Abstract
Single crystals of [(R)-C5H14N2][Cu(SO4)(2)(H2O)(4)]center dot 2H(2)O (1) were grown through the slow evaporation of a solution containing H2SO4, (R)-C5H12N2 and CuSO4 center dot 5H(2)O. These crystals spontaneously transform to [(R)-C5H14N2](2)[Cu(H2O)(6)](SO4)(3) (2) over the course of four days at room temperature. The same single crystal on the same mounting was used for the determination of the structure of (1) and the unit cell determination of (2). A second single crystal of the transformed batch has served for the structural determination of (2). Compound 1 crystallizes in the noncentrosymmetric space group P2(1) (No. 4) and consists of trimeric [Cu(SO4)(2)(H2O)(4)](2-) anions, [(R)-C5H14N2](2+) cations and occluded water molecules. Compound 2 crystallizes in P2(1)2(1)2 (No. 18) and contains [Cu(H2O)(6)](2+) cations, [SO4](2-) anions and occluded water molecules. The thermal decompositions of compounds 1 and 2 were studied by thermogravimetric analyses and temperature-dependent X-ray diffraction.