Mixed-Ligand Europium Complexes with Toluic Acid

Europium complexes with toluic acid having the composition Eu(Tol)₃· nD · xH₂O, where Tol^–is the meta-toluate anion, D is 1,10-phenanthroline (n= 2, x= 1), 2,2"-dipyridyl, piperidine, diphenylguanidine, triphenylphosphine oxide (n= 1, x= 2), and H₂O (n= 0, x= 2), were synthesized. The spectroscopic and luminescence properties of these complexes were studied. The title compounds are thermally stable up to 270°C. According to IR spectroscopy, two modes of coordination of the toluate anion, i.e., monodentate and bidentate coordination, can be found in europium toluates.