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We have experimentally shown by neutron diffraction significant shortening of both sp3- and sp2-hybridized C-H bonds to 1.092(2) and 1.081(1) Å in a hydrogen-bonded crystal of a difluorinated compound, 4-((2,2-difluoroethoxy)methyl)pyridinium saccharinate. Both MP2 and DFT calculations affirmed the C-H bond shrinkages. Sanderson's electronegativity equalization principle provides insight into the shortening of the C-H covalent bond lengths for both sp3- and sp2-hybridized carbon atoms. To the best of our knowledge, this neutron diffracti
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