Tetra-Ln³⁺-Implanted Tellurotungstates Covalently Modified by dl-Malic Acid: Proton Conduction and Photochromic Properties

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(19), P. 8791 - 8798

Published: April 30, 2024

Three unique dl-malic acid covalently modified tetra-Ln3+-implanted tellurotungstates [H2(CH3)2]9NaH9[Ln4(H2O)14W6O13(OH)5(Mal)2(B-α-TeW9O33)4]·48H2O [Ln = La3+ (1), Ce3+ (2), Pr3+ (3); H3Mal acid] were fabricated by reacting Na2TeO3, Na2WO4·2H2O, Mal, and LnCl3·6H2O with dimethylamine hydrochloride in an aqueous solution. The most prominent architectural feature of these compounds is the covalent connection mode organic ligand a polyoxometallate backbone, which relatively rare realm polyoxotungstates. tetrameric polyanion can be deemed as four [TeW9O33]8– fragments fused together via intriguing hexanuclearity [W6O13(OH)5(Mal)2Ln4(H2O)14]13+ cluster. Impedance measurements manifest that all three complexes display splendid proton conduction properties, exceptional conductivity for 2 up to 2.48 × 10–2 S·cm–1 under 85 °C 95% relative humidity. Moreover, 1 3 exhibited fast reversible photochromic properties allochroic half-life periods t1/2 1.046 0.544 min, respectively.

Language: Английский

---

Recent advances in polyoxometalate-based lanthanide–oxo clusters

Polyoxometalates, Journal Year: 2022, Volume and Issue: 2(2), P. 9140022 - 9140022

Published: Dec. 22, 2022

Polyoxometalate (POM)-based lanthanide-oxo clusters (LnOCs) are a class of polynuclear lanthanide–oxygen complexes formed by polyoxometalate stabilization through oxygen bridges in which POMs can be viewed as multidentate inorganic ligands. POM-based LnOCs have received interest owing to their interesting structures and potential applications. In this paper, we summarize the classification, synthesis strategies, properties LnOCs. classified into three main categories according metal core element type quantity: pure 4f clusters, 5d–4f 3d–4f clusters. Their synthetic strategies divided four based on source POM involved structural assembly: lacunary ligand-directed method, in-situ transformation generation mixed strategies. addition, single-molecule magnets proton conduction summarized.

Language: Английский

---

Luminescent Dimeric Oxalate-Bridged Eu³⁺/Tb³⁺-Implanted Arsenotungstates: Tunable Emission, Energy Transfer, and Detection of Ba²⁺ Ion in Aqueous Solution

Inorganic Chemistry, Journal Year: 2022, Volume and Issue: 61(8), P. 3387 - 3395

Published: Feb. 15, 2022

Two cases of lanthanide (Ln)-implanted arsenotungstates, K17Na2H5[{(As2W19O67(H2O))Ln(H2O)2}2(C2O4)]·87H2O (Ln = Eu (1), Ln Tb (2)) and their codoped derivatives EuxTb1-x-POM (x 0.01 (3), x 0.04 (4), 0.1 (5), 0.2 (6)) were prepared further characterized by powder X-ray diffraction, infrared spectra, thermogravimetric analyses. An structural analysis 1 2 indicates that they both present a dimeric oxalate-bridged Ln3+-implanted arsenotungstate polyanion structure. Under the O → W LMCT excitation at 265 nm polyanions, emissions Ln3+ ions in are sensitized lifetimes prolonged. Codoped compounds 3-6 demonstrate color-tunable emission from green to red adjusting Eu3+/Tb3+ ratio. Emission spectra time-resolved spectroscopic studies performed for 3 authenticate energy transfer processes excited arsenotungstates Eu3+ Tb3+ metal also between centers. More interestingly, is an effective fluorescent probe recognition detection Ba2+ aqueous solution. The optical properties Ln-implanted not only expressly reveal distinctive those but broaden application POM-based materials fluorescence sensing field.

