Control of Cerium Oxidation State Through Metal Complex Secondary Structures

Overview

Journal Chem Sci

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2018 Jun 5

PMID 29861931

Citations 7

Authors

Jessica R Levin

Walter L Dorfner

Patrick J Carroll

Eric J Schelter

Affiliations

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Abstract

A series of alkali metal cerium diphenylhydrazido complexes, M (py) [Ce(PhNNPh)], M = Li, Na, and K, = 4 (Li and Na) or 5 (K), and = 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. 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.

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