Volume 48, Number 4, November II 1999
|Page(s)||461 - 467|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Polymorphic transformations observed on molecular organic thin films: p-nitrophenyl nitronyl nitroxide radical
Institut de Ciència de Materials de Barcelona (CSIC ) Campus de la UAB, E-08193 Bellaterra, Spain
2 Departament de Química-Física, Universitat de Barcelona Martí i Franqués 1, E-08028 Barcelona, Spain
Accepted: 16 September 1999
We report on the experimental observation of the polymorphic transformation from the monoclinic α- to the orthorhombic β-phase of thin films of the molecular organic radical p-nitrophenyl nitronyl nitroxide (p-NPNN). This solid-solid phase transition to the thermodynamically most stable β-phase encompasses clearly differentiated changes in structure and morphology and may be inhibited if the thickness of the films of the initial α-phase lies below a certain critical value. In our case, the α-phase of p-NPNN (α-p-NPNN) has been stabilized as thin film obtained by thermal evaporation in high vacuum (thickness ).
PACS: 81.30.Hd – Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder / 68.55.-a – Thin film structure and morphology
© EDP Sciences, 1999
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