Abstract
The formation conditions and luminescence of heterometallic Tb-Cu complexes with structurally similar podands containing different numbers of oxymethylene fragments were studied (n = 2−7). The component ratio in mono- and different-metal complexes were 1: 1 and 1: 1: 1, respectively. The possibility of complex formation for the carbonyl and enol forms was estimated by molecular mechanics. The results were in good agreement with experimental data. The most pronounced enhancement of luminescence intensity of Tb(III) ions in heterometallic Tb-Cu complexes was observed for podands containing two and three oxymethylene fragments (L1 and L2, respectively) and the probability of complex formation with these podands is higher than with the podands containing four to seven oxymethylene fragments (L3–L5).
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