A second crystalline modification of 2-{3-methyl-2-[(2 Z )-pent-2-en-1-yl]cyclo-pent-2-en-1-yl-idene}hydrazinecarbo-thio-amide.

A second crystalline modification of the title compound, C ₁₂ H ₁₉ N ₃ S [common name: cis -jasmone thio-semicarbazone] was crystallized from tetra-hydro-furane at room temperature. There is one crystallographic independent mol-ecule in the asymmetric unit, showing disorder in the cis -jasmone chain [site-occupancy ratio = 0.590 (14):0.410 (14)]. The thio-semicarbazone entity is approximately planar, with the maximum deviation from the mean plane through the N/N/C/S/N atoms being 0.0463 (14) Å [r.m.s.d. = 0.0324 Å], while for the five-membered ring of the jasmone fragment, the maximum deviation from the mean plane through the carbon atoms amounts to 0.0465 (15) Å [r.m.s.d. = 0.0338 Å]. The mol-ecule is not planar due to the dihedral angle between these two fragments, which is 8.93 (1)°, and due to the sp ³ -hybridized carbon atoms in the jasmone fragment chain. In the crystal, the mol-ecules are connected by N-H⋯S and C-H⋯S inter-actions, with graph-set motifs R ₂ ² (8) and R ₂ ¹ (7), building mono-periodic hydrogen-bonded ribbons along [010]. A Hirshfeld surface analysis indicates that the major contributions for the crystal cohesion are H⋯H (67.8%), H⋯S/S⋯H (15.0%), H⋯C/C⋯H (8.5%) and H⋯N/N⋯H (5.6%) [only non-disordered atoms and those with the highest s.o.f. were considered]. This work reports the second crystalline modification of the cis -jasmone thio-semicarbazone structure, the first one being published recently [Orsoni et al. (2020 ▸). Int. J. Mol. Sci. 21 , 8681-8697] with the crystals obtained in ethanol at 273 K.
(© Oliveira et al. 2023.)