Crystal structures of two substituted thia­zolidine derivatives

In the first of the compounds reported herein, namely 6′-ferrocenyl-6a′-nitro-6′,6a′,6b′,7′,9′,11a′-hexa­hydro-2H-spiro­[ace­naphthyl­ene-1,11′-chromeno[3′,4′:3,4]pyrrolo­[1,2-c]thia­zol]-2-one, [Fe(C5H5)(C29H21N2O4S)], (I), the thia­zolidine ring adopts a twist conformation on the methine N—C atoms. In the second compound, viz. 6′-(4-methoxy­phen­yl)-6a′-nitro-6′,6a′,6b′,7′,9′,11a′-hexa­hydro-2H-spiro­[ace­naphthyl­ene-1,11′-chromeno[3′,4′:3,4]pyrrolo­[1,2-c]thia­zol]-2-one, [Fe(C5H5)(C26H19N2O5S)], (II), the thia­zolidine ring adopts an envelope conformation with a methine C atom as the flap. In both compounds, the pyrrolidine ring adopts a twist conformation on the thia­zolidine and tetra­hydro­pyran C atoms. The mean planes of the thia­zolidine and pyrrolidine rings subtend angles of 67.30 (1) and 62.95 (7)° in (I) and (II), respectively, while the mean plane of the pyrrolidine ring makes dihedral angles of 76.53 (1) and 87.74 (7)° with the ace­naphthyl­ene ring system in (I) and (II), respectively. In both compounds, an intra­molecular C—H⋯O hydrogen bond forms an S(7) ring motif. In the crystal of (I), mol­ecules are linked via two different C—H⋯O hydrogen bonds, forming chains along [001] and [100]. In (II), they are linked through C—H⋯O hydrogen bonds, forming dimers with an R22(10) ring motif while C—H⋯π inter­actions link the mol­ecules in a head-to-tail fashion, forming chains along the a-axis direction.