Unusual cationic rhodathiaboranes: synthesis and characterization of [8,8,8-(H)(PR<sub>3</sub>)<sub>2</sub>-9-(Py)-nido-8,7-RhSB<sub>9</sub>H<sub>10</sub>]<sup>+</sup>and [1,3-μ-(H)-1,1-(PR<sub>3</sub>)<sub>2</sub>-3-(Py)-isonido-1,2-RhSB<sub>9</sub>H<sub>8</sub>]<sup>+</sup>
作者:Beatriz Calvo、Ramón Macías、Maria Jose Artigas、Fernando J. Lahoz、Luis A. Oro
DOI:10.1039/c3dt52018h
日期:——
The treatment of the hydridorhodathiaboranes, [8,8,8-(H)(PR3)2-9-(Py)-nido-8,7-RhSB9H9], where PR3 = PPh3 (2), PMePh2 (3), PPh3 and PMe2Ph (4), or PMe3 and PPh3 (5), and [8,8,8-(H)(PMePh2)2-9-(PMePh2)-nido-8,7-RhSB9H9] (6), with TfOH affords [8,8,8-(H)(PR3)2-9-(Py)-nido-8,7-RhSB9H10]+ cations, where PR3 = PPh3 (12), PMePh2 (13), PPh3 and PMe2Ph (14), or PMe3 and PPh3 (15), and [8,8,8-(H)(PMePh2)2-9-(PMePh2)-nido-8,7-RhSB9H10]+ (16). Compounds 13 and 14 lose H2 to give [1,3-μ-(H)-1,1-(PR3)2-3-(Py)-isonido-1,2-RhSB9H8]+, where PR3 = PMe2Ph (18), PPh3 and PMe2Ph (21), or PMePh2 (22). Similarly, the 11-vertex rhodathiaboranes, [1,1-(PR3)2-3-(Py)-1,2-RhSB9H8], where PR3 = PPh3 (7), PMe2Ph (8), PMe3 (9), or PPh3 and PMe3 (10), react with TfOH to give the corresponding cations, [1,3-μ-(H)-1,1-(PR3)2-3-(Py)-isonido-1,2-RhSB9H8]+, where PR3 = PPh3 (17), PMe2Ph (18), PMe3 (19), or PPh3 and PMe3 (20). Four conformers of 20 are studied by X-ray diffraction methods and DFT-calculations, identifying packing motifs that stabilize different metalâthiaborane linkages, and energy variations that are involved in these conformational changes. It is demonstrated that the proton induces nonrigidity on these clusters as well as an enhancement of their Lewis acidity.
氢桥配位的二
苄基苯膦与
吡啶配位的
硼硫合
铑化合物[8,8,8-(H)(PR3)2-9-(Py)-nido-8,7-Rh
SB9H9],其中PR3 = PPh3 (2),
PMePh2 (3), PPh3和
PMe2Ph (4), 或
PMe3和PPh3 (5), 以及[8,8,8-(H)(
PMePh2)2-9-(
PMePh2)-nido-8,7-Rh
SB9H9] (6),与TfOH反应生成阳离子[8,8,8-(H)(PR3)2-9-(Py)-nido-8,7-Rh
SB9H10]+, 其中PR3 = PPh3 (12),
PMePh2 (13), PPh3和
PMe2Ph (14), 或
PMe3和PPh3 (15), 以及[8,8,8-(H)(
PMePh2)2-9-(
PMePh2)-nido-8,7-Rh
SB9H10]+ (16)。化合物13和14失去H2,生成阳离子[1,3-μ-(H)-1,1-(PR3)2-3-(Py)-isonido-1,2-Rh
SB9H8]+,其中PR3 =
PMe2Ph (18), PPh3和
PMe2Ph (21), 或
PMePh2 (22)。类似地,11个顶点的
铑硫合
硼化合物[1,1-(PR3)2-3-(Py)-1,2-Rh
SB9H8],其中PR3 = PPh3 (7),
PMe2Ph (8),
PMe3 (9), 或PPh3和
PMe3 (10),与TfOH反应生成相应的阳离子[1,3-μ-(H)-1,1-(PR3)2-3-(Py)-isonido-1,2-Rh
SB9H8]+,其中PR3 = PPh3 (17),
PMe2Ph (18),
PMe3 (19), 或PPh3和
PMe3 (20)。化合物20的四种构象通过X射线衍射方法和DFT计算进行研究,识别出稳定不同
金属-
硫硼键的排布模式,以及这些构象变化所涉及的能量变化。研究表明,质子诱导这些簇合物的非刚性化,并增强了它们的Lewis酸性。