Crystal structures of two (Z)-2-(4-oxo-1,3-thia­zolidin-2-yl­idene)acetamides

The crystal structures of two (oxo­thia­zolidin-2-yl­idene)acetamides, namely (Z)-2-[2-(morpholin-4-yl)-2-oxo­ethyl­idene]thia­zolidin-4-one, C(9)H(12)N(2)O(3)S, (I), and (Z)-N-(4-meth­oxy­phen­yl)-2-(4-oxo­thia­zolidin-2-yl­idene)acetamide, C(12)H(12)N(2)O(3)S, (II), are described and compared with a related structure. The Z conformation was observed for both the compounds. In (I), the morpholin-4-yl ring has a chair conformation and its mean plane is inclined to the thia­zolidine ring mean plane by 37.12 (12)°. In (II), the benzene ring is inclined to the mean plane of the thia­zolidine ring by 20.34 (14)°. In the crystal of (I), mol­ecules are linked by N—H⋯O hydrogen bonds, forming C(6) chains along the b-axis direction. The edge-to-edge arrangement of the mol­ecules results in short C—H⋯O and C—H⋯S inter­actions, which consolidate the chain into a ribbon-like structure. In the crystal of (II), two N—H⋯O hydrogen bonds result in the formation of C(8) chains along the b-axis direction and C(6) chains along the c-axis direction. The combination of these inter­actions leads to the formation of layers parallel to the bc plane, enclosing R (4) (4)(28) rings involving four mol­ecules.