Abstract
113Cd, 19F, and 13C NMR spectroscopic data of adducts of the type ( R f ) 2Cd·diglyme ( R f = CF 3, C 2F 5, n-C 3F 7, i-C 3F 7, C 6F 6) are reported for solutions in CD 3CN. The cadmium-113 shielding is interpreted in terms of Lewis acid-base complex stability; high shielding indicates high complex stability. The 113Cd, 19F, and 13C chemical shifts of the nuclei in the central moiety f C ∥ ∥ Cd are strongly dependent on the number of fluorine atoms bonded to the a-carbon because this number determines the group electro-negativity of the R f group and the π-bond order in the FC bond. The chemical shifts correlate one with another and with the coupling constants 1 J(FC) α, 1 J(CdC), and 2 J(CdF). The coupling constants 1 J(CdC) are extremely large and correlate with the group electronegativity of R f . The large values are interpreted in terms of contraction of the carbon and cadmium orbitals by the highly electronegative substituents.
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