(CaRe(H2O3)2)2Cl2 crystallizes in the orthorhombic Cmcm space group. The structure consists of four hydrochloric acid atoms inside a CaRe(H2O3)2 framework. In the CaRe(H2O3)2 framework, Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Re(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. H(1) is bonded in a single-bond geometry to one O(3) atom. There are three inequivalent O sites. In the first O site, O(2) is bonded in a linear geometry to one Ca(1) and one Re(1) atom. In the second O site, O(3) is bonded in a water-like geometry to two equivalent Ca(1) and two equivalent H(1) atoms. In the third O site, O(1) is bonded in a linear geometry to one Ca(1) and one Re(1) atom.
(CaRe(H2O3)2)2Cl2 crystallizes in the orthorhombic Cmcm space group. The structure consists of four hydrochloric acid atoms inside a CaRe(H2O3)2 framework. In the CaRe(H2O3)2 framework, Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Ca(1)-O(1) bond lengths are 2.40 Å. Both Ca(1)-O(2) bond lengths are 2.43 Å. All Ca(1)-O(3) bond lengths are 2.61 Å. Re(1) is bonded in a tetrahedral geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Re(1)-O(1) bond lengths are 1.75 Å. Both Re(1)-O(2) bond lengths are 1.75 Å. H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 1.00 Å. There are three inequivalent O sites. In the first O site, O(2) is bonded in a linear geometry to one Ca(1) and one Re(1) atom. In the second O site, O(3) is bonded in a water-like geometry to two equivalent Ca(1) and two equivalent H(1) atoms. In the third O site, O(1) is bonded in a linear geometry to one Ca(1) and one Re(1) atom.