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Title: Control of cerium oxidation state through metal complex secondary structures

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/C5SC02607E· OSTI ID:1221895

A series of alkali metal cerium diphenylhydrazido complexes, Mx(py)y[Ce(PhNNPh)4], M = Li, Na, and K, x = 4 (Li and Na) or 5 (K), and y = 4 (Li), 8 (Na), or 7 (K), were synthesized to probe how a secondary coordination sphere would modulate electronic structures at a cerium cation. The resulting electronic structures of the heterobimetallic cerium diphenylhydrazido complexes were found to be strongly dependent on the identity of the alkali metal cations. When M = Li+ or Na+, the cerium(III) starting material was oxidized with concomitant reduction of 1,2-diphenylhydrazine to aniline. Reduction of 1,2-diphenylhydrazine was not observed when M = K+, and the complex remained in the cerium(III) oxidation state. Oxidation of the cerium(III) diphenylhydrazido complex to the Ce(IV) diphenylhydrazido one was achieved through a simple cation exchange reaction of the alkali metals. As a result, UV-Vis spectroscopy, FTIR spectroscopy, electrochemistry, magnetic susceptibility, and DFT studies were used to probe the oxidation state and the electronic changes that occurred at the metal centre.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Contributing Organization:
National Science Foundation (NSF), Washington, DC (United States)
Grant/Contract Number:
SC0006518
OSTI ID:
1221895
Journal Information:
Chemical Science, Journal Name: Chemical Science; ISSN 2041-6520
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 26 works
Citation information provided by
Web of Science

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Cited By (11)

Bright Photoluminescence of [{(CptBu2 ) 2 Ce( μ -Cl)} 2 ]: A Valuable Technique for the Determination of the Oxidation State of Cerium journal March 2018
Structure, Electronics and Reactivity of Ce(PNP) Complexes journal October 2017
The inverse-trans-influence in tetravalent lanthanide and actinide bis(carbene) complexes journal February 2017
Ion association with tetra-n-alkylammonium cations stabilizes higher-oxidation-state neptunium dioxocations journal January 2019
Dicerium letterbox-shaped tetraphenolates: f-block complexes designed for two-electron chemistry journal January 2020
Stability Constants and Rate Constants of Intramolecular Redox Decomposition of Cerium(IV) Complexes with Certain Hydroxycarboxylic Acids in Nitrate Medium journal October 2019
Reduction of a Cerium(III) Siloxide Complex To Afford a Quadruple-Decker Arene-Bridged Cerium(II) Sandwich journal November 2017
Rare‐Earth Metal Diimide Complexes via Alkylaluminate Templating, Including a Ceric Derivative journal December 2018
Thermodynamic and kinetic stability of cerium(IV) complexes with a series of aminopolyacetic acids journal November 2016
Redox-enhanced hemilability of a tris( tert -butoxy)siloxy ligand at cerium journal January 2018
Reduction of a Cerium(III) Siloxide Complex To Afford a Quadruple-Decker Arene-Bridged Cerium(II) Sandwich journal November 2017


Figures / Tables (9)


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