文摘
The reaction between Ru2(ap)4-C鈮-4-C6H4-P(O)(Op>tp>Bu)2 and LiC2X afforded trans-XC2-Ru2(ap)4-C鈮-4-C6H4鈥揚(O)(Op>tp>Bu)2, where X is 鈭扴iMe3 (1), 鈭扖2SiMe3 (2), 鈭扖4H (3), or 鈭?-C6H4C2SiMe3 (4). Compound 5, trans-(p>tp>BuO)2(O)P-C6H4-4-C鈮-Ru2(ap)4-C鈮-4-C6H4SC2H4SiMe3, was obtained from the reaction between Ru2(ap)4-C鈮-4-C6H4SC2H4SiMe3 and excess LiC鈮-4-C6H4-P(O)(Op>tp>Bu)2. Compounds 1鈥?b>5 were characterized by elemental analysis, HR-nESI-MS, voltammetric and spectroscopic techniques, and the X-ray diffraction study of 2. The electronic structures of the homologous series 1鈥?b>3 were investigated using DFT calculations, which revealed both the retention of key features of Ru2 electronic structure upon the introduction of phosphonate capping and subtle dependence on the number of acetylene units (n) across the series.