B‐Octamethyl‐[12]Mercuracarborand‐4 as Host for “Naked” Fluoride Ions

Fluoride Ion Recognition by Chelating and Cationic Boranes

“…The latter is well within the sum of the van der Waals radii of the two elements and is, in fact, comparable to the distances observed in a fluoride adduct of a tetranuclear mercuracarborand (2.56 and 2.65 Å). 23 In addition to being compatible with aqueous environments, such compounds possess unusual photophysical properties, which can be used to signal anion binding. As Hudnall et al demonstrated in the case of 11, the unsaturated boron center mediates conjugation of the naphthalenediyl and mesityl substituents that collectively behave as a single chromophore.…”

Aspects of secondary bonding intramolecular interaction in organomercury and organochalcogen derivatives

“…4b These mercuracarborands and their derivatives can readily form complexes with halide ions, nitrate ion and tetrahydrofuran. 5 The Lewis acidity of organomercurials can be further improved by attaching suitable electronegative substituents such as fluoro group to the organic substrate. There are numerous examples in literature which document the use of fluoroorganomercurials as electrophilic hosts for anions and electron-rich neutral molecules.…”

3 Boron

“…70 The octamethyl-substituted [12]mercuracarborand-4, which consists of 4 divalent [C 2 B 10 H 8 Me 2 ] cages linked by four Hg atoms in a cyclic tetramer, has been synthesised and its utility as a host for F 2 and a source of 'naked-fluoride' has been investigated. 71 Hawthorne investigated the synthesis and metal-metal communication in a series of s-bonded bis-metallated carborane complexes [{CpFe(CO) 2 } 2 -1,12-C 2 B 10 H 10 ] and [{CpFe(CO) 2 } 2 -1,10-C 2 B 8 H 8 ]. Cyclic voltammetry has been used to examine the extent the metal-metal communication between the metal centres.…”