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

Table 4

Wavenumbers 𝜈_C^str_−H and integral intensities 𝐴_C^str_−H of C–H bonds of vinyl moiety. To avoid ambiguities italics indicates the CH_𝑥 group to which refers. In parentheses relevant isomer/conformer is denoted.

	𝜈C^str−H (cm^−1)	𝐴C^str−H (km mol^−1 dm^3)
C2H4	3055 [4]	9.6^a [4]
CHF=CHF	3122 (Z) [4]	3.7^a [4]
CHF=CHF	— (E) [4]	4.75^a [4]
CF2=CH2	3133 [4]	2.1 [4]
(CD3)2N−CH=CH(CF3)=O	3135 (EE)	4.27
	3099 (EZ)	1.44
(CD3)2N−CH=CH(CF3)=O	3053 (EE)	2.18
	3051 (EE)^b	2.67^b
	3021 (EZ)	1.47
	3017 (EZ)^c	3.70^c
(CH3)2N−CH=CH(CF3)=O	3124 (EE)	—
	3104 (EZ)	—
(CH3)2N−CH=CH(CF3)=O	3058 (EE)	—
	3023 (EZ)	—

^a𝐴^str_CH(av) is the average IR intensity per CH (i.e., the infrared intensity of the stretching region divided by the number of CH bonds).
^bWavenumber 𝜈_C^str_−H and integral intensity 𝐴_C^str_−H of C−H_𝛼 bond involved in C–H⋯F hydrogen bond.
^cWavenumber 𝜈_C^str_−H and integral intensity 𝐴_C^str_−H of C−H_𝛼 bond involved in C–H⋯O=C hydrogen bond.