Hydrogenoxalate or hydrogen oxalate is an anion with chemical formula HC2O4− or HO2C–CO2−, derived from oxalic acid by the loss of a single proton; or, alternatively, from the oxalate anion C2O42− by addition of a proton.
The name is also used for any salt containing this anion, such as NaHC2O4, KHC2O4, or NH3HC2O4. Hydrogenoxalates may also be called (especially in older literature) bioxalates, acid oxalates, or monobasic oxalates.
- Roland Tellgren and Ivar Olovsson (1971) The crystal structures of normal and deuterated sodium hydrogen oxalate monohydrate NaHC2O4·H2O and NaDC2O4·D2O. Hydrogen bond studies. XXXXVI. The Journal of chemical physics pp. 234–238.
- R. G. Delaplane, R. Tellgren and I. Olovsson (1984) Neutron diffraction study of sodium hydrogen oxalate monohydrate, NaHC2O4·H2O, at 120 K. Acta Crystallographica, volume C40, 1800–1803 doi:10.1107/S0108270184009616
- M. Hamadène, H. Kherfi, A. Guehria-Laidoudi (2006), The polymeric anhydrous rubidium hydrogen oxalate. Acta Crystallographica volume A62, p. s280
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