C–H⋯F Hydrogen Bond and Integral Intensities of Vinyl C–H Vibtations in Push-Pull β-Dimethylaminotrifluoromethyl Ketone and Its Deuterated Analog

Table 2

Dependence of wavenumbers and intensities of CF₃ stretching vibrations on concentration of d₆-DTNBN and temperature.

Wavenumber		Intensity
Concentration increase	Temperature increase	Concentration increase	Temperature increase
Band at 1280 cm^−1 (𝜈CF3 + 𝜈C−CF3 + 𝜈C=C)
Decreases	Increases	Increases	Decreases
Band at 1190 cm^−1 (𝜈𝑎CF3 + 𝛿CH𝛼)
Decreases	Increases	Very weak dependence	Decreases
Band at 1142 cm^−1 (𝜈𝑠CF3 + 𝛿CH𝛼)
Decreases	Increases	Very weak dependence	Decreases
Band at 1090 cm^−1 (𝛿CH𝛼+𝜈sCF3)
Increases	Decreases	Increases	Decreases