ChemInform Abstract: Synthesis and Structure of K2Au3, a New Phase in the Potassium‐Gold System.

Abstract

The title compound is prepared by annealing a mixture of the elements (1000 °C, 2 h, sealed Ta‐ampoule, argon).

A Photoelectron Spectroscopic and Computational Study of Sodium Auride Clusters, NanAun- (n = 1−3)

“…12 The insulating CsAu and RbAu crystallize in the cubic CsCl structure, whereas the structures of the metallic NaAu and KAu are more complicated and are still not fully elucidated. [10][11][12][13][14][15] Solid CsAu possesses an indirect band gap of 2.6 eV, 16 which can only be modeled when relativistic effects are included in bandstructure calculations. 17,18 NaAu has been synthesized by precipitation from liquid ammonia solutions and observed in rapidly quenched alloys.…”

R14(Au, M)51 (R = Y, La–Nd, Sm–Tb, Ho, Er, Yb, Lu; M = Al, Ga, Ge, In, Sn, Sb, Bi): Stability Ranges and Site Preference in the Gd14Ag51 Structure Type

“…The varied bonding capabilities and size of gold also provide a prime opportunity for the incorporation of slight structural changes akin to the substitution of various group 13–15 elements. Examples of gold’s flexibility in structure and bonding are numerous, including the formation of quasicrystals, their approximants and related crystalline formations with crystallographically forbidden symmetries, along with various homoatomic gold assemblies. − Such motifs comprise isolated Au 7 clusters as found in A 4 Au 7 X 2 (A = K, Rb, Cs; X = Ge, Sn), , one-dimensional columns such as Au zigzag chains like in Ca 3 Au 3 In, and two-dimensional slabs which are observable in K 2 Au 3 . Three dimensional gold networks also form in several arrangements: interconnected trigonal bipyramids are found in KAu 5 , hexagonal diamond-like frameworks of Au are the characteristic structural motifs in the Ae-Au-Tr (Ae = alkaline earth, Tr = triel element) systems, − and assemblies of tetrahedral and square planar Au fragments are observed in Rb 3 Au 7 …”

R3Au9Pn (R = Y, Gd–Tm; Pn = Sb, Bi): A Link between Cu10Sn3 and Gd14Ag51

“…The well-studied relativistic effects on gold’s 5d and 6s orbitals often produce notable structural and bonding features, which make it an advantageous component in the search for new intermetallic compounds. − Examples of gold’s versatility in structure and bonding are extensive and include quasicrystals and their approximates, − as well as unique gold assemblies. Some examples include isolated Au 7 clusters in A 4 Au 7 X 2 ( A = K, Rb, Cs; X = Ge, Sn), , one-dimensional columns such as Au zigzag chains in Ca 3 Au 3 In, and two-dimensional slabs that are found in K 2 Au 3 . Three-dimensional gold networks are found in multiple forms such as interconnected trigonal bipyramids found in KAu 5 , hexagonal-diamond-like frameworks of Au as seen in the series of Ae -Au- Tr systems, ,− and combinations of tetrahedral and square-planar Au fragments in Rb 3 Au 7 …”