Structural determination; vibration study and thermal decomposition of [C5H6N5]2SeO4⋅2H2O

• The structure is built up from tunnels, prolonged following the c-axis.
• The intersection between the organic and inorganic chains is provided by four hydrogen bonds (Three NH…O (T) and one NH…O (W)).
• The thermogram DSC revealed three exothermic peaks.

The present paper reports the chemical synthesis, structure study, thermal analysis, and vibrational properties of new hybrid compound called: bis (adeninium) selenate bihydrates. It is crystallized in the triclinic system with P-1 space group and the following parameters a = 7.804(5) Å; b = 9.686 (5) Å; c = 11.771 (5) Å; α = 84.421(5)°; ß = 77.556(5)°; γ = 81.186 (5)°; Z = 2 and V = 856.7(8) Å3.The structure is built up from tunnels containing all the components of the structure and following to the c axis, linked via three types of hydrogen bonds (NH…O, NH…N and OH…O). The thermal decomposition of precursors studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), indicate the existence of two mass loss region correspond to dehydration and degradation of the title compound, respectively. The existence of vibrational modes correspond to the organic and inorganic groups and water molecular are identified by the IR and Raman spectroscopy in the frequency ranges 400–4000 and 300–1600 cm−1, respectively.

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