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Two independent mol­ecules (A and B) comprises the asymmetric unit of the title ester, C17H20OS. The phenyl ring is inclined with respect to the thio­carboxyl group, forming dihedral angles of 58.95 (6) (in mol­ecule A) and 62.28 (6)° (in mol­ecule B). In each independent mol­ecule, one adamantyl methyl­ene C atom is nearly coplanar with the thio­carboxyl group. The major difference between mol­ecules A and B relates to the relationship between the S atom and the coplanar adamantyl methyl­ene C atom [Ca—Cq—Cc—S torsion angles = 178.25 (8) and 6.81 (13)°, respectively; Ca = adamantyl methyl­ene C atom, Cq = quaternary C atom and Cc = carbonyl C atom], whereby the S atom in mol­ecule A has an anti relationship with the methyl­ene C atom and in mol­ecule B, the S atom is syn. In the crystal, C—H...π inter­actions are formed leading to supra­molecular layers in the ac plane.

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In the title compound, C10H7N3OS2, the 16 non-H atoms are almost planar (r.m.s. deviation = 0.037 Å) and the S-bound methyl group is syn to the ketone O atom. In the crystal, centrosymmetrically related mol­ecules are connected by pairs of C—H...O inter­actions between the ketone O and methyl H atoms. The dimeric aggregates are connected into a linear supra­molecular chain along the b axis via π–π inter­actions occurring between the five-membered and benzene rings [centroid–centroid distance = 3.6123 (9) Å]. The chains assemble into layers in the bc plane via S...S inter­actions involving the endocyclic S atoms [S...S = 3.4607 (6) and 3.4792 (6) Å].
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