Spectroscopic characterizations of the mixed Langmuir-Blodgett (LB) films of 2,2'-biquinoline molecules: evidence of dimer formation
arXiv:0807.2664 · doi:10.1016/j.cplett.2005.02.060
Abstract
This communication reports the -A isotherms and spectroscopic characterizations of mixed Langmuir and Langmuir-Blodgett (LB) films of nonamphiphilic 2, -biquinoline (BQ) molecules, mixed with polymethyl methacrylate (PMMA) and stearic acid (SA). The pi-A isotherms and molefraction versus area per molecule studies indicate complete immiscibility of sample (BQ) and matrix (PMMA or SA) molecules. This immiscibility may lead to the formation of microcrystalline aggregates of BQ molecules in the mixed LB films. The scanning electron micrograph gives the visual evidence of microcrystalline aggregates of BQ molecules in the mixed LB films. UV-Vis absorption, fluorescence and excitation spectroscopic studies reveal the nature of these microcrystalline aggregates. LB films lifted at higher surface pressure indicate the formation of dimer or higher order n-mers.
21 pages, 5 figures
Cited by in corpus (6)
- J-aggregates of thiacyanine dye organized in LB films: effect of irradiation of light
- Formation of complex Langmuir and Langmuir-Blodgett films of water soluble rosebengal
- Photophysical characterizations of 2-(4-Biphenylyl)-5 phenyl-1,3,4- oxadiazole in restricted geometry
- Formation of complex films with water-soluble CTAB molecules
- Role of microenvironment in the mixed Langmuir-Blodgett films
- Monolayer Characteristics of Pyrene Mixed with Stearic Acid at the Air-Water Interface