Figure 4
A portion of the structure of (II), depicting the short hydrogen bonds between carboxyl groups of the (cdoH)− group. Atoms H2 and H6 are at half-occupancy and are disordered with respect to centres of symmetry. [Symmetry codes: (′) −x + 2, −y + 2, −z; (′′) −x + 1, −y + 1, −z + 1.] |