Ancillary ligand control of reactivity. Protonation at hydride vs. cyanide in trans-[FeH(CN)(R2PCH2CH2PR2)2](R = Et, Ph, p-tolyl) and X-ray crystal structure determination of trans-[FeH(CNH)(R2PCH2CH2PR2)2]BF4(R =p-tolyl)

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Abstract
The ancillary ligands in trans-[FeH(CN)L2] control whether protonation occurs at hydride to produce a dihydrogen complex or at cyanide to produce a hydrogen isocyanide complex.