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Title: The Role of Bi 3+ in Promoting and Stabilizing Iron Oxo Clusters in Strong Acid

Journal Article · · Angewandte Chemie

Abstract Metal oxo clusters and metal oxides assemble and precipitate from water in processes that depend on pH, temperature, and concentration. Other parameters that influence the structure, composition, and nuclearity of “molecular” and bulk metal oxides are poorly understood, and have thus not been exploited. Herein, we show that Bi 3+ drives the formation of aqueous Fe 3+ clusters, usurping the role of pH. We isolated and structurally characterized a Bi/Fe cluster, Fe 3 BiO 2 (CCl 3 COO) 8 (THF)(H 2 O) 2 , and demonstrated its conversion into an iron Keggin ion capped by six Bi 3+ irons ( Bi 6 Fe 13 ). The reaction pathway was documented by X‐ray scattering and mass spectrometry. Opposing the expected trend, increased cluster nuclearity required a pH decrease instead of a pH increase. We attribute this anomalous behavior of Bi/Fe(aq) solutions to Bi 3+ , which drives hydrolysis and condensation. Likewise, Bi 3+ stabilizes metal oxo clusters and metal oxides in strongly acidic conditions, which is important in applications such as water oxidation for energy storage.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0010802
OSTI ID:
1434542
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 21 Vol. 130; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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