Mg₃Pt₂: Anionic Chains in a Eu₃Ga₂-Type Structure

Abstract

The binary phase Mg 3 Pt 2 was prepared by direct reaction between the elements or by spark-plasma synthesis starting with MgH 2 and PtCl 2 . The compound crystallizes in the monoclinic space group C 2/ c with a = 7.2096(3) Å, b = 7.1912(4) Å, c = 6.8977(3) Å, and β = 106.072(3)° and is isotypic to Eu 3 Ga 2 . Analysis of the electron density within the quantum theory of atoms in molecules shows a significant charge transfer from Mg to Pt in agreement with the electronegativity difference. Further study of the chemical bonding with the electron localizability approach reveals the formation of Pt chains stabilized by a complex system of multicenter interactions involving Mg and Pt species. The metallic character of Mg 3 Pt 2 is confirmed by electronic structure calculations and physical measurements.

Semiconducting and Metallic Compounds within the IrIn3 Structure Type: Stability and Chemical Bonding

“…The observed diversity and complexity of intermetallic frameworks hinder the interpretation of chemical bonding due to intricate patterns that involve multicenter interactions. Only recently, direct-space analysis was established for the proper treatment of multicenter patterns of chemical bonding. − …”

Real Structure, Magnetism and Chemical Bonding of SmSi3−x

“…For these basin populations, Si1 provides around ~94 % of the charge and the Si2 contributions amount to ~92 %. In Zintl‐phases and related compounds, such findings are attributed to the presence of strongly polar multiatomic bonds [48,49] …”

K2BaSi4: Zintl Concept in Position Space

“…In detail, the Si1À Si2 bonds do not display the expected bond basins, the Si1 atom shows only one ELIÀ D basin involving the 'lone-pair' part, and two Si1À Si2 bond basins, which is rather characteristic for clusters with less directed, multi-atomic bonds and absence of an energy gap at the Fermi level in the band structure, e. g. Mg 3 Pt 2 . [28] At the end, structure model 1 was finally dismissed also from further considerations as discussed in the following.…”