Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters

Lin, Qisheng; Aguirre, Kaiser; Saunders, Scott M.; Hackett, Timothy A.; Liu, Yong; Taufour, Valentin; Paudyal, Durga; Budko, Sergey; Canfield, Paul C.; Miller, Gordon J.

doi:10.1002/chem.201702798

Title: Polar Intermetallics Pr₅Co₂Ge₃ and Pr₇Co₂Ge₄ With Planar Hydrocarbon-Like Metal Clusters

Journal Article · Mon Jun 19 00:00:00 EDT 2017 · Chemistry - A European Journal

DOI:https://doi.org/10.1002/chem.201702798· OSTI ID:1368045

Lin, Qisheng ^[1]; Aguirre, Kaiser ^[1]; Saunders, Scott M. ^[2]; Hackett, Timothy A. ^[1]; Liu, Yong ^[1]; Taufour, Valentin ^[3]; Paudyal, Durga ^[1]; Budko, Sergey ^[1]; Canfield, Paul C. ^[4]; Miller, Gordon J. ^[4]

Ames Lab., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)
Ames Lab., Ames, IA (United States); Univ. of California, Davis, CA (United States)
Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Planar hydrocarbon-like metal clusters may foster new insights linking organic molecules with conjugated π-π bonding interactions and inorganic structures in terms of their bonding characteristics. However, such clusters are uncommon in polar intermetallics. Herein, we report two polar intermetallic phases, Pr₅Co₂Ge₃ and Pr₇Co₂Ge₄, both of which feature such planar metal clusters, viz., ethylene-like [Co₂Ge₄] clusters plus the concatenated forms and polyacene-like [Co₂Ge₂]_n ribbons in Pr₅Co₂Ge₃, and 1,2,4,5-tetramethylbenzene-like [Co4Ge6] cluster in Pr₇Co₂Ge₄. Just as in the related planar organic structures, these metal-metalloid species are dominated by covalent bonding interactions. Both compounds magnetically order at low temperature with net ferromagnetic components: Pr₅Co₂Ge₃ via a series of transitions below 150 K; and Pr₇Co₂Ge₄ via a single ferromagnetic transition at 19 K. Spin-polarized electronic structure calculations for Pr₇Co₂Ge₄ reveal strong spin-orbit coupling within Pr and considerable magnetic contributions from Co atoms. This work suggests that similar structural chemistry can emerge for other rare earth-late transition metal-main group systems.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1368045

Report Number(s):: IS-J-9333

Journal Information:: Chemistry - A European Journal, Vol. 23, Issue 44; ISSN 0947-6539

Publisher:: ChemPubSoc EuropeCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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References (46)

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Title: Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters

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Title: Polar Intermetallics Pr₅Co₂Ge₃ and Pr₇Co₂Ge₄ With Planar Hydrocarbon-Like Metal Clusters