Formation Mechanism of a Nano-Ring of Bismuth Cations and Mono-Lacunary Keggin-Type Phosphomolybdate.
Inês C B MartinsDominik Al-SabbaghUrsula BentrupJulien MarquardtThomas SchmidErnesto ScoppolaWerner KrausTomasz M StawskiAna Guilherme BuzanichKirill V YusenkoSteffen M WeidnerFranziska EmmerlingPublished in: Chemistry (Weinheim an der Bergstrasse, Germany) (2022)
A new hetero-bimetallic polyoxometalate (POM) nano-ring was synthesized in a one-pot procedure. The structure consists of tetrameric units containing four bismuth-substituted monolacunary Keggin anions including distorted [BiO 8 ] cubes. The nano-ring is formed via self-assembly from metal precursors in aqueous acidic medium. The compound (NH 4 ) 16 [(BiPMo 11 O 39 ) 4 ] ⋅ 22 H 2 O; (P 4 Bi 4 Mo 44 ) was characterized by single-crystal X-ray diffraction, extended X-ray absorption fine structure spectroscopy (EXAFS), Raman spectroscopy, matrix-assisted laser desorption/ionisation-time of flight mass spectrometry (MALDI-TOF), and thermogravimetry/differential scanning calorimetry mass spectrometry (TG-DSC-MS). The formation of the nano-ring in solution was studied by time-resolved in situ small- and wide-angle X-ray scattering (SAXS/WAXS) and in situ EXAFS measurements at the Mo-K and the Bi-L 3 edge indicating a two-step process consisting of condensation of Mo-anions and formation of Bi-Mo-units followed by a rapid self-assembly to yield the final tetrameric ring structure.
Keyphrases
- mass spectrometry
- high resolution
- ionic liquid
- electron microscopy
- raman spectroscopy
- liquid chromatography
- ms ms
- dual energy
- high performance liquid chromatography
- gas chromatography
- multiple sclerosis
- computed tomography
- solid state
- air pollution
- molecular docking
- minimally invasive
- room temperature
- molecular dynamics simulations
- single molecule
- simultaneous determination