The NMR Spectra of CF3I, CF3IF2, and CF3IF4The19F‐NMR and13C‐NMR spectra of CF3I, CF3IF2and CF3IF4were recorded in acetonitrile solution. The chemical shifts of the CF3‐groups are strongly dependent on the oxidation state of the iodine atom. With increasing oxidation state the resonances of the CF3‐groups in the19F‐NMR spectra are characteristically shifted to high field, whereas in the13C‐NMR spectra a characteristic shift to low field is measured. The absolute value of the coupling constants1J(19F13C) increases with increasing oxidation state from 344 Hz (CF3I) via 354 Hz (CF3IF2) to 35