Crystal structure of 1,2-di(1-(thiophen-2-yl)ethanone)hydrazine, C12H12N2S2

Abstract

Source of materialAll commercially available reagents were used as supplied. A mixture of the hydrazine hydrate (0.1 mol, 5g), and 1-(thiophen-2-yl)ethanone (0.2 mol, 53.6 g) was stirred in refluxing ethanol (30 ml) for 5hthen the resulting precipitate was collected by filtration, washed several times with ethanol and dried in vacuo (yield 86 %). Aethanol solution was slowly evaporated and colorless block crystals were obtained after one week. Chemical analysis -found: C, 58.04 %; H, 4.92 %; N, 11.26 %; calculated for C 12 H 12 N 2 S 2 :C,58.02 %; H, 4.88 %; N, 11.28 %. DiscussionSchiff bases have received considerable attention in the literature. They are attractive from several points of view, e.g., for analytical application [1]. The dihedral angle formed by the plane of thiophene ring and the plane (N1, C5, C6, N1a, C5a and C6a) is 3.35°indicating their coplanarity. The relatively short N1-C5 bond length 1.297(2) Å suggests its double bond character. The distance of N1-N1 (1.400(2) Å)i ss imilar to the distance of reported values, e.g., 1.415(3) Å for similar hydrazine derivative [2]. The thiophen group is disordered over two sites, with relatives occupancies 0.809(1) and 0.197(1).