Recently, there has been growing interest in the photo-
chemistry of luminescent Zn(ii) and Cd(ii) coordination
complexes in the forms of monomeric,[1,2] multinuclear,[3-12]
and polymeric species (Tables 1 and 2).[2,13-20] As colourless
d10 metal ions, Zn(ii) and Cd(ii) can assume coordination
geometries from tetrahedral through trigonal-bipyramidal
and square-pyramidal to octahedral, hence are suitable for
the construction of luminescent coordination complexes.