The complexes [ML2]n+(Mn+= Fe2+, Co2+, Co3+, Cu2+and Ag+), [PdCl2L] and [CuI(L)] are described. [AgL2]+is an unusual square planar silver(i) centre (left). Exposure of [CuI(L)] to air affords mono- or dinuclear copper(ii)/carbonato products. Two of the copper complexes form crystalline hydrates with complicated hydrogen bond networks (right).