SrAl5Pt3 and Sr2Al16Pt9 – two new strontium aluminum platinides
Author:
Engel Stefan1, Bönnighausen Judith2, Stegemann Frank2, Touzani Rachid S.3, Janka Oliver1
Affiliation:
1. Anorganische Festkörperchemie , Universität des Saarlandes , Campus C4.1 , Saarbrücken , 66123 , Germany 2. Institut für Anorganische und Analytische Chemie , Universität Münster , Corrensstrasse 30 , Münster , 48149 , Germany 3. Institut für Werkstoff- und Fügetechnik (IWF) , Otto-von-Guericke-Universität Magdeburg , Universitätsplatz 2 , Magdeburg , 39106 , Germany
Abstract
Abstract
During attempts to synthesize new platinides in the ternary system Sr–Al–Pt, single crystals of SrAl5Pt3 and Sr2Al16Pt9 were obtained from a reaction of the elements with the nominal composition Sr4Al13Pt9. Both orthorhombic structures were refined based on single crystal x-ray diffraction data (SrAl5Pt3: Pnma, Wyckoff sequence c
9, a = 2065.04(7), b = 413.74(1), c = 738.98(3) pm, wR2 = 0.0310, 867 F
2 values, 56 variables; Sr2Al16Pt9: Immm, Wyckoff sequence l
4
j
2
ihga, a = 416.69(2), b = 1193.53(6), c = 1832.38(9) pm, wR2 = 0.0517, 671 F
2 values, 49 variables); full atomic ordering was observed in both cases. In order to analyze the bonding situation of these new platinides, quantum-chemical calculations were conducted. According to density functional theory both compounds are polar intermetallics with high negative charges on the Pt atoms and covalently bonded [Al5Pt3]/[Al16Pt9] networks showing strong Pt–Al alongside of weak Al–Al and Pt–Pt bonding.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
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