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Syntheses and crystal structures of two magnesium-tetrazole compounds in salt and polymeric forms

Abstract : Two alkaline earth-tetrazole compounds, namely catena-poly[[[triaquamagnesium(II)]―5,5-(azanediyl)ditetrazolato- N-3(1),N-1:N-5] hemi\bis[-5,5-(azanediyl)ditetrazolato-N-3(1),N-1:N-2]bis[triaquama gnesium(II)]\ monohydrate], \[Mg(C2HN9)(H2O)(3)][Mg-2(C2HN9)(2)(H2O)(6)](0.5)H2O\(n), (I), and bis[5-(pyrazin-2-yl)tetrazolate] hexaaquamagnesium(II), (C5H3N6)[Mg(H2O)(6)], (II), have been prepared under hydrothermal conditions. Compound (I) is a mixed dimer-polymer based on magnesium ion centres and can be regarded as the first example of a magnesium-tetrazolate polymer in the crystalline form. The structure shows a complex three-dimensional hydrogen-bonded network that involves magnesium-tetrazolate dimers, solvent water molecules and one-dimensional magnesium-tetrazolate polymeric chains. The intrinsic cohesion in the polymer chains is ensured by NH...N hydrogen bonds, which form R-2(2)(7) rings, thus reinforcing the propagation of the polymer chain along the a axis. The crystal structure of magnesium tetrazole salt (II) reveals a mixed ribbon of hydrogen-bonded rings, of types R-2(2)(7), R-2(2)(9) and R-2(4)(10), running along the c axis, which are linked by R-2(4)(16) rings, generating a 4,8-c flu net.
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Mohamed Abdellatif Bensegueni, Aouatef Cherouana, Slimane Dahaoui. Syntheses and crystal structures of two magnesium-tetrazole compounds in salt and polymeric forms. Acta Crystallographica Section C : Crystal Structure Communications [1968-2013], International Union of Crystallography, 2015, 71 (3), pp.222+. ⟨10.1107/S2053229615002727⟩. ⟨hal-01521902⟩



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