Fig. 4. View of (a) the crystal structure of MFM-512 along the a-axis; (b) type (I) and (c) type II Ba(ii) nodes in MFM-512 showing distorted octahedral and trigonal prismatic square face monocapped coordination, respectively. H-atoms are omitted for clarity; (d) View of the tetranuclear Ba(ii) cluster in MFM-512. Carbon, grey; oxygen, red; hydrogen, white; barium, magenta (type I) and cyan (type II).
