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Inorganic Chemistry, Vol.52, No.9, 5611-5619, 2013
2,2'-Pyridylpyrrolide Ligand Redistribution Following Reduction
The potential redox activity of the 2,2'-pyridylpyrrolide ligand carrying two CF3 substituents (L-2) is investigated. Synthesis and characterization of d(6) and d(7) species M(L-2)(2) for M = Fe and Co are described (both are nonplanar, but not tetrahedral), as are the Lewis acidity of each. In spite of CV evidence for quasireversible reductions to form M(L-2)(2)(q-) where q = 1 and 2, chemical reductants instead yield divalent metal complexes KM(L-2)(3), which show attractive interactions of K+ to pyrrolide, to F, and to lattice toluene pi cloud. The collected evidence on these products indicates that pyridylpyrrolide is a weak field ligand here, but CO can force spin pairing in Fe(L-2)(2)(CO)(2). Evidence is presented that the overall reductive reaction yields 33 mol % of bulk metal, which is the fate of the reducing equivalents, and a mechanism for this ligand redistribution is proposed. Analogous ligand redistribution behavior is also seen for nickel and for trimeric monovalent copper analogues; reduction of Cu(L-2)(2) simply forms Cu(L-2)(2)(-).