A series of three isostructural 1D lanthanide coordination network based on 4,4 ',4 ''-((benzene-1,3,5-triyltris(methylene))tris(oxy))tribenzoate ligand: Synthesis, crystal structure and photophysical properties

Author(s)

Petiote, Lanousse ; Cabral, Filipe M. ; Formiga, Andre L. B. ; Mazali, Italo O. ; Sigoli, Fernando A.

• Document type: Journal article
• Source: Inorganica Chimica Acta; v. 494, p. 9-pg., 2019-08-01.

Abstract

Three 1D-coordination networks namely {[Ln(L)(DMF)(H2O)]center dot 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 = Eu-III, Gd-III or Tb-III). 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 P (1) over bar. 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)]center dot DMF}(n) lies energetically above the main emitting states of both Eu-III and Tb-III. 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 Eu-III and Tb-III 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 Eu-III in EuL. (AU)

• FAPESP's process: 14/50906-9 - INCT 2014: in Functional Complex Materials
• Grantee: Fernando Galembeck
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants