Synthesis and structural characterisation of polynuclear cobalt complexes with partially-deprotonated Bis-tris

The synthesis and crystal structures of [Co4Na2(HL)2(H2L)2(MeOH)4] and [Co5(HL)2(H2L)2] are reported as the first examples of polynuclear transition metal complexes assembled using partially-deprotonated Bis-tris {2-[bis(2-hydroxyethyl)amino]-2-(hydroxymethyl)propane-1,3-diol, H5L}.