posted on 2013-09-23, 00:00authored byWei Dai, Matthew J. Chalkley, Gary W. Brudvig, Nilay Hazari, Patrick R. Melvin, Ravi Pokhrel, Michael K. Takase
The
synthesis of a family of new Pd(I) dimers, (μ-All)(μ-Cp){Pd(IPr)}2 (All = C3H5, Cp = C5H5, IPr = 1,3-bis(2,6-diisopropylphenyl)-1,3-dihydro-2H-imidazol-2-ylidene), (μ-All)(μ-Ind){Pd(IPr)}2 (Ind = C7H9), (μ-Cp)(μ-Cp){Pd(IPr)}2, (μ-Cp)(μ-Ind){Pd(IPr)}2, and (μ-Ind)(μ-Ind){Pd(IPr)}2, which contain a combination of bridging allyl, Cp, and indenyl
ligands and are all supported by IPr as the ancillary ligand, is reported.
All of these compounds are thermally stable at room temperature, and
the solid-state geometries, electronic structures, reactivity, and
redox chemistry of these new compounds have been compared with those
of the dimer (μ-All)2{Pd(IPr)}2, which
was previously reported. This work provides further evidence that
bridging allyl, Cp, and indenyl ligands bind in a similar manner to
Pd(I). However, it is demonstrated that there are notable differences
between the IPr-supported species and related Pd(I) dimers with triethylphosphine
ancillary ligands, which have been previously described.