<em>N</em>-Methyl-2-{3-methyl-2-[(2Z)-pent-2-en-1-yl]-cyclopent-2-en-1-ylidene}hydrazinecarbothioamide

Abstract

The equimolar and hydrochloric acid-catalysed reaction between <em>cis</em>-jasmone and 4-methylthiosemicarbazide in ethanolic solution yields the title compound, C₁₃H₂₁N₃S (common name: <em>cis</em>-jasmone 4-methylthiosemicarbazone). Two molecules with all atoms in general positions are present in the asymmetric unit. In one of them, the carbon chain is disordered [site occupancy ratio = 0.821 (3):0.179 (3)]. The thiosemicarbazone entities [N—N—C(=S)—N] are approximately planar, with the maximum deviation from the mean plane through the selected atoms being −0.0115 (16) Å (r.m.s.d. = 0.0078 Å) for the non-disordered molecule and 0.0052 (14) Å (r.m.s.d. = 0.0031 Å) for the disordered one. The molecules are not planar, since the jasmone groups have a chain with <em>sp</em>³-hybridized carbon atoms and, in addition, the thiosemicarbazone fragments are attached to the respective carbon five-membered rings and the dihedral angles between them for each molecule amount to 8.9 (1) and 6.3 (1)°. In the crystal, the molecules are connected through pairs of N—H&sdot;&sdot;&sdot;S and C—H&sdot;&sdot;&sdot;S interactions into crystallographically independent centrosymmetric dimers, in which rings of graph-set motifs R²₂(8) and R²₁(7) are observed. A Hirshfeld surface analysis indicates that the major contributions for the crystal cohesion are from H&sdot;&sdot;&sdot;H (70.6%), H&sdot;&sdot;&sdot;S/S&sdot;&sdot;&sdot;H (16.7%), H&sdot;&sdot;&sdot;C/C&sdot;&sdot;&sdot;H (7.5%) and H&sdot;&sdot;&sdot;N/N&sdot;&sdot;&sdot;H (4.9%) interactions [considering the two crystallographically independent molecules and only the disordered atoms with the highest s.o.f. for the evaluation].