Abstract
In the present study, the acentric crystal structure of the title compound was expected from the incorporation of an enantiomerically pure chiral amine [
S-2-methylpiperazine] used in the synthesis.
The directed synthesis of a new organically templated copper sulfate has been achieved through the use of chiral organic amine. Reaction containing
S-2-methylpiperazine, CuSO
4·5H
2O, H
2SO
4 and H
2O were subjected to the slow evaporation conditions, resulting in the growth of single crystals of [(
S)-C
5H
14N
2][Cu(SO
4)
2(H
2O)
4]·(H
2O)
2. At room temperature, it crystallises in the non-centrosymmetric space group
P2
1,
Z
=
2,
a
=
7.5583(5),
b
=
10.1721(6),
c
=
10.7974(7)
Å,
β
=
94.425(4)° and
V
=
827.67(9)
Å
3. The structure consists of trimeric units [Cu(SO
4)
2(H
2O)
4]
2−, [(
S)-C
5H
14N
2]
2+ cations and free water molecules, donating hydrogen bonds that stabilize the three-dimensional structure and filling space. The title compound undergoes a reversible phase transition of first-order, which is detected by differential-scanning calorimetry at 347.2
K in the heating cycle and at 318.9
K in the cooling cycle. The evolution of the dielectric constant as a function of frequency and temperature revealed this transition to be ferro-paraelectric. Thermogravimetric analyses indicate that its decomposition proceeds through three stages giving rise to the copper oxide.