Add time:07/30/2019         Source:sciencedirect.com

Three 1D-coordination networks namely {[Ln(L)(DMF)(H2O)]·DMF}n. represented as EuL, GdL and TbL were obtained using the synthetized 4,4′,4″-((benzene-1,3,5-triyltris(methylene))tris(oxy))tribenzoic acid (H3L) as a ligand and lanthanide nitrate salts (Ln(NO3)3) (Ln = EuIII, GdIII or TbIII). The reactions were carried out under solvothermal conditions using a mixture of DMF and H2O. Single crystal X-ray analyses revealed that all three compounds are isostructural crystalizing in the triclinic space group P1-. They show an interesting binodal connected one-dimensional structure, with a static crystal disorder due to the different spatial orientations of DMF molecules. The triplet state energy of the H3L ligand obtained from {[Gd(L)(DMF)(H2O)]·DMF}n lies energetically above the main emitting states of both EuIII and TbIII. The photophysical properties were investigated in terms of excitation, emission spectra and emission lifetime at three different temperatures. EuL and TbL exhibit characteristic emission bands of the EuIII and TbIII with emission lifetimes of 0.51 ms and 0.90 ms, respectively. The emission lifetime values of EuL and TbL remain practically constant in the temperature range from 77 to 300 K. Furthermore, it is mentioned a possible effect of a crystal disorder on the luminescence profile of EuIII in EuL.

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