A one-dimensional metal embedded in salt matrices: Synthesis, modulated crystal structures, electrical conductivity, and chemical bonding of 1∞[PdBi6] [(Bl,Sn) 1-δBr5-δ]
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Contributors
Abstract
The metal-rich compounds [PdBi6][(Bi,Sn) 1-δBr5-δ] with δ1 = 2/13, δ1 = 5/26, or δ2= δ'2 = 1In were synthesized from Bi2Pd, BiBr3, and Sn at 300 °C. The crystal structures contain, intermetallic rods 1 ∞[Pd@Bi2/1Bi8/2]2,5+embedded in salt-like matrices, which, consist of groups of bromido-bismuthate(III)- stannate(H) octahedra [(Bi,Sn)nBI4n+2]m- (n = 2, 3) and isolated Br- ions. Metrical incompatibilities of the two subsystems in the crystalline metal-salt hybrid result in non-stoichiometry of the salt part associated with, complex superstructures. The average structure is described in the orthorhombic space group Pmmm with a « 408 pm, b « 2263 pm, c « 849 pm. It feigns statistical distribution of vacancies and orientational disorder of the concatenated octahedra. By choosing the modulation vectors q1 = 2/ta* + 1/2b* + 1/2c* with t 1 = 13 or t2 = 1.2, the additional weak. reflections of the diffraction, patterns are indexed. Ordered structure models are achieved in the [3+l]-dimensional superspace group Pmmm(α1/2 1/2)000 Metallic conductivity along [100], i. e. the direction of the 1∞[Pd@Bi2/1Bi8/2] 2,5+ rods, was determined for a single-crystal. One-dimensional band structure calculations reveal. Bi p-bands crossing the Fermi level for formula charges higher than 2+. The electron localization indicator (ELI) indicates two-center Bi-Bi bonds as well as multi-center bonds inside the metallic part, whereas the bismuth lone-pairs point towards the non-conducting part of the structure.
Details
Original language | English |
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Pages (from-to) | 1979-1985 |
Number of pages | 7 |
Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
Volume | 635 |
Issue number | 12 |
Publication status | Published - Oct 2009 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-2391-6025/work/159171940 |
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Keywords
ASJC Scopus subject areas
Keywords
- Bismuth, Confined metals, Metal-salt-hybrids, Modulated crystal structures, One-dimensional metals, Palladium