Title
Spatial separation of covalent, ionic, and metallic interactions in <tex>$Mg_{11}Rh_{18}B_{8}$</tex> and <tex>$Mg_{3}Rh_{5}B_{3}$</tex> Spatial separation of covalent, ionic, and metallic interactions in <tex>$Mg_{11}Rh_{18}B_{8}$</tex> and <tex>$Mg_{3}Rh_{5}B_{3}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Weinheim ,
Subject
Chemistry
Source (journal)
Chemistry: a European journal. - Weinheim
Volume/pages
19(2013) :52 , p. 17860-17870
ISSN
0947-6539
ISI
000328531000028
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The crystal structures of Mg11Rh18B8 and Mg3Rh5B3 have been investigated by using single-crystal X-ray diffraction. Mg11Rh18B8: space group P4/mbm; a=17.9949(7), c=2.9271(1)angstrom; Z=2. Mg3Rh5B3: space group Pmma; a=8.450(2), b=2.8644(6), c=11.602(2)angstrom; Z=2. Both crystal structures are characterized by trigonal prismatic coordination of the boron atoms by rhodium atoms. The [BRh6] trigonal prisms form arrangements with different connectivity patterns. Analysis of the chemical bonding by means of the electron-localizability/electron-density approach reveals covalent BRh interactions in these arrangements and the formation of BRh polyanions. The magnesium atoms that are located inside the polyanions interact ionically with their environment, whereas, in the structure parts, which are mainly formed by Mg and Rh atoms, multicenter (metallic) interactions are observed. Diamagnetic behavior and metallic electron transport of the Mg11Rh18B8 and Mg3Rh5B3 phases are in agreement with the bonding picture and the band structure.
E-info
https://repository.uantwerpen.be/docman/iruaauth/f52d49/65f6633.pdf
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