Synthesis and characterization of the new carbacylamidophosphate based rare earth tetrakis-complexes NEt4[LnL4]. Effect of the ligand nitro group on luminescence of Eu3+and Tb3+.

O,O'-dimethyl-N-(3-nitrobenzoyl)amidophosphate (HL) was synthesized, structurally characterized, tested as ligand to obtain lanthanide complexes NEt4[LnL4] (Ln = La3 + , Ce3 + , Pr3 + , Nd3 + , Sm3 + , Eu3 + , Gd3 + , Tb3 +, Dy3 +, Er3 +, Y 3 + ) and as a sensitizer of Eu3 + and Tb3 + luminescence. It was shown that besides of typical for carbacylamidophosphates intermolecular contacts, the electrostatic interactions N center dot center dot center dot O of the length 2.936 A exist in the crystal of NEt4[EuL4] and influence on both the crystal packing and the lanthanide polyhedron shape. In the structure of the complex anion, two pairs of symmetry-related ligands differ in configuration (syn-or anti-) of nitro groups with respect to the carbonyl groups. The obtained complexes were found to be thermally stable to near 200 degrees C. Luminescent studies have shown that excitation energy is dissipated, which prevents ligands from efficient luminescence sensitization of europium and terbium.(c) 2022 Elsevier B.V. All rights reserved.