Gold tetrahedra as building blocks in K ₃Au ₅Tr (Tr=In, Tl) and Rb ₂Au ₃Tl and in other compounds: A broad group of electron-poor intermetallic phases

The alkali-metal gold trielides K ₃Au ₅Tr (Tr = ln (I), Tl (II)) and Rb ₂Au ₃Tl (III) have been obtained directly from the elements, and their orthorhombic structures determined by single-crystal X-ray diffraction means (I/II: lmma, a = 5.562(1), 5.595(1); b = 19.645(4), 19.706(4); c = 8.502(2), 8.430(2) A; Z= 4, respectively; III: Pmma, a = 5.660(1), b = 6.741 (1), c=9.045(2) Å Z=4). These exhibit zigzag chains of Tr that link puckered sheets (I/II) or chains (III) of gold tetrahedra condensed through shared vertices. The segregation of Au and Tr components Is striking relative to the evidently stronger and preferred Au-Tr bonding In neighboring gold- and alkali-metal-poorer triel phases. The close packing of K/Rb (A) about the gold tetrahedra gives each A and Au ₄ component 7-10 and 10 neighbors of the other type, respectively. Tight-binding-linear- muffin-tin-orbital-atomic sphere approximation band structure calculations show that the title phases lie near or at electronic pseudogaps. The gold substructure is the dominant feature of the densities of states, with moderately broad 5d ¹⁰ features as favored by relativistic effects. Likewise, crystal orbital Hamilton population results indicate optimization of Au-Au bonding at the expense of the stronger heteroatomlc Au-Tr interactions. Stabilization of these unusual structures appears to follow In part from the presence of numerous short and individually weak A-Au Interactions, as manifested by appreciable mixing of s, p, and d valence orbitais on A into network bonding states, Au 5d in particular. These and related phases define a family of Au ₄-based phases with particularly low el a values of 1.2~2.3 (over all atoms, omitting Au 5d), closely related to the cubic Laves-type structures. The same region also contains Tr-richer tunnel and network structures with relatively fewer cations that also appear to be dominated by Au-Au and Au-Tr bonding.