The oriented growth of p -nitroaniline and hydroquinone deposited from the vapor phase on monooriented thin films of poly(tetrafluoroethylene) (PTFE) prepared by friction transfer is investigated by grazing incidence X-ray diffraction and polarized FTIR spectroscopy. Due to the formation of two-dimensional hydrogen-bonded networks, both aromatic compounds crystallize with a layered structure. p -Nitroaniline is found to contact the (100) PTFE surface with its (101) PNA crystallographic plane which is parallel to the hydrogen-bonded sheet. A similar PTFE/hydrogen-bonded sheet interface was never observed for γ-hydroquinone crystals vacuum deposited under similar experimental conditions. In fact, hydroquinone orients on PTFE with a (110) HYD or (11̄0) HYD contact plane. Reconstruction of the PTFE substrate at the substrate/deposit interface is invoked as a tentative explanation of the difference in orientational behavior of these two organic compounds.
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Damman et al. (1997) studied this question.
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