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Title: Reversible M−M Bonding by Alkaline Earth Metals (Mg, Ca, Sr, Ba) in Graphite Intercalation Compounds

Journal Article · · Chemistry - A European Journal

Abstract The alkaline earth metals (M=Mg, Ca, Sr, and Ba) exhibit a +2 oxidation state in nearly all known stable compounds, but M I dimeric complexes with M−M bonding, [M 2 (en) 2 ] 2+ , (en=ethylenediamine) of all these metals can be stabilized within the galleries of donor‐type graphite intercalation compounds (GICs). These metals can also form GICs with more conventional metal (II) ion complexes, [M(en) 2 ] 2+ . Here, the facile interconversion between dimeric‐M I and monomeric‐M II intercalates upon the addition/removal of en are reported. Thermogravimetry, powder X‐ray diffraction, and pair distribution function analysis of total scattering data support the presence of either [M 2 (en) 2 ] 2+ or [M(en) 2 ] 2+ guests. This phase conversion requires coupling graphene and metal redox centers, with associated reversible M−M bond formation within graphene galleries. This chemistry allows the facile isolation of unusual oxidation states, reveals M 0 →M 2+ reaction pathways, and present new opportunities in the design of hybrid conversion/intercalation materials for applications such as charge storage.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE SC0010802
OSTI ID:
1631493
Journal Information:
Chemistry - A European Journal, Journal Name: Chemistry - A European Journal Vol. 26 Journal Issue: 36; ISSN 0947-6539
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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