Materials Data on Hf(ClO4)4 by Materials Project

Abstract

Hf(O4Cl)4 crystallizes in the monoclinic Cc space group. The structure is zero-dimensional and consists of four Hf(O4Cl)4 clusters. Hf is bonded to eight O atoms to form distorted HfO8 hexagonal bipyramids that share edges with four ClO4 tetrahedra. There are a spread of Hf–O bond distances ranging from 2.19–2.22 Å. There are fifteen inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the second O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.55 Å. In the third O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the fourth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.53 Å. In the fifth O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the sixth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.53 Å. In the seventh O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the eighth O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.41 Å. In the ninth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.54 Å. In the tenth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.53 Å. In the eleventh O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.54 Å. In the twelfth O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. In the thirteenth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.54 Å. In the fourteenth O site, O is bonded in a water-like geometry to one Hf and one Cl atom. The O–Cl bond length is 1.53 Å. In the fifteenth O site, O is bonded in a single-bond geometry to one Cl atom. The O–Cl bond length is 1.42 Å. There are four inequivalent Cl sites. In the first Cl site, Cl is bonded to four O atoms to form ClO4 tetrahedra that share an edgeedge with one HfO8 hexagonal bipyramid. In the second Cl site, Cl is bonded to four O atoms to form ClO4 tetrahedra that share an edgeedge with one HfO8 hexagonal bipyramid. In the third Cl site, Cl is bonded to four O atoms to form ClO4 tetrahedra that share an edgeedge with one HfO8 hexagonal bipyramid. In the fourth Cl site, Cl is bonded to four O atoms to form ClO4 tetrahedra that share an edgeedge with one HfO8 hexagonal bipyramid.