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Hammett plots of (a) log(krel) versus σ(−) for ligand 6 (■), krel = 1.235σ(−), R2 = 0.9259; (b) log(krel) vs σ(−) for ligand 6 (■), krel = 1.635σ(−), R2 = 0.9531; (c) log(krel) vs σ(−) for ligand 7 (●), krel = 1.264σ, R2 = 0.9387; (d) log(krel) vs σ for ligand 7 (●), krel = 1.657σ, R2 = 0.9468.
