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Title: Polar Intermetallics Pr 5Co 2Ge 3 and Pr 7Co 2Ge 4 With Planar Hydrocarbon-Like Metal Clusters

Abstract

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, Pr 5Co 2Ge 3 and Pr 7Co 2Ge 4, both of which feature such planar metal clusters, viz., ethylene-like [Co 2Ge 4] clusters plus the concatenated forms and polyacene-like [Co 2Ge 2] n ribbons in Pr 5Co 2Ge 3, and 1,2,4,5-tetramethylbenzene-like [Co4Ge6] cluster in Pr 7Co 2Ge 4. 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: Pr 5Co 2Ge 3 via a series of transitions below 150 K; and Pr 7Co 2Ge 4 via a single ferromagnetic transition at 19 K. Spin-polarized electronic structure calculations for Pr 7Co 2Ge 4 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.

Authors:
 [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1];  [4];  [4]
  1. Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Ames Lab., Ames, IA (United States); Univ. of California, Davis, CA (United States)
  4. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1368045
Report Number(s):
IS-J-9333
Journal ID: ISSN 0947-6539
Grant/Contract Number:
AC02-07CH11358
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemistry - A European Journal
Additional Journal Information:
Journal Volume: 23; Journal Issue: 44; Journal ID: ISSN 0947-6539
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; polar intermetallic; single crystal; X-ray diffraction; metallorganic cluster; spin-orbit coupling

Citation Formats

Lin, Qisheng, Aguirre, Kaiser, Saunders, Scott M., Hackett, Timothy A., Liu, Yong, Taufour, Valentin, Paudyal, Durga, Budko, Sergey, Canfield, Paul C., and Miller, Gordon J. Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters. United States: N. p., 2017. Web. doi:10.1002/chem.201702798.
Lin, Qisheng, Aguirre, Kaiser, Saunders, Scott M., Hackett, Timothy A., Liu, Yong, Taufour, Valentin, Paudyal, Durga, Budko, Sergey, Canfield, Paul C., & Miller, Gordon J. Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters. United States. doi:10.1002/chem.201702798.
Lin, Qisheng, Aguirre, Kaiser, Saunders, Scott M., Hackett, Timothy A., Liu, Yong, Taufour, Valentin, Paudyal, Durga, Budko, Sergey, Canfield, Paul C., and Miller, Gordon J. Mon . "Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters". United States. doi:10.1002/chem.201702798.
@article{osti_1368045,
title = {Polar Intermetallics Pr5Co2Ge3 and Pr7Co2Ge4 With Planar Hydrocarbon-Like Metal Clusters},
author = {Lin, Qisheng and Aguirre, Kaiser and Saunders, Scott M. and Hackett, Timothy A. and Liu, Yong and Taufour, Valentin and Paudyal, Durga and Budko, Sergey and Canfield, Paul C. and Miller, Gordon J.},
abstractNote = {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.},
doi = {10.1002/chem.201702798},
journal = {Chemistry - A European Journal},
number = 44,
volume = 23,
place = {United States},
year = {Mon Jun 19 00:00:00 EDT 2017},
month = {Mon Jun 19 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on June 19, 2018
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