The synthesis of [Me{sub 4}N]{sub 2}[alpha{sup 2}-B{sub 20}H{sub 16}(NH{sub 3}){sub 2}] and trans-B{sub 20}H{sub 16}(NH{sub 3}){sub 2} from [Me{sub 3}NH][cis-B{sub 20}H{sub 17}NH{sub 3}] and their structural characterization
The chemistry of novel polyhedral borane derivatives has recently attracted new interest because of their potential application in the liposome-mediated boron neutron capture therapy (BNCT) of cancer. The [trans-B{sub 20}H{sub 18}]{sup 2{minus}} polyhedral borane anion has been found to be a versatile source for a variety of these boron-rich derivatives. The synthesis of the stereochemically unprecedented [cis-B{sub 20}H{sub 18}]{sup 2{minus}} and the ammonio-substituted anion [cis-B{sub 20}H{sub 17}NH{sub 3}]{sup {minus}} ([2]{sup {minus}}) has been reported. The two three-center two-electron bonds of [2]{sup {minus}} are electron deficient and susceptible to nucleophilic attack, and the reaction of [2]{sup {minus}} with hydroxide ion produced disubstituted [{alpha}{sup 2}-B{sub 20}H{sub 16}NH{sub 3}(OH)]{sup 3{minus}}. A recent investigation of the reaction of [2]{sup {minus}} with liquid ammonia has led to the discovery of the diammonio-substituted anion, [{alpha}{sup 2}-B{sub 20}H{sub 16}(NH{sub 3}){sub 2}]{sup 2{minus}}. Subsequent aqueous ferric ion oxidation resulted in the neutral derivative, trans-B{sub 20}H{sub 16}(NH{sub 3}){sub 2}. They report here the syntheses and structures of the anion and the neutral compound.
- Research Organization:
- Univ. of California, Los Angeles, CA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG03-95ER61975
- OSTI ID:
- 20003207
- Journal Information:
- Inorganic Chemistry, Vol. 38, Issue 22; Other Information: PBD: 1 Nov 1999
- Country of Publication:
- United States
- Language:
- English
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