Crystal structures of two substituted thiazolidine derivatives

Abstract

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.