Crystal structure, phase transition and thermal behaviour of dabcodiium hexaaquacopper(II) bis(sulfate), (C6H14N2)[Cu(H2O)6](SO4)2

A new organically templated metal sulfate has been synthesized and characterized. At room temperature, dabcodiium hexaaquacopper(II) bis(sulfate), (C6H14N2)[Cu(H2O)6](SO4)2 crystallizes in the monoclinic symmetry (space group P21/n) with the following unit cell parameters: a = 6.9533(2), b = 12.5568(2), c = 9.9434(2) Å; β = 90.526(1)° and Z = 2. Its crystal structure is built from isolated [Cu(H2O)6]2+, SO42- and disordered C6H14N22+ ions linked together by a hydrogen-bonding network. The title compound undergoes a reversible phase transition of the first-order type at 265.7/281.8 K on heating–cooling runs. Below the phase transition temperature, the structure is fully ordered.

Graphical abstractA new transition metal sulfate in the presence of dabco amine, (C6H14N2)[Cu(H2O)6](SO4)2, has been prepared and characterized. The structural arrangement is pointed out, in which dabco plays a templating role. A structural phase transition is highlighted at low temperature and the thermal decomposition of the precursor, at high temperature, is discussed.Figure optionsDownload full-size imageDownload as PowerPoint slide