On the Stability of Trimeric Beryllium Hydroxide Scorpionate Complexes

The controlled hydrolysis of TpBeCl {Tp = trispyrazolylborate [HB(C 3 N 2 H 3 ) 3 ] – } with H 2 O and D 2 O in the presence of N , N ‐diisopropylethylamine (DIPEA) yields the trimeric beryllium hydroxide scorpionate complexes [Be 3 (µ‐OX) 3 (Tp) 3 ] (X = H: 1 , D: 2 ) quantitatively. The complexes contain six‐membered Be 3 O 3 rings according to single‐crystal X‐ray diffraction studies and theoretical calculations. Temperature‐dependent 1 H and 9 Be NMR spectroscopy established that 1 has a dynamic structure in solution. In addition, the structure of [Be 3 (µ‐OH) 3 (Br) 3 (thf) 6 ], which was obtained from hydrolysis of a solution of BeBr 2 in tetrahydrofuran and CHCl 3 , is reported.