Crystal structure, thermal analysis and magnetic properties of the bis(2-amino-5-ammoniopyridinium) hexachloridomanganate(II)

Single crystals of the novel Bis(2-amino-5-ammoniopyridinium) hexachloridomanganate(II), (C5H9N3)2MnCl6, 1, were grown by slow evaporation solution technique at room temperature. The compound was characterised by IR, differential thermal analysis (TG-DTA), single crystal X-ray diffraction and temperature dependent magnetic susceptibility. The structure consists of isolated [MnCl6]2− octahedral anions and 2-Amino-5-ammoniopyridinium [C5H9N3]+ cations, 2-A-apy, which are connected together via C/N–H⋯Cl hydrogen bonds. Cation…cation, offset-face-to-face interactions (π–π stacking) between identical antiparallel 2-A-apy cations and cation…anion, C/N–H⋯Cl hydrogen bonding cause to the formation of a three-dimensional supramolecular architecture, in which they may be effective in the stabilization of the crystal structure. The magnetic data show that this material display weak antiferromagnetic coupling on cooling, without any transition observed above 1.8 K. Antiferromagnetic properties might be attributed to exchange coupling mediated by the semi-coordinate Mn⋯Cl bonds.

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