Investigations on (C6H9N2)2[MIIBr4] halogenometallate complexes with MII = Co, Cu and Zn: Crystal structure, thermal behavior and magnetic properties

Publication date: 5 December 2017
Source:Journal of Alloys and Compounds, Volume 726
Author(s): Souad Dgachi, Assila Maatar Ben Salah, Mark M. Turnbull, Thierry Bataille, Houcine Naïli
Three complexes with the general formula (C6H9N2)2[M^IIBr4] with M^II = Cu (1), Co (2) and Zn (3) have been grown by the slow evaporation method at room temperature. These compounds were subjected to the following characterization techniques: single crystal X-ray diffraction, thermal analysis (ATG-TD), In situ X-ray powder diffraction and temperature dependent magnetic susceptibility measurements. The crystals of (C6H9N2)2[CuBr4] belong to the triclinic P1¯ space group, whereas (C6H9N2)2[CoBr4] and (C6H9N2)2[ZnBr4] crystallize in the orthorhombic system with the Pbcn space group. Molecular structures of the three coordination compounds consist of [MBr4]^2- anions and 2-amino-6-methylpyridinium cations linked together via non-covalent interactions including hydrogen bonding, π···π stacking and halogen···halogen interactions which lead to three-dimensional supramolecular architecture. The thermal decomposition of the copper compound reveals the slow crystallization of CuBr at 130 °C. Both compounds 1 and 2 exhibit weak antiferromagnetic interactions.

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