Molecularly organized Langmuir-Blodgett films from a ruthenium biphosphine complex
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Data
2005-03-24
Autores
Wohnrath, K.
Constantino, CJL
Antunes, P. A.
dos Santos, P. M.
Batista, A. A.
Aroca, R. F.
Oliveira, O. N.
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Amer Chemical Soc
Resumo
Langmuir-Blodgett (LB) films from a ruthenium complex mer-[RuCl3 (dppb)(4-Mepy)] (dppb = PPh2 (CH2)(4)-PPh2; 4-Mepy = 4-methylpyridine), termed Ru-Pic, display a distinct color, which is different from the coloration exhibited by cast films or chloroform solutions. The solution and cast films are red, while the LB films are green-bluish. The manifestation of the blue color in the LB film finds its explanation in a unique absorption band at 690 nm, which is associated with the oxidation of the phosphine moieties. Fluorescence emission and absorption-reflection infrared spectroscopy measurements revealed the molecular organization in the LB films. In contrast, cast films showed a random distribution of complexes. Surface-enhanced Raman scattering was also used in an attempt to identify the main interactions in Ru-Pic.
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Journal of Physical Chemistry B. Washington: Amer Chemical Soc, v. 109, n. 11, p. 4959-4964, 2005.