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Ba2ZrC8O19 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are four inequivalent Ba2+ sites. In the first Ba2+ site, Ba2+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.78–3.11 Å. In the second Ba2+ site, Ba2+ is bonded in a 11-coordinate geometry to eleven O2- atoms. There are a spread of Ba–O bond distances ranging from 2.78–3.12 Å. In the third Ba2+ site, Ba2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–2.73 Å. In the fourth Ba2+ site, Ba2+ is bonded in a distorted hexagonal planar geometry to six O2- atoms. There are a spread of Ba–O bond distances ranging from 2.69–2.72 Å. There are two inequivalent Zr2+ sites. In the first Zr2+ site, Zr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Zr–O bond distances ranging from 2.18–2.27 Å. In the second Zr2+ site, Zr2+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Zr–O bond distances ranging from 2.18–2.27 Å. There are sixteen inequivalent C4+ sites. In the first C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the second C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the third C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the fourth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the fifth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the sixth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the seventh C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the eighth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.24 Å) and one longer (1.29 Å) C–O bond length. In the ninth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. In the tenth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. In the eleventh C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. In the twelfth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. In the thirteenth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. In the fourteenth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. In the fifteenth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. In the sixteenth C4+ site, C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.26 Å) and one longer (1.28 Å) C–O bond length. There are thirty-eight inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ and one C4+ atom. In the second O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ and one C4+ atom. In the third O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ and one C4+ atom. In the fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ and one C4+ atom. In the fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the sixth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the eighth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the ninth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+, one Zr2+, and one C4+ atom. In the tenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+, one Zr2+, and one C4+ atom. In the eleventh O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+, one Zr2+, and one C4+ atom. In the twelfth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+, one Zr2+, and one C4+ atom. In the thirteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the fourteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the fifteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the sixteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the seventeenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the eighteenth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the nineteenth O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twentieth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twenty-first O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twenty-second O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twenty-third O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twenty-fourth O2- site, O2- is bonded in a bent 120 degrees geometry to one Zr2+ and one C4+ atom. In the twenty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the twenty-sixth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the twenty-seventh O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the twenty-eighth O2- site, O2- is bonded in a distorted single-bond geometry to two Ba2+ and one C4+ atom. In the twenty-ninth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and one C4+ atom. In the thirtieth O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and one C4+ atom. In the thirty-first O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and one C4+ atom. In the thirty-second O2- site, O2- is bonded in a distorted bent 120 degrees geometry to one Ba2+ and one C4+ atom. In the thirty-third O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ atom. In the thirty-fourth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ atom. In the thirty-fifth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ atom. In the thirty-sixth O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ atom. In the thirty-seventh O2- site, O2- is bonded in a distorted single-bond geometry to one Ba2+ atom. In the thirty-eighth O2- site, O2- is bonded in a single-bond geometry to one Ba2+ atom.

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