Intermolecular interactions are important for the understanding of molecular selforganization of new solids with desired physical and chemical properties [1]. In this work crystals of bis[(1-diaminomethylene)thiouron-1-ium] naphthalene-1,5-disulfonate were grown using solution growth technique. A single-crystal sample was characterized by X-ray diffraction and FTIR spectroscopy. The compound crystallizes in centrosymmetric group C2/c of the monoclinic system. The conformations of the cation bis[1-(diaminomethylene)thiouron-1-ium] and the anion naphthalene 1,5-disulfonate are shown in figure 1. Experimental:Commercially available 2-imino-4-thiobiuret, which is in the fact the tautomeric form (schemme 1), 1-(diaminomethylene)thiourea [2] and the 1,5-naphthalenedisulfonic acid tetrahydrate were added to hot water in a molar proportion of 2:1. After several days, transparent colourless crystals were formed. The crystals have been separated by filtration and dried in air. Analysis: Calculated for C14H20N8O6S4: C, 32.05; N, 21.26; O, 18.30; S, 24.45 and H, 3.84%. Found: C, 31.88; N, 21.32; O, 18.63; S, 24.39 and H, 3.78%. A colourless 0.05 mm x 0.02 mm x 0.05 mm sample was mounted on a Gemini Oxford CCD Diffractometer provided with a liquid nitrogen low-temperature device. IR data measured with an ABB Bomen MB 3000 FTIR spectrometer using KBr pellets. Schemme 1: Tautomeric equilibrium forms of 1-(diaminomethylene)thiourea and 2-imino-4-thiobiuret

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