Language: Английский

---

Rigid-Flexible-Ligand-Ornamented Lanthanide-Incorporated Selenotungstates and Photoluminescence Properties

Chinese Journal of Structural Chemistry, Journal Year: 2024, Volume and Issue: unknown, P. 100370 - 100370

Published: June 1, 2024

Language: Английский

---

Multinuclear Lanthanide-Implanted Tetrameric Dawson-Type Phosphotungstates with Switchable Luminescence Behaviors Induced by Fast Photochromism

Inorganic Chemistry, Journal Year: 2021, Volume and Issue: 60(11), P. 8164 - 8172

Published: May 20, 2021

A series of benzoate-decorated lanthanide (Ln)-containing tetrameric Dawson-type phosphotungstates [N(CH3)4]6H20[{(P2W17O61)Ln(H2O)3Ln(C6H5COO)(H2O)6]}{[(P2W17O61)Ln(H2O)3}]2Cl2·98H2O [Ln = Sm (1), Eu (2), and Gd (3)] were made using a facile one-step assembly strategy characterized by several techniques. Notably, the Ln-containing polyoxoanions [{(P2W17O61)Ln(H2O)3Ln(C6H5COO)(H2O)6]}{[(P2W17O61)Ln(H2O)3}]224– are all established four monolacunary [P2W17O61]10– segments, encapsulating Ln3+ ion with two benzoates coordinating to ions. 1–3 exhibit reversible photochromism, which can change from intrinsic white blue for 6 min upon UV irradiation, their colors gradually recover 30 h in dark. The solid-state photoluminescence spectra 1 2 display characteristic emissions Ln components based on 4f–4f transitions. Time-resolved emission also measured authenticate energy transfer phosphotungstate organic chromophores Eu3+. In particular, shows an effectively switchable luminescence behavior induced its fast photochromism.

Language: Английский

---

Discovery and Isolation of Two Arsenotungastate Species: [As₄W₄₈O₁₆₈]^36– and [As₂W₂₁O₇₇(H₂O)₃]^22–

Inorganic Chemistry, Journal Year: 2023, Volume and Issue: 62(8), P. 3338 - 3342

Published: Feb. 15, 2023

Two novel arsenotungstate species, [As4W48O168]36– (1a) and [As2W21O77(H2O)3]22– (2a), have been successfully isolated under a one-pot synthetic method. 1a is the second largest cluster constructed from four {AsW12} clusters combined together. 2a can be described as lacunary sites of {As2W19} filled by {W2O8} units. Compounds 1 2 exhibit proton conductivity properties, value 5.0 × 10–3 S cm–1 at 98% relative humidity 75 °C. This work proves that lattice water molecules polyoxoanions participate in formation hydrogen bond, acting effective pathway for intermolecular conduction.

Language: Английский

---

2,3-pyrazine dicarboxylate-bridged Ln-based arsenotungstates with luminescent properties

Journal of Molecular Structure, Journal Year: 2024, Volume and Issue: 1310, P. 138366 - 138366

Published: April 15, 2024

Language: Английский

---

Controllable Synthesis and Ultrahigh Proton Conduction of a Hydrogen-Bond Network

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(43), P. 20492 - 20500

Published: Oct. 16, 2024

The functionalization of polyoxometalates with organic ligands provides a new-style strategy to accurately incorporate advanced functional moieties on their surfaces, the development which has attracted increasing research interest due potential applications. A germanium tungstate Na

Language: Английский

---

Ln3+-Bridged 2D Dawson-Type Phosphotungstates with Efficient Hydrolytic Cleavage Activity of a DNA-Model Phosphodiester

Journal of Molecular Structure, Journal Year: 2025, Volume and Issue: unknown, P. 141845 - 141845

Published: Feb. 1, 2025

Language: Английский

---

Assembly of tetra-nuclear Yb^III-containing selenotungstate clusters: synthesis, structures, and magnetic properties

Dalton Transactions, Journal Year: 2021, Volume and Issue: 50(33), P. 11535 - 11541

Published: Jan. 1, 2021

The first Yb III -containing POMs with a selenium heteroatom have been isolated, namely Keggin {Yb 4 Se 6 W 44 } and Wells–Dawson 45 }, the former of which exhibits field-induced SMM behavior.

Language: Английский

---