organic compounds
Open access
In the title compound, C22H21ClO2, the oxolane ring adopts a twisted conformation. The dihedral angles between the mean plane of the oxolane ring and the mean planes of the 4-chlorophenyl, phenyl and cyclopentenyl rings are 71.81 (18), 76.9 (18) and 82.08 (18)°, respectively.
metal-organic compounds
Open access
The asymmetric unit of the title complex, [Co(C5H5N3O)2(H2O)2](NO3)2, contains one half of a CoII cationic unit and a nitrate anion. The entire [Co(C5H5N3O)2(H2O)2]2+ cationic unit is completed by the application of inversion symmetry at the CoII site, generating a six-coordinate distorted octahedral environment for the metal ion. The chelating pyrazine-2-carboxamide molecules are bound to cobalt via N and O atoms, forming a square plane, while the remaining two trans positions in the octahedron are occupied by two coordinated water molecules.