Superacid Anions:  Crystal and Molecular Structures of Oxonium Undecafluorodiantimonate(V), [H₃O][Sb₂F₁₁], Cesium Fluorosulfate, CsSO₃F, Cesium Hydrogen Bis(fluorosulfate), Cs[H(SO₃F)₂], Cesium Tetrakis(fluorosulfato)aurate(III), Cs[Au(SO₃F)₄], Cesium Hexakis(fluorosulfato)platinate(IV), Cs₂[Pt(SO₃F)₆], and Cesium Hexakis(fluorosulfato)antimonate(V), Cs[Sb(SO₃F)₆]

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Synthesis and Characterisation of Alkali Metal and Thallium Polyfluoroantimonates, ASbnF5n+1 (n = 2, 3)

“…The first group corresponds to ASb 2 F 11 compounds having similarly sized cations (A = K + , H 3 O + , Ag + ). Crystals of KSb 2 F 11 are orthorhombic at 250 K (see Experimental Section) and are isostructural to AgSb 2 F 11 5 and also structurally related to H 3 OSb 2 F 11 9. The complex structure of KSb 2 F 11 reveals three crystallographically nonequivalent Sb 2 F 11 – anions that are highly distorted from ideal D 4 h symmetry (Figure 1).…”

“…Taking the coordination number as the number of nearest neighbour atoms9 then Cs is surrounded by 12 fluorine atoms at distances of between 307.0(4) and 355.2(4) pm. In CsSbF 6 twelve fluorine atoms again surround the Cs atom with six close contacts (311.6 pm) and six long contacts (338.3) pm 11…”

Predominantly σ‐Bonded Metal Carbonyl Cations (σ‐Carbonyls): New Synthetic, Structural, and Bonding Concepts in Metal Carbonyl Chemistry

“…As in the early examples cited,3, 6, 15 the superacid ion [Sb 2 F 11 ] − ,16 formed by self‐assembly in liquid SbF 5 as well as in HFSbF 5 ,16 is frequently found as a counterion. The resulting salts have high thermal stabilities, with decomposition points usually well beyond 100 °C.…”

“…Correspondingly, Cu + and Ag + salts with weakly coordinating anions will readily add CO stepwise in aprotic solvents 38, 39. There are, however, two important differences: The formation of polycarbonyls occurs; this is without precedent in metal carbonyl chemistry 10–12, 16–20. The composition of these polycarbonyls is controlled by temperature and CO pressure.…”

Chitosan‐Templated Synthesis of Few‐Layers Boron Nitride and its Unforeseen Activity as a Fenton Catalyst

“…200 results, most of which refer to mixed fluoride/sulfate compounds and not to those containing genuine anions of fluorosulfuric acid, HSO 3 F. A query of the structural databases revealed only thirteen distinct entries representing quasibinary metal derivatives M(SO 3 F) x (those of Li,1 Na,2 K,3 Rb,2,4 Cs,5,6,7 Tl,2 Ag I ,8 Ag II ,9 Sn II ,10 and Au III ) 11. Mixed‐cation (i.e., quasiternary) salts of fluorosulfuric acid [M (1) x M (2) y (SO 3 F) z ] have been even less carefully scrutinized, and only three Cs–Au, Cs–Pt, and Cs–Sb derivatives have been structurally described 7. This lack of structural information is surprising as the fluorosulfate anion is considered to be rather weakly coordinating (similarly to the triflate anion) and, therefore, it could be used as a component of solids containing quite reactive (“naked”) metal centers.…”