A new nickel selenate templated by piperazine: chemical preparation, crystal structure, thermal decomposition, and magnetic properties

作者：Nkhili Nouha Loulou; Rekik Walid^*; Naili Houcine

来源：Monatshefte fur Chemie, 2014, 145(6): 931-936.

DOI：10.1007/s00706-014-1151-7

• Amines
• X-ray structure determination
• Transition metal compounds
• Thermal decomposition
• Magnetic properties

Single crystals of (C4H12N2)[Ni(H2O)(6)](SeO4)(2) were synthesized by the slow evaporation method from an aqueous solution of piperazine hexahydrate, nickel(II) carbonate, and selenic acid. This hybrid compound crystallizes in the monoclinic system, space group P2(1)/c, with the following unit cell parameters: a = 6.0205(2) angstrom, b = 11.1529(3) angstrom, c = 12.1287(3) angstrom, beta = 96.439(3)degrees, V = 809.26(4) angstrom(3) and Z = 2. Its supramolecular structure consists of isolated [Ni(H2O)(6)](2+) and (C4H12N2)(2+) cations and (SeO4)(2-) anions linked together by a three-dimensional hydrogen bond network. The thermal decomposition of the precursor proceeds through three stages, giving rise to nickel oxide. The magnetic measurements show that the title compound is predominantly paramagnetic with weak antiferromagnetic interactions at low temperature.

• 出版日期2014-6