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Ca19(Cu12O23)2 crystallizes in the triclinic P1 space group. The structure is three-dimensional. there are nineteen inequivalent Ca sites. In the first Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.28–2.38 Å. In the second Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.29–2.86 Å. In the third Ca site, Ca is bonded to six O atoms to form distorted edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.33–2.60 Å. In the fourth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.43 Å. In the fifth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.35–2.40 Å. In the sixth Ca site, Ca is bonded to six O atoms to form distorted edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.49 Å. In the seventh Ca site, Ca is bonded in a 4-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.30–2.95 Å. In the eighth Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.64 Å. In the ninth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.31–2.47 Å. In the tenth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.28–2.44 Å. In the eleventh Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.33–2.65 Å. In the twelfth Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.64 Å. In the thirteenth Ca site, Ca is bonded to six O atoms to form distorted edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.28–2.44 Å. In the fourteenth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.35–2.41 Å. In the fifteenth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.33–2.44 Å. In the sixteenth Ca site, Ca is bonded in a 6-coordinate geometry to six O atoms. There are a spread of Ca–O bond distances ranging from 2.32–2.64 Å. In the seventeenth Ca site, Ca is bonded in a 4-coordinate geometry to eight O atoms. There are a spread of Ca–O bond distances ranging from 2.31–2.97 Å. In the eighteenth Ca site, Ca is bonded to six O atoms to form distorted edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.32–2.50 Å. In the nineteenth Ca site, Ca is bonded to six O atoms to form edge-sharing CaO6 octahedra. There are a spread of Ca–O bond distances ranging from 2.35–2.38 Å. There are twenty-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 1.92–2.02 Å. In the second Cu site, Cu is bonded in a T-shaped geometry to three O atoms. There are a spread of Cu–O bond distances ranging from 1.83–2.02 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 1.85–1.88 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 1.96–2.02 Å. In the fifth 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 1.94–2.00 Å. In the sixth 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 1.87–1.92 Å. In the seventh Cu site, Cu is bonded in a square co-planar geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.85–1.88 Å. In the eighth Cu site, Cu is bonded in a square co-planar geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.89–1.96 Å. In the ninth Cu site, Cu is bonded in a T-shaped geometry to three O atoms. There are a spread of Cu–O bond distances ranging from 1.85–2.06 Å. In the tenth 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 1.87–1.90 Å. In the eleventh Cu site, Cu is bonded in a T-shaped geometry to three O atoms. There are a spread of Cu–O bond distances ranging from 1.82–1.98 Å. In the twelfth Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There is three shorter (1.91 Å) and one longer (1.92 Å) Cu–O bond length. In the thirteenth 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 1.92–2.10 Å. In the fourteenth Cu site, Cu is bonded in a square co-planar geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.98–2.00 Å. In the fifteenth 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 1.93–1.98 Å. In the sixteenth Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There is two shorter (1.89 Å) and two longer (1.90 Å) Cu–O bond length. In the seventeenth 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 1.86–1.90 Å. In the eighteenth Cu site, Cu is bonded in a rectangular see-saw-like geometry to four O atoms. There is three shorter (1.90 Å) and one longer (1.91 Å) Cu–O bond length. In the nineteenth 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 1.88–1.94 Å. In the twentieth Cu site, Cu is bonded in a square co-planar geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.97–2.01 Å. In the twenty-first Cu site, Cu is bonded in a T-shaped geometry to three O atoms. There are a spread of Cu–O bond distances ranging from 1.83–2.05 Å. In the twenty-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 1.95–1.99 Å. In the twenty-third Cu site, Cu is bonded in a square co-planar geometry to four O atoms. There are a spread of Cu–O bond distances ranging from 1.92–1.94 Å. In the twenty-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 