Ca(ReO5)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(14), one O(15), one O(19), one O(20), one O(4), and one O(6) atom. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(18), one O(2), one O(20), one O(3), one O(4), and one O(7) atom. There are four inequivalent Re sites. In the first Re site, Re(1) is bonded in a tetrahedral geometry to one O(13), one O(14), one O(15), and one O(2) atom. In the second Re site, Re(2) is bonded in a tetrahedral geometry to one O(1), one O(11), one O(12), and one O(5) atom. In the third Re site, Re(3) is bonded in a tetrahedral geometry to one O(16), one O(17), one O(18), and one O(3) atom. In the fourth Re site, Re(4) is bonded in a tetrahedral geometry to one O(10), one O(6), one O(8), and one O(9) atom. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ca(1) and one Re(2) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(2) and one Re(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ca(2) and one Re(3) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Ca(1) and one Ca(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Re(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(4) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ca(2) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Re(4) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one Re(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(4) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Ca(2) and one Re(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Ca(2) and one Re(2) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Re(1) atom. In the fourteenth O site, O(14) is bonded in a linear geometry to one Ca(1) and one Re(1) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(1) atom. In the sixteenth O site, O(16) is bonded in a single-bond geometry to one Re(3) atom. In the seventeenth O site, O(17) is bonded in a single-bond geometry to one Re(3) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Ca(2) and one Re(3) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one Ca(1) atom. In the twentieth O site, O(20) is bonded in a water-like geometry to one Ca(1) and one Ca(2) atom.
Ca(ReO5)2 crystallizes in the monoclinic Cc space group. There are two inequivalent Ca sites. In the first Ca site, Ca(1) is bonded in a 8-coordinate geometry to one O(1), one O(10), one O(14), one O(15), one O(19), one O(20), one O(4), and one O(6) atom. The Ca(1)-O(1) bond length is 2.49 Å. The Ca(1)-O(10) bond length is 2.34 Å. The Ca(1)-O(14) bond length is 2.33 Å. The Ca(1)-O(15) bond length is 2.36 Å. The Ca(1)-O(19) bond length is 2.48 Å. The Ca(1)-O(20) bond length is 2.56 Å. The Ca(1)-O(4) bond length is 2.60 Å. The Ca(1)-O(6) bond length is 2.49 Å. In the second Ca site, Ca(2) is bonded in a 8-coordinate geometry to one O(11), one O(12), one O(18), one O(2), one O(20), one O(3), one O(4), and one O(7) atom. The Ca(2)-O(11) bond length is 2.34 Å. The Ca(2)-O(12) bond length is 2.36 Å. The Ca(2)-O(18) bond length is 2.34 Å. The Ca(2)-O(2) bond length is 2.46 Å. The Ca(2)-O(20) bond length is 2.75 Å. The Ca(2)-O(3) bond length is 2.52 Å. The Ca(2)-O(4) bond length is 2.55 Å. The Ca(2)-O(7) bond length is 2.50 Å. There are four inequivalent Re sites. In the first Re site, Re(1) is bonded in a tetrahedral geometry to one O(13), one O(14), one O(15), and one O(2) atom. The Re(1)-O(13) bond length is 1.73 Å. The Re(1)-O(14) bond length is 1.76 Å. The Re(1)-O(15) bond length is 1.76 Å. The Re(1)-O(2) bond length is 1.76 Å. In the second Re site, Re(2) is bonded in a tetrahedral geometry to one O(1), one O(11), one O(12), and one O(5) atom. The Re(2)-O(1) bond length is 1.76 Å. The Re(2)-O(11) bond length is 1.76 Å. The Re(2)-O(12) bond length is 1.76 Å. The Re(2)-O(5) bond length is 1.73 Å. In the third Re site, Re(3) is bonded in a tetrahedral geometry to one O(16), one O(17), one O(18), and one O(3) atom. The Re(3)-O(16) bond length is 1.73 Å. The Re(3)-O(17) bond length is 1.73 Å. The Re(3)-O(18) bond length is 1.76 Å. The Re(3)-O(3) bond length is 1.81 Å. In the fourth Re site, Re(4) is bonded in a tetrahedral geometry to one O(10), one O(6), one O(8), and one O(9) atom. The Re(4)-O(10) bond length is 1.76 Å. The Re(4)-O(6) bond length is 1.81 Å. The Re(4)-O(8) bond length is 1.73 Å. The Re(4)-O(9) bond length is 1.73 Å. There are twenty inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Ca(1) and one Re(2) atom. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(2) and one Re(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Ca(2) and one Re(3) atom. In the fourth O site, O(4) is bonded in a water-like geometry to one Ca(1) and one Ca(2) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Re(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(4) atom. In the seventh O site, O(7) is bonded in a single-bond geometry to one Ca(2) atom. In the eighth O site, O(8) is bonded in a single-bond geometry to one Re(4) atom. In the ninth O site, O(9) is bonded in a single-bond geometry to one Re(4) atom. In the tenth O site, O(10) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(4) atom. In the eleventh O site, O(11) is bonded in a linear geometry to one Ca(2) and one Re(2) atom. In the twelfth O site, O(12) is bonded in a distorted bent 150 degrees geometry to one Ca(2) and one Re(2) atom. In the thirteenth O site, O(13) is bonded in a single-bond geometry to one Re(1) atom. In the fourteenth O site, O(14) is bonded in a linear geometry to one Ca(1) and one Re(1) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Ca(1) and one Re(1) atom. In the sixteenth O site, O(16) is bonded in a single-bond geometry to one Re(3) atom. In the seventeenth O site, O(17) is bonded in a single-bond geometry to one Re(3) atom. In the eighteenth O site, O(18) is bonded in a bent 150 degrees geometry to one Ca(2) and one Re(3) atom. In the nineteenth O site, O(19) is bonded in a single-bond geometry to one Ca(1) atom. In the twentieth O site, O(20) is bonded in a water-like geometry to one Ca(1) and one Ca(2) atom.