Fig. 3. View of (a) the crystal structure in MFM-511 along the a-axis, highlighting restrictive hydrogen bonding of carboxyl proton (a = 1.79 Å); (b) the Ba(ii) metal node in MFM-511 showing monocapped square antiprismatic coordinate geometry; (c) the binuclear Ba(ii) moiety in MFM-511 viewed along the a-axis. Carbon, grey; oxygen, red; hydrogen, white; nitrogen, blue; barium, teal.