1.93–2.01 Å. There are forty-six inequivalent O sites. In the first O site, O is bonded to two Ca and two Cu atoms to form OCa2Cu2 tetrahedra that share a cornercorner with one OCa3Cu2 square pyramid, a cornercorner with one OCa2Cu2 tetrahedra, corners with two equivalent OCa3Cu2 trigonal bipyramids, and an edgeedge with one OCa3Cu2 square pyramid. In the second O site, O is bonded in a distorted rectangular see-saw-like geometry to two Ca and two Cu atoms. In the third O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the fourth O site, O is bonded in a 5-coordinate geometry to three Ca and two Cu atoms. In the fifth O site, O is bonded to three Ca and two Cu atoms to form a mixture of distorted edge and corner-sharing OCa3Cu2 square pyramids. In the sixth O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 trigonal bipyramids that share corners with four OCa3Cu2 square pyramids, a cornercorner with one OCa2Cu2 tetrahedra, an edgeedge with one OCa3Cu2 square pyramid, and an edgeedge with one OCa3Cu2 trigonal bipyramid. In the seventh O site, O is bonded in a 5-coordinate geometry to three Ca and two Cu atoms. In the eighth O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the ninth O site, O is bonded in a 4-coordinate geometry to two Ca and two Cu atoms. In the tenth O site, O is bonded in a rectangular see-saw-like geometry to two Ca and two Cu atoms. In the eleventh O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the twelfth O site, O is bonded in a 4-coordinate geometry to three Ca and two Cu atoms. In the thirteenth O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the fourteenth O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 trigonal bipyramids that share a cornercorner with one OCa3Cu2 square pyramid, corners with two equivalent OCa2Cu2 tetrahedra, and edges with two OCa3Cu2 square pyramids. In the fifteenth O site, O is bonded in a 5-coordinate geometry to three Ca and two Cu atoms. In the sixteenth O site, O is bonded to three Ca and two Cu atoms to form a mixture of distorted edge and corner-sharing OCa3Cu2 trigonal bipyramids. In the seventeenth O site, O is bonded to three Ca and two Cu atoms to form OCa3Cu2 square pyramids that share corners with three OCa3Cu2 trigonal bipyramids, edges with two OCa3Cu2 square pyramids, an edgeedge with one OCa2Cu2 tetrahedra, and an edgeedge with one OCa3Cu2 trigonal bipyramid. In the eighteenth O site, O is bonded in a 5-coordinate geometry to three Ca and two Cu atoms. In the nineteenth O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 square pyramids that share corners with four OCa3Cu2 square pyramids, corners with two equivalent OCa2Cu2 tetrahedra, and edges with three OCa3Cu2 square pyramids. In the twentieth O site, O is bonded to two Ca and two Cu atoms to form a mixture of distorted edge and corner-sharing OCa2Cu2 tetrahedra. In the twenty-first O site, O is bonded to two Ca and two Cu atoms to form a mixture of distorted edge and corner-sharing OCa2Cu2 tetrahedra. In the twenty-second O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the twenty-third O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the twenty-fourth O site, O is bonded in a 5-coordinate geometry to three Ca and two Cu atoms. In the twenty-fifth O site, O is bonded in a distorted see-saw-like geometry to two Ca and two Cu atoms. In the twenty-sixth O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 square pyramids that share a cornercorner with one OCa3Cu2 square pyramid, a cornercorner with one OCa3Cu2 trigonal bipyramid, an edgeedge with one OCa3Cu2 square pyramid, an edgeedge with one OCa2Cu2 tetrahedra, and an edgeedge with one OCa3Cu2 trigonal bipyramid. In the twenty-seventh O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 square pyramids that share corners with three OCa3Cu2 square pyramids, an edgeedge with one OCa3Cu2 square pyramid, an edgeedge with one OCa2Cu2 tetrahedra, and edges with two OCa3Cu2 trigonal bipyramids. In the twenty-eighth O site, O is bonded to three Ca and two Cu atoms to form OCa3Cu2 square pyramids that share corners with three OCa3Cu2 square pyramids, corners with two OCa2Cu2 tetrahedra, corners with two equivalent OCa3Cu2 trigonal bipyramids, and edges with three OCa3Cu2 square pyramids. In the twenty-ninth O site, O is bonded to three Ca and two Cu atoms to form a mixture of distorted edge and corner-sharing OCa3Cu2 trigonal bipyramids. In the thirtieth O site, O is bonded in a 4-coordinate geometry to three Ca and two Cu atoms. In the thirty-first O site, O is bonded to three Ca and two Cu atoms to form distorted OCa3Cu2 square pyramids that share corners with four OCa3Cu2 square pyramids, edges with two OCa3Cu2 square pyramids,

36 MATERIALS SCIENCE↗