The structural effect of methyl substituents in the pyrazole (pz) ligand of [(C5Me5)Ir(pz)3H] complexes is considerable. Whereas all three rings in 1 are equivalent and participate in intramolecular protropism, this is true for only two rings in 2. This is revealed, for example, in the larger basicity of the third pyrazole ring in 2.
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