Synthesis, structure, and luminescent properties of a family of lanthanide-functionalized peroxoniobiophosphates

Abstract

Eight new lanthanide derivatives containing 6-peroxoniobio-4-phosphate building block, [LnIII(H2O)6]2[H4(NbO2)6P4O24]·nH2O [Ln = Eu (1), Gd (2), Tb (3), Dy (4), Ho (5), Er (6), Tm (7), Yb (8), 1–5, 7, 8 n = 12; 6 n = 9], have been successfully obtained using an in-situ strategy and fully characterized in the solid state by single-crystal X-ray diffraction, IR spectra, TG-MS, PXRD. Structural analyses indicate that these isostructural polyanions 1–8 consist of one [P4(NbO2)6O24]10− (P 4 (NbO 2 ) 6) clusters and two pendant Ln3+ cations. In these compounds, P 4(NbO 2 ) 6 clusters are connected by lanthanide cations to form extended two-dimensional architectures. The approach takes advantage of the ability of in-situ formed P 4(NbO 2 ) 6 cluster to build frameworks by using it as ligands to lanthanide ions. The photoluminescence (PL) and lifetime decay behaviors of 1, 3 and 4 in solid state have been performed at room temperature. The PL emission of 1, 3 and 4 is mainly derived from the characteristic 5D0→7FJ (J = 1, 2, 3, 4), 5D4→7FJ (J = 6, 5, 4, 3) and 4F9/2→6H J (J = 15/2, 13/2, 11/2) transitions of the EuIII, TbIII and DyIII cations, respectively.

Luminescent Studies on Germanate Glasses Doped with Europium Ions for Photonic Applications

“…Currently, active hybrid structures are proposed, in which crystalline phases are introduced within the amorphous matrix using various methods, including thermal treatment [1], direct doping [2], chemical vapor deposition (CVD) [3], and 3D printing [4]. All of these methods require glasses with modified structural properties, ensuring the conditions for obtaining new luminescent properties (from embedded active structures) while maintaining the stability of the hybrid system [5][6][7].…”

Assembly of Lanthanide-Containing Polyoxotantalate Clusters with Efficient Photoluminescence Properties

“…Interestingly, {Ta 6 O 19 } ion can dissolve in aqueous H 2 O 2 . We speculate that Lindqvist-type [Ta 6 O 19 ] 8– in an aqueous solution of H 2 O 2 would exist as a stable complex, a peroxo ion, and the complex might decompose on the complete addition of H 3 PO 4 solution, resulting in P 4 Nb 6 or P 4 Ta 6 aggregation. ,, In this paper, we focus our studies on hydrogen peroxide realizing the coexistence of [Ta 6 O 19 ] 8– and Ln 3+ ions in the same system. Meanwhile, the addition of a heteroanion realizes an increase in the structural diversity and functionality of the polyoxoanions.…”

Recent studies on the reaction of [X6O19]8− (X = Nb, Ta) polyanions under acidic conditions

“…11c–f). 87,88 The Ln derivatives [Ln III (H 2 O) 6 ] 2 [H 4 (NbO 2 ) 6 P 4 O 24 ] (Ln = Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) exhibit 2D structures (Fig. 11f).…”