Materials Data on Ca3(HO3)2 by Materials Project
Ca3(HO3)2 crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are two inequivalent Ca sites. In the first Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are two shorter (2.26 Å) and four longer (2.52 Å) Ca–O bond lengths. In the second Ca site, Ca is bonded in a 7-coordinate geometry to two equivalent H and five O atoms. Both Ca–H bond lengths are 2.35 Å. There are a spread of Ca–O bond distances ranging from 2.29–2.43 Å. H is bonded in a distorted single-bond geometry to two equivalent Ca and two O atoms. There is one shorter (1.00 Å) and one longer (1.66 Å) H–O bond length. There are three inequivalent O sites. In the first O site, O is bonded to three Ca and one O atom to form a mixture of distorted edge and corner-sharing OCa3O tetrahedra. The O–O bond length is 1.51 Å. In the second O site, O is bonded in a distorted single-bond geometry to two Ca and one H atom. In the third O site, O is bonded in a 5-coordinate geometry to three equivalent Ca, one H, and one O atom.