title: Ammonium hydrogen tartronate at 240 and 20 K.
abstract: The low-temperature structure determination of the title compound, alternatively called ammonium hydrogen hydroxypropanedioate, NH(4)(+) x C(3)H(3)O(5)(-), has revealed that the H atom involved in a very short asymmetric O--H...O hydrogen bond [O...O = 2.448 (2) A at 240 K and 2.4393 (10) A at 20 K] is disordered.
authors.affiliation: Graduate School of Natural Science and Technology, Okayama University, Tsushima, Okayama 700-8530, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Moritani
authors.forename: T
authors.initials: T
authors.lastname: Fukunaga
authors.forename: H
authors.initials: H
authors.lastname: Ishida
authors.forename: S
authors.initials: S
authors.lastname: Kashino