Synthesis and Characterization of Terpyridine-Supported Boron Cations: Evidence for Pentacoordination at Boron

Hypervalent
boron centers are proposed to be key intermediates in many stoichiometric
and catalytic reactions. However, structurally characterized examples
remain rare. We have isolated two new borocations with formal charges
of 1+ and 2+. Because the dicationic complex displays evidence of
pentacoordination at the boron center, we conclude that the interaction
is predominantly electrostatic and is a result of the highly electrophilic
dicationic boron atom.

超价硼中心（Hypervalent boron centers）被提出为众多化学计量反应与催化反应中的关键中间体。然而，经结构表征的此类实例仍较为罕见。我们成功分离得到两种形式电荷分别为+1与+2的新型硼阳离子。鉴于该双阳离子配合物在硼中心处表现出五配位特征，我们推断其相互作用主要为静电相互作用，该特性源于该高度亲电的双阳离子硼原子。