Fig. 2: Single-crystal X-ray structures of metal-containing complexes of L.

a [LZn]2+. b [LMn(H2O)2]2+. c [L2Zn3(SO4)]4+. d [L2Zn3(SO4)]4+. e [L2Mn3(H2O)2(SO4)]4+. f [L2Mn3(H2O)2(SO4)]4+. Colour code: dark blue, Zn(II); purple, Mn; red, O; blue, N; yellow, S; grey, C (apart from 2d and 2f where the ligand strands have been coloured for clarity).