M(CO)4 (M = Mo or W) complexes of 2,6-bis(methylthiomethyl)pyridine (L1) and 2,6-bis(p-tolylthiomethyl)pyridine (L2): a dynamic NMR study
作者:Edward W. Abel、Elizabeth S. Blackwall、Michel L. Creber、Peter J. Heard、Keith G. Orrell
DOI:10.1016/0022-328x(94)05192-e
日期:1995.3
The hybrid S/N/S donor ligands 2,6-bis(methylthiomethyl)pyridine (L1) and 2,6-bis(p-tolylthiomethyl)pyridine (L2) react with the [M(CO)5(THF)] (M = Mo or W) compounds to form complexes of general formula [M(CO)4L] (M = Mo, L = L2; M = W, L = L1 or L2), where both L1 and L2 act in a S/N bidentate chelate fashion. In solution, these complexes undergo three fluxional processes, viz. inversion at the coordinated
杂种S / N / S供体配体2,6-双(甲硫基甲基)吡啶(L 1)和2,6-双(对甲苯甲硫基甲基)吡啶(L 2)与[M(CO)5(THF)反应](M = Mo或W)化合物形成通式[M(CO)4 L](M = Mo,L = L 2 ; M = W,L = L 1或L 2)的配合物,其中L 1 L 2和L 2以S / N二齿螯合物的方式起作用。在溶液中,这些络合物经历三个流动过程,即。在配位的S原子上发生反演,S 1 –S 2切换以及组合反演和S 1 –S 2转换,导致四种可能的排列异构体相互转换。通过标准的一维带状分析技术已经评估了这三个过程的能垒。讨论了S 1 –S 2开关的机制。