Molecular Self-Assembling of -Methylacetamide in Solvents
Figure 3
Concentration dependence of the apparent molar absorptivity of NMA in CCl4 (0.12, 0.25, 0.6, 1.0, 4.0, and 8.0 mol dm−3) and in pure liquid (13.0 mol dm−3; dashed line) at 30°C. The value was obtained by dividing the observed absorbance by the light-path length of the cell and the NMA concentration. The 1470-nm band due to the free NH moiety of monomer steeply increases with decreasing concentration of NMA, while the 1520 and 1600-nm bands due to the hydrogen-bonded NMA aggregates slightly decrease. The dashed line denotes the pure liquid sample of NMA. The of pure liquid at 1470 nm is very small compared with those at low concentrations.
