期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 28, 期 38, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202200344
关键词
heterometallic complexes; Lewis acids; macrocyclic ligands; molecular electrochemistry; palladium
资金
- US Department of Energy, Office of Science, Office of Basic Energy Sciences through the Early Career Research Program [DE-SC0019169]
- U.S. Department of Energy (DOE) [DE-SC0019169] Funding Source: U.S. Department of Energy (DOE)
This paper reports the isolation and characterization of a series of heterobimetallic complexes of palladium with redox-inactive metal ions. The distance between the ions depends on the Lewis acidity of the redox-inactive metal ions, and the reduction of the complexes is modulated by Lewis acidity.
Incorporation of redox-inactive metals into redox-active complexes and catalysts attracts attention for engendering new reactivity modes, but this strategy has not been extensively investigated beyond the first-row of the transition metals. Here, the isolation and characterization of the first series of heterobimetallic complexes of palladium with mono-, di-, and tri-valent redox-inactive metal ions are reported. A Reinhoudt-type heteroditopic ligand with a salen-derived [N-2,O-2] binding site for Pd and a crown-ether-derived [O-6] site has been used to prepare isolable adducts of the Lewis acidic redox-inactive metal ions (Mn+). Comprehensive data from single-crystal X-ray diffraction analysis reveal distinctive trends in the structural properties of the heterobimetallic species, including an uncommon dependence of the Pd center dot center dot center dot M distance on Lewis acidity. The reorganization energy associated with reduction of the heterobimetallic species is strongly modulated by Lewis acidity, with the slowest heterogeneous electron transfer kinetics associated with the strongest incorporated Lewis acids. This hitherto unexplored reorganization energy penalty for electron transfer contrasts with prior thermodynamic studies, revealing that kinetic parameters should be considered in studies of reactivity involving heterobimetallic species.
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