Die NMR‐Spektren von CF 3 I, CF 3 IF 2 und CF 3 IF 4

The NMR Spectra of CF 3 I, CF 3 IF 2 , and CF 3 IF 4 The 19 F‐NMR and 13 C‐NMR spectra of CF 3 I, CF 3 IF 2 and CF 3 IF 4 were recorded in acetonitrile solution. The chemical shifts of the CF 3 ‐groups are strongly dependent on the oxidation state of the iodine atom. With increasing oxidation state the resonances of the CF 3 ‐groups in the 19 F‐NMR spectra are characteristically shifted to high field, whereas in the 13 C‐NMR spectra a characteristic shift to low field is measured. The absolute value of the coupling constants 1 J( 19 F 13 C) increases with increasing oxidation state from 344 Hz (CF 3 I) via 354 Hz (CF 3 IF 2 ) to 359 Hz (CF 3 IF 4 ).