The structure of deuterated formic acid has been refined using neutron powder diffraction data collected at 4.5 (+ 1 .) K, with isotropie and anisotropic temperature factors. The resulting geometry is compared with that from a previous X-ray determination [Holtzberg, Post & Fankuchen, Acta Cryst. (1953), 6, 127-130]. In the present refinement the CO bond lengths are different [ 1.36 (2), 1-23 (2) A] and are in agreement with those of other carboxylic acids. The presence of deuterium causes an increase in the O. . . O bond length.
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Albinati et al. (1978) studied this question.
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