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The synthesis of the bifunctional iminophosphorane-NHC (1) based on the imidazo[1,5-a]pyridin-3ylidene (IPy) platform is reported. Its imidazo[1,5-a]pyridinium salt precursor [1•H](X) was readily obtained by an efficient three-component coupling reaction between 5bromoimidazo[1,5-a]pyridinium bromide, sodium azide, and triphenylphosphine according to a SN Ar /Staudinger reaction sequence. The stable free carbene 1 was generated by deprotonation of [1•H](X) with potassium bis(trimethylsilyl)amide, and its coordination ability toward various transitionmetals was evaluated, either upon direct metalation of the free carbene or by transmetalation from a silver(I) NHC complex. While the ligand 1 is singly bounded through the carbene carbon atom in the latter complex, it behaves as a chelating bidentate ligand in all other complexes that were prepared, including the cationic and neutral palladium(II) complexes [Pd(allyl)(κ 2 C,N -1)](OTf) ([5](OTf)) and [PdCl 2 (κ 2 C,N -1)] (7), and the cationic rhodium(I) complexes [Rh(cod)(κ 2 C,N -1)](OTf) ([8](OTf)) and [Rh(CO) 2 (κ 2 C,N -1)](OTf) ([9](OTf)), generating stable 5-membered metallacycles. IR ν CO measurements carried out on the complex [Rh(CO) 2 (κ 2 C,N -1)](OTf) ([9](OTf)) show evidence of the strong donating character of the iminophosphorane-NHC ligand 1.

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