Increasing the solubility of strong reducing agents containing Mo24+ units and alkyl-substituted guanidinate ligands
作者:F. Albert Cotton、Carlos A. Murillo、Xiaoping Wang、Chad C. Wilkinson
DOI:10.1039/b707201e
日期:——
Six very soluble paddlewheel compounds containing Mo2n+ units, n = 4, 5, 6, and two alkyl-substituted bicyclic guanidinate ligands have been synthesized. The quadruply bonded complexes with n = 4, Mo2(TMhpp)4 and Mo2(TEhpp)4, (TMhpp = the anion of 3,3,9,9-tetramethyl-1,5,7-triazabicyclo[4.4.0]dec-4-ene and TEhpp = the anion of 3,3,9,9-tetraethyl-1,5,7-triazabicyclo[4.4.0]dec-4-ene) are easily oxidized. The electrode potentials in THF are −1.08 and −1.17 V vs. Ag/AgCl, respectively, for the Mo25+/4+ couple. These potentials are in accord with the low ionization potentials for the quadruply bonded compounds. Because of the high solubility of the Mo24+ compounds in most common organic solvents they are attractive candidates for use as strong reducing agents in homogeneous systems.
合成了六种溶解度很高的桨轮化合物,其中含有 Mo2n+ 单元(n = 4、5、6)和两个烷基取代的双环胍配体。 n = 4、Mo2(TMhpp)4 和 Mo2(TEhpp)4 的四键配合物,(TMhpp = 3,3,9,9-四甲基-1,5,7-三氮杂双环[4.4.0]dec 的阴离子-4-ene和TEhpp = 3,3,9,9-四乙基-1,5,7-三氮杂双环[4.4.0]dec-4-ene的阴离子)很容易被氧化。对于 Mo25+/4+ 电对,THF 中的电极电位相对于 Ag/AgCl 分别为 -1.08 和 -1.17 V。这些电势与四键化合物的低电离电势一致。由于 Mo24+ 化合物在大多数常见有机溶剂中具有高溶解度,因此它们是在均相体系中用作强还原剂的有吸引力的候选者。