Determination of fluoroquinolone antibiotics through the fluorescent response of Eu(III) based nanoparticles fabricated by layer-by-layer technique

Interfacial interactions of hard polyelectrolyte-stabilized luminescent colloids with substrates

“…Our previous report [15] revealed the ternary complex formation at the colloid/solution interface as the key reason for the sensing function of the complex-based luminescent colloids. The lanthanide complexes at the colloid/solution interface tend to form ternary complexes with substrates in the similar way with the complexes in solutions, although the ternary complex formation is greatly affected by the nature of the coating of the complex-based colloids [15,27]. Thus, a correlation between an interfacial complex formation and a luminescence of the complex-based colloids is of great importance in a development of nanosized sensors with lanthanide-centered luminescence.…”

“…A plenty of biorelevant substrates are chelating ligands able to complex with lanthanides [8][9][10]. Literature data represent fine examples of luminescent sensing of phosphates [10] and antibiotics [11][12][13][14][15] through a sensitization of lanthanide-centered luminescence in aqueous solutions.…”

“…Thus lanthanide complexes are preferably applied instead of lanthanide ions in sensing. The particular importance of the lanthanide complexes with ␤-diketonates as ancillary ligands for sensing arises from their well-known sensitizing effect on lanthanide-centered luminescence or so-called "antennae effect" arisen from a ligandto-metal energy transfer [15,[18][19][20][21][22][23][24]. These complexes exhibit high binding capacity towards additional ligands, which results from an incomplete coordination sphere of lanthanide ions due to their high coordination numbers [18][19][20][21][22][23][24].…”

Nanomaterials for analysis and monitoring of emerging chemical pollutants

“…fluorophores (e.g., QDs [107][108][109][110], GO [111], and Eu-based NPs [112]); or, quenchers (e.g., AuNPs [111] and graphene [113,114]). …”

“…Davydov et al [112] synthesized fluorescent NPs by using Euorganic complexes as core and multilayered polyelectrolytes as a shell for detection of fluoroquinolone antibiotics. The fluorescence of these Eu-based NPs can be quenched by the analytes via ternary complex formation and ligand exchange.…”