Bifunctional ligands in uranyl chemistry: Metalloligands and zwitterions

Coordination Chemistry Reviews, Journal Year: 2024, Volume and Issue: 510, P. 215821 - 215821

Published: April 9, 2024

Structural studies of uranyl ion complexes metalloligands and zwitterions, ligand classes with some degree overlap, constitute a major contribution to more recent developments in uranium chemistry. To extent, they have been focussed on basic product characterization but generally gaining an understanding how particular features structure may influence the complete crystal thus potential for any applications. Metalloligands provide obvious means generating heterometallic since it is not always necessary preform metalloligand prior its interaction ion, can be identified by somewhat arbitrary excision appropriate components from very large number structures, so that only selected examples are considered here. Zwitterion (and oligozwitterion) complex structures treated comprehensively, two subclasses here being those where positive site aprotic protic, differing weak interactions involved. Association zwitterionic ligands classical, anionic polycarboxylates cucurbiturils covered extensively.

Language: Английский

---

Dual Free Radical Synergism for Enhancing Proton Conductivity in Photochromism iHOFs

Precision Chemistry, Journal Year: 2025, Volume and Issue: 3(4), P. 221 - 230

Published: Feb. 20, 2025

Stimuli-responsive smart materials, as an emerging material, can fulfill reversible transformation of chemical/physical properties under external stimuli such mechanical stress, light, and electricity, which has the highlights rapid response, designable structure, function. Two ionic hydrogen-bonded organic frameworks (iHOFs 36-37) were synthesized by self-assembly bis(benzene-o/p-sulfonic acid)-naphthalenediimide (o/p-H2BSNDI) two basic ligands. The naphthalenediimide (NDI) was introduced into material to equip iHOFs 36-37 with radical-driven photochromic behavior. proton conductivity iHOF-37 demonstrated a maximum 6.50 × 10-4 S·cm-1 at 98% RH 100 °C, it increased 9.10 10-3 due dual free radical synergism following UV irradiation (NDI viologen), represents significant 14-fold enhancement. Furthermore, incorporation chitosan (CS) matrix forms composite membranes. 5%-iHOF-37/CS membrane reached up 5.70 10-2 90 8.08 after irradiation. This work reveals radicals generated NDI viologen derivatives, whose synergistic action plays role in enhancing membranes, rendering rational design stimuli-responsive materials feasible.

Language: Английский

---

Photochromic Ln-Phosphonates Assembled by an Imidazole Derivative: Construction, Crystal Structures, and Light-Enhanced Proton Conductivity

Crystal Growth & Design, Journal Year: 2024, Volume and Issue: 24(5), P. 2202 - 2209

Published: Feb. 23, 2024

A series of Ln(III)-based coordination compounds with one-dimensional chains have been synthesized by assembling organic phosphonate ligands hydroxyethylidene diphosphonate (HEDP) and the imidazole derivative 2,4,5-tris(4-pyridyl)-imidazole (TPI) lanthanide ions under solvothermal conditions. Based on electron-donor/-acceptor property, isomorphic exhibit radical-actuated photochromic behavior induced electron transfer process light illumination at room temperature. In addition, taking advantage abundant hydrogen-bond interactions in structures, display significant proton conduction temperature range 303–343 K 100% relative humidity. Importantly, conductivities all increase about compared to initial state after irradiation. As a result, this work shows new hybrid complexes photomodulated characteristics, providing method for design intelligent multifunctional materials diverse photochromism tunable conduction.

Language: Английский

---

Systematic Study of Solid-State U(VI) Photoreactivity: Long-Lived Radicalization and Electron Transfer in Uranyl Tetrachloride

Inorganic Chemistry, Journal Year: 2024, Volume and Issue: 63(11), P. 4957 - 4971

Published: March 4, 2024

Reported are the syntheses, structural characterizations, and luminescence properties of three novel [UO2Cl4]2– bearing compounds containing substituted 1,1′-dialkyl-4,4′-bipyridinum dications (i.e., viologens). These undergo photoinduced quenching upon exposure to UV radiation. This reactivity is concurrent with two phenomena: radicalization uranyl tetrachloride anion photoelectron transfer viologen which constitutes formal one electron from species. behavior elucidated using paramagnetic resonance (EPR) spectroscopy further probed through a series characterization computational techniques including Rehm–Weller analysis, time-dependent density functional theory (TD-DFT), states (DOS). work provides systematic study photoreactivity unit in solid state, an under-described aspect fundamental chemistry.

Language: Английский

---

A review on uranyl-based photocatalysts in photocatalytic organic transformation

Journal of Catalysis, Journal Year: 2024, Volume and Issue: unknown, P. 115900 - 115900

Published: Dec. 1, 2024

Language: Английский

---