Improving the Solubility of Halogenated 1-Ammonio-closo-dodecaborate Anions.

The partly halogenated and N-alkylated closo-dodecaborates [BClHN(propyl)] and [BBrHNR] (R = ethyl-pentyl) were prepared by alkylation of [BHNH] and subsequent halogenation with elemental chlorine or N-bromosuccinimide. Simple metathesis reactions yielded the [HNMe], [Cmim], [NBu], and Na salts, which were characterized by heteronuclear NMR and IR spectroscopy as well as electrospray ionization mass spectrometry. The crystal structures of the salts [HNMe][BBrHN(ethyl)]·CHCN, [HNMe][BBrHN(propyl)], Na[BBrHN(butyl)], and [HNMe][BClHN(propyl)]·CHCN were determined by single-crystal X-ray diffraction.

The Me NB Cl Radical: A Strong One-Electron Oxidizing Agent.

Strong oxidizing agents often contain fluorine and are not compatible with substrates forming strong element-fluorine bonds. Therefore, there is need for new strong oxidizers. Cyclic voltammetric measurements on the weakly coordinating anion [Me NB Cl ] in liquid SO revealed an oxidation wave at +2.

Theoretical and Synthetic Study on the Existence, Structures, and Bonding of the Halide-Bridged [B2X7](-) (X = F, Cl, Br, I) Anions.

While hydrogen bridging is very common in boron chemistry, halogen bridging is rather rare. The simplest halogen-bridged boron compounds are the [B2X7](-) anions (X = F, Cl, Br, I), of which only [B2F7](-) has been reported to exist experimentally. In this paper a detailed theoretical and synthetic study on the [B2X7](-) anions is presented.