title: Molecularly organized Langmuir-Blodgett films from a ruthenium biphosphine complex.
abstract: Langmuir-Blodgett (LB) films from a ruthenium complex mer-[RuCl3 (dppb)(4-Mepy)] (dppb = PPh2 (CH2)4PPh2; 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.
authors.affiliation: Departamento de Química, UEPG, Ponta Grossa/PR, Brazil. kawoh@uepg.br
authors.forename: K
authors.initials: K
authors.lastname: Wohnrath
authors.forename: C J L
authors.initials: CJ
authors.lastname: Constantino
authors.forename: P A
authors.initials: PA
authors.lastname: Antunes
authors.forename: P M
authors.initials: PM
authors.lastname: dos Santos
authors.forename: A A
authors.initials: AA
authors.lastname: Batista
authors.forename: R F
authors.initials: RF
authors.lastname: Aroca
authors.forename: O N
authors.initials: ON
authors.lastname: Oliveira