ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

A new organically templated magnesium sulfate: structure, spectroscopic analysis, and thermal behaviour

Dhouha ben Hassan, Walid Rekik, Houcine Naïli, and Tahar Mhiri

Laboratoire Physico-chimique de l’état Solide, Département de Chimie, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000, Sfax, Tunisie

E-mail: w_rekik@alinto.com

Abstract: A new magnesium sulfate templated by 2-methylpiperazine, (C₅H₁₄N₂)[Mg(H₂O)₆](SO₄)₂, was prepared by the slow evaporation method. The obtained crystals were investigated by the Raman and FTIR spectroscopy and crystallographically characterised by single-crystal X-ray diffraction. The compound crystallises in the monoclinic system, space group P2₁/n. Supramolecular network of this hybrid material consists of Mg²⁺ cations octahedrally coordinated by six water molecules, sulfate tetrahedra and protonated and disordered diamine linked together by two types of hydrogen bonds: OW—H…O and N—H…O. Dehydration of the title compound takes place in three steps. Thermal decomposition of the anhydrous phase consists in the loss of the organic moiety and one sulfate group leading to the formation of magnesium sulfate.

Keywords: amine magnesium sulfate – supramolecular network – crystal structure – thermal decomposition – dehydration

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0432-7

Chemical Papers 68 (2) 210–216 (2014)