[B(CO 2 H) 4 ] − and [B(CNCH 3 ) 4 ] 3+ : Homoleptic Boron Complexes Containing Carboxy and Methylisocyanide Ligands

Series clincher : The synthesis of salts of the [B(CO 2 H) 4 ] − ion and the [B(CNCH 3 ) 4 ] 3+ ion starting from [ n Bu 4 N][B(CN) 4 ] are described. Thus, the series including [B(CN) 4 ] − , [B(CO 2 H) 4 ] − , and [B(CF 3 ) 4 ] − has now been completed. The figure shows the [B(CO 2 ) 2 (CO 2 H) 2 ] 3− ion in [Co(NH 3 ) 6 ][B(CO 2 ) 2 (CO 2 H) 2 ]⋅2 H 2 O (O red, C black, B yellow, H white).