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Abstract
A novel parent amido complex of iridium(I), K[Ir(NH2)(PPEP*)] (3), coordinated with a dearomatized PNP-pincer-type phosphaalkene ligand (PPEP*) has been prepared by deprotonation with KHMDS from [Ir(NH2)(PPEP)] (2) having benzophospholanylmethyl and phosphaethenyl groups at the 2,6-positions of pyridine. Complex 3 has two base points at PPEP* and NH2 ligands and, thus, successively reacts with two molecules of CH3CN via heterolytic cleavage of the C–H bond. X-ray structural analysis of the product complex K[Ir(CH2CN)2(PPEP)] (5) reveals remarkable elongation of the P═C bond indicative of the occurrence of strong π-back-donation from iridium to PPEP.
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