Ag₁₃OsO₆: A Silver Oxide with Interconnected Icosahedral Ag₁₃⁴⁺ Clusters and Dispersed [OsO₆]⁴⁻ Octahedra

Abstract

ZuschriftenDer Ag 13 OsO 6 -Komplex enthält isolierte ikosaedrische Ag 13 4+ -Cluster, in denen das zentrale Silberion ausschließlich mit anderen Silberionen verknüpft ist. Die elektronische Struktur dieses einzigartigen Komplextyps beschreiben M. Jansen et al. auf den folgenden Seiten.

Ag3Ni2O4—A new stage-2 intercalation compound of 2H–AgNiO2 and physical properties of 2H–AgNiO2 above ambient temperature

“…Indeed, a number of them have been realized till now, showing various structural motives and oxidation states of silver. Ag 13 OsO 6 contains silver atom centered icosahedra Ag 4þ 13 with silver in the subvalent state of +4/13 [3]. A two-dimensional arrangement in the form of 1 2 Ag þ 2 layers, which can again be seen as a section of elemental silver metal, was found previously in the binary fluoride Ag 2 F [4].…”

Ratcheting Upvir Gene Expression inAgrobacterium tumefaciens: Coiled Coils in Histidine Kinase Signal Transduction

“…[7, 8] Indeed, few examples of such subvalent compounds have been reported, e.g. Ag 2 F,9 Ag 3 O,10 Ag 5 Pb 2 O 6 , [11, 12] Ag 5 SiO 4 ,13 Ag 2 NiO 2 ,14 and Ag 13 OsO 6 15. The underlying structural characteristics sometimes induce special physical properties, e.g.…”

Honeycomb‐Layered Oxides With Silver Atom Bilayers and Emergence of Non‐Abelian SU(2) Interactions

“…From a chemical perspective, the formation of Ag‐atom bilayered structures (as shown in Figures 2 and ) can be attributed to the tendency of $$\rm Ag$$ to assume anomalous valency states (also referred to as sub‐valent states) such as oxidation states between 0 and 1 + . As a result, the $$\rm Ag$$ ions aggregate to form atomic coordinations (i.e., $$\rm Ag-Ag^{\prime }$$ bonds) resemblant of silver metal (metallic silver) topologies, [ 30,41–44 ] which in principle violate conventional bonding mechanisms and electronic structures. In general, the constituent elements of the present global compositions can be assigned to the valency states of $$\rm Ni^{2+}$$, $$\rm Ag^{1+}$$, and $$\rm Te^{6+}$$ to yield a valency description of $$\rm Ag_2^{1+}Ni_2^{2+}Te^{6+}O_6^{2-}$$.…”

“…[ 30,36,64,65 ] Indeed, this is the case for $$\rm Ag_3^{1+}Ni_2^{2+}Bi^{5+}O_6^{2-}$$, whereby the $$\rm Ag$$ atom is monovalent, and the lattice is not only monolayered but triangular, [ 38 ] in contrast to the present material reported herein. Meanwhile, the $$\rm Ag$$ sub‐valent state $$1/3+$$ remains conspicuously absent in reported layered materials [ 30,36,64 ] and other silver‐rich oxides, [ 41–43,71–77 ] despite its presence reported, e.g., in $$\rm Ag_3^{1/3+}O^{2-}H^{1+}$$. [ 78 ] Finally, although the sub‐valency of silver remains unascertained in the present material via direct XPS measurements of $$\rm Ag$$ binding energies, the fact that the $$\rm Ag$$‐rich domains are bilayered with an apparent bifurcated bipartite honeycomb lattice demonstrates that such domains fit well within the aforementioned class of bilayered sub‐valent $$\rm Ag$$‐based frameworks, thus corroborating the charge neutrality argument provided earlier for the sub‐valency of $$\rm Ag$$.…”

“…), amongst others. [30][31][32][33][34][35][36][41][42][43][44] In a bid to gain insights into the peculiar structural dispositions of Ag-atoms, we report for the first time the synthesis and structural characterisation of honeycomb-layered tellurates with global compositions, Ag 2 M 2 TeO 6 (M = Ni, Mg, and other transition metal atoms) exhibiting Ag atom bilayers within Ag-rich crystalline domains of Ag 6 M 2 TeO 6 . Through aberrationcorrected scanning transmission electron microscopy, we report and elucidate the intricate atomic disordered structure of Ag 6 M 2 TeO 6 , which is noted to predominantly comprise triangular Ag-atom bilayer lattices sandwiched between transition metal slabs with an aperiodic stacking sequence.…”