Three Types of Lanthanide-Containing Polyoxoniobates and Their Luminescence Properties

Abstract

Fourteen lanthanide (Ln)-containing hetero selenato-phosphato-peroxopolyoxoniobates in three series: (1) Cs 2 {[Ln(H 2 O) 4 ][H 4 P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} 2 •nH 2 O [Ln = Ce (I-Ce), Pr (I-Pr), Sm (I-Sm), Eu (I-Eu), Gd (I-Gd); I-Ce, I-Pr, I-Eu, I-Gd n = 12; I-Sm n = 16]; (2) Cs 2 K 3 {[Ln(H 2 O) 6 ][H 2.5 P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} 2 •nH 2 O [Ln = Dy (II-Dy), Tm (II-

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

“…As an illustration, Niu and colleagues explored the single-molecule magnet properties of [H 123 Nb 36 P 12 W 72 Mn III 12 Mn II 3 NaO 424 ] 10− , revealing that each {Mn III 3 } subunit functions as an independent single-molecule magnet (SMM). 68 In addition, the photoluminescence properties unveil an energy transfer phenomenon from the {(TaO 2 ) 6 As 4 O 24 } 93 and {P 2 Se 2 Nb 6 } 90 segments to the Ln III center, effectively enhancing emissions from the Ln 3+ center. And, as Casey et al reported, the [H 7 Nb 6 P 4 O 24 (O 2 ) 6 ] 3− cluster enables the deposition of high-quality patterned thin films from simple aqueous solutions – a first step in evaluating their potential as functional materials for the semiconductor industry.…”

“…Mass spectrometry results confirmed that the structure of [P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ] 8− remained intact in aqueous solution. In 2022, they reported the in situ synthesis of the Ln derivatives of [P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ] 8− polyanions, 90 formed as {[Ln(H 2 O) 6 ][H 2.5 P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} 2 5− [Ln = Dy, Tm, Yb, Lu]; {[Ln(H 2 O) 4 ][H 4 P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} 2 2− [Ln = Ce, Pr, Sm, Eu, Gd]; and {[Ln(H 2 O) 6 ][P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} 2 {[Ln x (H 2 O) y ] 2 [P 2 Se 2 Nb 6 (O 2 ) 6 O 22 ]} (7+m)− [Ln = Ho, Er, Tm, Yb, Lu], and represented them as one-dimensional (Fig. 11h) and two-dimensional (Fig.…”