| 摘要 |
The invention provides new methods for synthesis of large boron hydride clusters e.g., boron hydride molecules of the formula B<SUB>n</SUB>H<SUB>m </SUB>where 5<=n<=96 and m<=n+8, wherein m and n satisfy the electron counting rules of macropolyhedral boranes. The invention is particularly useful for synthesis of octadecaborane (B<SUB>18</SUB>H<SUB>22</SUB>). Preferred methods of the invention include iteratively generating a conjugate acid from a salt of the [B<SUB>a</SUB>H<SUB>b</SUB>]<SUP>c-</SUP> or [B<SUB>n+2</SUB>H<SUB>m-4</SUB>]<SUP>2-</SUP> anion followed by degradation under conditions conducive to concentrating and drying of the conjugate acid to provide a borane B<SUB>n</SUB>H<SUB>m </SUB>and residual salt of the [B<SUB>a</SUB>H<SUB>b</SUB>]<SUP>c-</SUP> or [B<SUB>n+2</SUB>H<SUB>m-4</SUB>]<SUP>2-</SUP> anion which is reused in the method of synthesis. The invention further provides isotopically enriched boranes, particularly isotopically enriched <SUP>10</SUP>B<SUB>18</SUB>H<SUB>22 </SUB>and <SUP>11</SUP>B<SUB>18</SUB>H<SUB>22</SUB>.
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