The versatile chemistry of the [B20H18]2– ions: novel reactions and structural motifs
| Autor: | M. Frederick Hawthorne, Kenneth Shelly, Fangbiao Li |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Boron Compounds
Substitution reaction Reaction mechanism Molecular Structure Chemistry Hydride Metals and Alloys Boron Neutron Capture Therapy Stereoisomerism Protonation General Chemistry Catalysis Surfaces Coatings and Films Electronic Optical and Magnetic Materials Ion Crystallography Nucleophile Materials Chemistry Ceramics and Composites Humans Organic chemistry Reactivity (chemistry) Boranes Structural motif |
| Zdroj: | Chemical Communications. :547-554 |
| ISSN: | 1364-548X 1359-7345 |
| Popis: | Among the polyhedral [closo-BnHn]2− ion series (n = 5–12 inclusive) the aromatic [closo-B10H10]2− ion is both readily available and quite reactive. Among its many reactions which retain its cage structure one finds the oxidative dimerization reaction in which two [closo-B10H12]2− ions each formally lose a hydride ion and undergo dimerization of the resulting [closo-B10H9]− ions to produce the [trans-B20H18]2− ion. The two-component [closo-B10H9]− ions of the latter are linked together by a pair of unique B–B–B bonds which provide unprecedented reactivity to the structure. Among these reactions are the two-electron reduction to a set of three interconvertible [B20H18]4− ions having intercage B–B bonds and the related reductive substitution reaction in which [trans-B20H18]2− undergoes attack by nucleophile, L, to produce [B20H18L]2−. The latter species is formally a substituted [B20H19]3− (L = H) ion formed by B–B bond protonation of one of the isomeric [B20H18]4− ions. These and a variety of novel reactions are described here along with interrelated reaction mechanisms considered for the first time. |
| Databáze: | OpenAIRE |
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