Phosphineoxide-Chelated Europium(III) Nanoparticles for Ceftriaxone Detection

Abstract

The present work demonstrates the optimization of the ligand structure in the series of bis(phosphine oxide) and β-ketophosphine oxide representatives for efficient coordination of Tb3+ and Eu3+ ions with the formation of the complexes exhibiting high Tb3+- and Eu3+-centered luminescence. The analysis of the stoichiometry and structure of the lanthanide complexes obtained using the XRD method reveals the great impact of the bridging group nature between two phosphine oxide moieties on the coordination mode of the ligands with Tb3+ and Eu3+ ions. The bridging imido-group facilitates the deprotonation of the imido- bis(phosphine oxide) ligand followed by the formation of tris-complexes. The spectral and PXRD analysis of the separated colloids indicates that the high stability of the tris-complexes provides their safe conversion into polystyrenesulfonate-stabilized colloids using the solvent exchange method. The red Eu3+-centered luminescence of the tris-complex exhibits the same specificity in the solutions and the colloids. The pronounced luminescent response on the antibiotic ceftriaxone allows for sensing the latter in aqueous solutions with an LOD value equal to 0.974 μM.

Three derivatives of phenacyldiphenylphosphine oxide: influence of aromatic and alkyl substituents on the luminescence sensitization of four Ln(NO3)3 salts

“…2 The ability of the phosphine oxide group to facilitate this sensitization process has also been investigated, but to a lesser extent. [15][16][17][18][19][20][21][22] Our goal with this work was to tease out the role of each functional group of the ligandthe carbonyl vs. the phosphine oxidein both the Ln(III) binding and luminescence properties of its resultant complexes. To investigate this, we prepared the three derivatives 2-4 shown in Fig.…”

4-(diphenylphosphoryl)-1-phenylbutane-1,3-dione

“…Phosphine oxides with an additional functional group are effective ligands for preparing complexes with lanthanides [1] with promising photophysical properties for fabricating OLEDs [2][3][4] or detecting various compounds [5]. Another class of well-studied ligands for complex synthesis with lanthanides are β-diketones [6].…”