass. Films of LB-deposited C13-PTCDI were found to be completely Isotropic prior to annealing. After annealing, these films remained isotropic in the plane of the substrate while the out-of-plane anisotropy was significantly enhanced. In contrast, films of C13-PTCDI vapor deposited onto oriented poly(tetrafluoroethylene) (PTFE)-modified substrates yielded films with a high degree of both in- and out-of-plane anisotropy. Atomic force microscopy (AFM) images of both the LB- and vapor-deposited films show substantial differences in film morphology and long-range order. These results demonstrate that molecular orientation in C13-PTCDI films can be controlled by varying substrate surface chemistry and post-deposition processing. © 2005 Society for Applied Spectroscopy.

Simmonds, A.G.Department of Chemistry, University of Arizona, Tucson, AZ 85721 (författare)
Mendes, S.B.Department of Chemistry, University of Arizona, Tucson, AZ 85721, Optical Sciences Center, University of Arizona, Tucson, AZ 85721 (författare)
Armstrong, N.R.Department of Chemistry, University of Arizona, Tucson, AZ 85721, Optical Sciences Center, University of Arizona, Tucson, AZ 85721 (författare)
Saavedra, S.S.Department of Chemistry, University of Arizona, Tucson, AZ 85721 (författare)
University of ArizonaDepartment of Chemistry, University of Arizona, Tucson, AZ 85721 (creator_code:org_t)

Ingår i:Applied Spectroscopy: SAGE Publications59:10, s. 1248-12560003-70281943-3530

Av författaren/redakt...: Doherty, Walter ...; Simmonds, A.G.; Mendes, S.B.; Armstrong, N.R.; Saavedra, S.S.

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