[Sans titre]
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | MISHRA, Trinath | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | EUL, Matthias | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MATAR, Samir F. | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | PÖTTGEN, Rainer | |
| dc.date.issued | 2010 | |
| dc.identifier.issn | 0044-2313 | |
| dc.description.abstractEn | The rare earth borides <i>RE</i>Ru<sub>4</sub>B<sub>4</sub> (<i>RE</i> = Ce, Pr, Nd, Sm) were synthesized from the elements by arc-melting and their crystal structures were studied on the basis of X-ray powder and single-crystal diffraction: LuRu<sub>4</sub>B<sub>4</sub> type, <i>I</i>4<sub>1</sub>/<i>acd</i>, <i>a</i> = 747.47(8), <i>c</i> = 1506.4(3) pm, <i>wR</i><sub>2</sub> = 0.0579, 362 <i>F</i><sup>2</sup> values for CeRu<sub>4</sub>B<sub>4</sub>, <i>a</i> = 751.3(2), <i>c</i> = 1507.1(5) pm, <i>wR</i><sub>2</sub> = 0.0724, 471 <i>F</i><sup>2</sup> values for PrRu<sub>4</sub>B<sub>4</sub>, <i>a</i> = 751.0(2), <i>c</i> = 1506.9(6) pm, <i>wR</i><sub>2</sub> = 0.0598, 384 <i>F</i><sup>2</sup> values for NdRu<sub>4</sub>B<sub>4</sub>, and <i>a</i> = 749.1(1), <i>c</i> = 1506.0(3) pm, <i>wR</i><sub>2</sub> = 0.0759, 413 <i>F</i><sup>2</sup> values for SmRu<sub>4</sub>B<sub>4</sub>, with 18 variables per refinement. Striking structural motifs of the <i>RE</i>Ru<sub>4</sub>B<sub>4</sub> structures are Ru<sub>4</sub> tetrahedra and B<sub>2</sub> dumbbells with Ru-Ru and B-B distances of 271 and 180 pm in CeRu<sub>4</sub>B<sub>4</sub>. The intermediate valence of cerium leads to shorter Ce-Ru distances of 292 pm. CeRu<sub>4</sub>B<sub>4</sub> behaves like a Pauli paramagnet with a small room temperature susceptibility of 1.5 × 10<sup>-4</sup> emu<b>·</b>mol<sup>-1</sup>. Chemical bonding analyses shows substantial Ru-B and B-B bonding within the [Ru<sub>4</sub>B<sub>4</sub>] substructure. | |
| dc.language.iso | en | |
| dc.publisher | Wiley-VCH Verlag | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1002/zaac.200900562 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie | |
| bordeaux.page | 1236-1241 | |
| bordeaux.volume | 636 | |
| bordeaux.issue | 7 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00494477 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00494477v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Inorganic%20and%20General%20Chemistry%20/%20Zeitschrift%20f%C3%BCr%20anorganische%20und%20allgemeine%20Chemie&rft.date=2010&rft.volume=636&rft.issue=7&rft.spage=1236-1241&rft.epage=1236-1241&rft.eissn=0044-2313&rft.issn=0044-2313&rft.au=MISHRA,%20Trinath&EUL,%20Matthias&MATAR,%20Samir%20F.&P%C3%96TTGEN,%20Rainer&rft.genre=article |
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