Molecularly organized Langmuir-Blodgett films from a ruthenium biphosphine complex.
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.
Wohnrath
K
K
Departamento de Química, UEPG, Ponta Grossa/PR, Brazil. kawoh@uepg.br
Constantino
C J L
CJ
Antunes
P A
PA
dos Santos
P M
PM
Batista
A A
AA
Aroca
R F
RF
Oliveira
O N
ON