9-Borafluorene derivatives 1 (9-R = Et (a), Ph (b), Cl (c), NEt2 (d)), the pyridine adduct 1py+ and 1,2-(2,2′-biphenylylene)-1,2-diethyldiborane(6) (3), were studied by 11B and 13C NMR spectroscopy to obtain a fairly complete data set for the first time. The molecular structure of the doubly hydrogen-bridged 1,2-diphenylenediborane 3 was determined by X-ray diffraction. The gas-phase structures of the compounds 1, related derivatives, and of some doubly hydrogen-bridged 1,2-diphenylenediboranes were optimized by quantum chemical calculations (B3LYP/6-311+G(d,p) level of theory) and NMR parameters, such as chemical shifts, 11B chemical shift tensors and indirect nuclear 13C–11B spin–spin coupling constants were calculated at the same level of theory and compared with experimental data.
9-
硼芴衍
生物1(9-R = Et(a),Ph(b),Cl(c),NEt2(d)),
吡啶加合物1py+和1,2-(2,2′-
联苯基)-1,2-
二乙基二
硼烷(6)(3),首次通过11B和13C核磁共振光谱研究,获得了相当完整的数据集。双氢桥联的1,2-二苯基二
硼烷3的分子结构由X射线衍射确定。化合物1、相关衍
生物以及一些双氢桥联的1,2-二苯基二
硼烷的气相结构通过量子
化学计算(B3LYP/6-311+G(d,p)
水平)进行了优化,并且在相同的理论
水平下计算了NMR参数,如
化学位移、11B
化学位移张量和间接核13C-11B自旋-自旋耦合常数,并与实验数据进行了比较。