Materials Data on BaCuO6 by Materials Project
(BaCuO4)4(Ba2Cu2O9)2(O2)7 crystallizes in the triclinic P1 space group. The structure is two-dimensional and consists of seven hydrogen peroxide molecules; one Ba2Cu2O9 sheet oriented in the (0, 0, 1) direction; and one BaCuO4 sheet oriented in the (0, 0, 1) direction. In the Ba2Cu2O9 sheet, there are four inequivalent Ba sites. In the first Ba site, Ba is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ba–O bond distances ranging from 2.67–2.82 Å. In the second Ba site, Ba is bonded in a 6-coordinate geometry to nine O atoms. There are a spread of Ba–O bond distances ranging from 2.61–3.49 Å. In the third Ba site, Ba is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ba–O bond distances ranging from 2.63–3.22 Å. In the fourth Ba site, Ba is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ba–O bond distances ranging from 2.61–2.90 Å. There are four inequivalent Cu sites. In the first Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.79–1.81 Å. In the second Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.77–2.03 Å. In the third Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.78–1.97 Å. In the fourth Cu site, Cu is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.77–1.90 Å. There are eighteen inequivalent O sites. In the first O site, O is bonded in a distorted trigonal planar geometry to two Ba and one Cu atom. In the second O site, O is bonded in a single-bond geometry to one Ba and one O atom. The O–O bond length is 1.23 Å. In the third O site, O is bonded in a trigonal non-coplanar geometry to two Ba and one Cu atom. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the fifth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the sixth O site, O is bonded in a 1-coordinate geometry to two Ba, one Cu, and one O atom. The O–O bond length is 1.40 Å. In the seventh O site, O is bonded in a single-bond geometry to one O atom. In the eighth O site, O is bonded in a 1-coordinate geometry to one Ba, one Cu, and one O atom. The O–O bond length is 1.38 Å. In the ninth O site, O is bonded in a 3-coordinate geometry to two Ba and one Cu atom. In the tenth O site, O is bonded in a single-bond geometry to one Ba and one Cu atom. In the eleventh O site, O is bonded in a 3-coordinate geometry to two Ba and one Cu atom. In the twelfth O site, O is bonded in a 2-coordinate geometry to two Ba, one Cu, and one O atom. In the thirteenth O site, O is bonded in a distorted single-bond geometry to two Ba and one Cu atom. In the fourteenth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the fifteenth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the sixteenth O site, O is bonded in a 1-coordinate geometry to two Ba, one Cu, and one O atom. In the seventeenth O site, O is bonded in a 1-coordinate geometry to two Ba and one Cu atom. In the eighteenth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the BaCuO4 sheet, there are four inequivalent Ba sites. In the first Ba site, Ba is bonded in a 8-coordinate geometry to eight O atoms. There are a spread of Ba–O bond distances ranging from 2.67–2.95 Å. In the second Ba site, Ba is bonded in a 5-coordinate geometry to six O atoms. There are a spread of Ba–O bond distances ranging from 2.56–3.25 Å. In the third Ba site, Ba is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ba–O bond distances ranging from 2.62–2.84 Å. In the fourth Ba site, Ba is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Ba–O bond distances ranging from 2.60–3.05 Å. There are four inequivalent Cu sites. In the first Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.78–1.82 Å. In the second Cu site, Cu is bonded in a 4-coordinate geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.76–1.92 Å. In the third Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.78–1.82 Å. In the fourth Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.78–1.83 Å. There are sixteen inequivalent O sites. In the first O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the second O site, O is bonded in a distorted single-bond geometry to one Ba and one Cu atom. In the third O site, O is bonded in a 1-coordinate geometry to two Ba and one Cu atom. In the fourth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the fifth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the sixth O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the seventh O site, O is bonded in a distorted single-bond geometry to two Ba and one Cu atom. In the eighth O site, O is bonded in a distorted trigonal planar geometry to two Ba and one Cu atom. In the ninth O site, O is bonded in a single-bond geometry to two Ba and one Cu atom. In the tenth O site, O is bonded in a 1-coordinate geometry to one Cu and one O atom. The O–O bond length is 1.35 Å. In the eleventh O site, O is bonded in a distorted trigonal non-coplanar geometry to two Ba and one Cu atom. In the twelfth O site, O is bonded in a 1-coordinate geometry to one Ba, one Cu, and one O atom. In the thirteenth O site, O is bonded in a 1-coordinate geometry to two Ba and one Cu atom. In the fourteenth O site, O is bonded in a distorted single-bond geometry to two Ba and one Cu atom. In the fifteenth O site, O is bonded in a 1-coordinate geometry to two Ba and one Cu atom. In the sixteenth O site, O is bonded in a trigonal non-coplanar geometry to two Ba and one Cu atom.