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Binuclear complexes of Ni(i) from 4-terphenyldithiophenol
Binuclear complexes of Ni(i) have been prepared from a 4-terphenyldithiophenol ligand. Steric effects were found to determine the formation of coordination isomeric structures that differ in the nature of metal-to-ligand bonding. Coordination of spatially demanding phosphine ligands PR3, R = C6H6, C6H11, at nickel sites results in a butterfly shaped thiolate-bridged Ni2(mu-S)2 motif. For smaller PMe3, the central pi-system of the 4-terphenyl backbone adopts a bis-allyl like mu-syn-eta3:eta3-C6H4 structure due to significant d-pi? Ni(i)-to-ligand charge transfer. Delocalisation indices delta(Ni-Ni) derived from DFT calculations provide a metric to assess the strength of electronic coupling of the Ni sites based on solid state structural data, and indicated less strong electronic coupling for the bis-allyl like structure with delta(Ni-Ni) = 0.225 as compared to 0.548 for the Ni2(mu-S)2 structural motif. A qualitative reactivity study toward CNCH3 as an auxiliary ligand has provided the first insight into the chemical properties of the bimetallic complexes presented.
Note that a catalyst decreases the activation energy for both the forward and the reverse reactions and hence accelerates both the forward and the reverse reactions.name: Bis(tri-tert-butylphosphine)palladium, you can also check out more blogs about53199-31-8
Reference£º
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method