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We previously demonstrated that the δ NMR chemical shift of central NMR active atoms (A), in simple halido [AX n ] (A=C, Si, Ge, Sn, Pb, Pt; X n  = combination of n halides, n = 4 or 6) derivatives, could be directly related to X radii overall sum, Σ( r  L   ). Further correlation have also been observed for tetrahedral [AX 4 ] (A=C, Si; X 4  = combination of four halides) compounds where the X Pauling electronegativities sum,Σ  (   χ  L   Pau    )  ,    $\Sigma (\chi _L^{{\rm{Pau}}}),$    exceeds a specific value (≈12.4). In this work, we focused on these latter systems considering the H vs. X substitution. The analysis of the literature reported δ( 13 C) and δ( 29 Si) NMR chemical shift for the mono hydrogenated derivatives and in particular for [CHF 3 ] and [SiHF 3 ], characterized by the lowest Σ( r  L   ) and the highestΣ  (   χ  L   Pau    )  ,    $\Sigma (\chi _L^{{\rm{Pau}}}),$    suggests a revised value for the H electronegativity ranking with respect to Pauling’s.

Is hydrogen electronegativity higher than Pauling’s value? New clues from the 13 C and 29 Si NMR chemical shifts of [CHF 3 ] and [SiHF 3 ] molecules