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Effect of pyrazine loading on catalyst speciation when methanol-d4 solutions of [IrCl(COD)(h22-2)] are examine with d9-BnND2 and pyrazine in the presence of p-H2 seen through the hydride region of the corresponding 1H NMR spectra. Left, thermally equilibrated NMR spectra and right, initial SABRE-enhanced NMR spectra. Species A and B are defined in the text while C is Ir(H)2(Cl)(d9-BnND2)(pz)(h22-2) and D [Ir(H)2(d9-BnND2)(methanol-d4)(h22-2)]Cl.
