The very weak microwave spectra of six isotopically substituted species of formic acid in the cis rotamer form (i.e. with the two hydrogen atoms cis to each other) have been studied. From the data on HC18OOH, HCO18OH, H13COOH, HCOOD, DCOOH and DCOOD, together with the previously published data for HCOOH, the complete substitution structure of the eis rotamer of formic acid has been derived. The structure is: rs(C-H) = 1.105(4) A, rs(C=O) = 1.195(3) A, rs(C-O) = 1.352(3) Å, rs(O-H) = 0.956(5) Å, ∢(OCO) = 122.1(4)°, ∢(HC-O) = 114.6(6)° and ∢(COH) = 109.7(4)°
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Bjarnov et al. (1978) studied this question.