Metal-Centered Photoluminescence of Eu3+ and Tb3+ Coordination Polymers with Dianions of Camphoric and Tetrafluoroterephthalic Acids

It was shown that coordination polymers [Ln(Camph)(NO3)(MeOH)2]n (1Ln, Ln – Eu, Tb; Camph2––camphorate dianion) and [Ln2(tFbdc)3(DMF)2(H2O)2]n (2Ln, Ln – Eu, Tb; tFbdc2–– tetrafluoroterephtalate dianion) possess metal-centered emission with quantum yields up to 40% under UV-irradiation. It was found that tetrafluoroterephtalate dianion is better antenna ligand than camphorate dianion. It was assumed that for studied complexes the vibrational radiationless deactivation of excited states of ligands influence more significantly on the luminescence characteristics than energy of triplet states of ligands.