Nickel(II) carbonyl, ammonia, and acetonitrile complexes supported by a pyridine dipyrrolide pincer ligand

The synthesis, isolation and crystal structures of nickel(II) carbonyl, acetonitrile and ammonia complexes supported by a dianionic, pyridine dipyrrolide pincer ligand [pyrr2py]2 − , namely, carbonyl[2,2 ′ -(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido- κ N)]nickel(II), [Ni(C41H33N3)(CO)], ammine[2,2 ′ -(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido- κ N)]nickel(II), [Ni(C41H33N3)(NH3)], and (acetonitrile- κ N)[2,2 ′ -(pyridine-2,6-diyl)bis(3,5-di-p-tolylpyrrolido- κ N)]nickel(II), [Ni(C41H33N3)(CH3CN)], as well as the free ligand 2,6-bis(3,5-di-p-tolylpyrrol-2-yl)pyridine, C41H35N3 or [pyrr2py]H2 are reported. The nickel complexes are four-coordinate and adopt a square-planar geometry. The CO stretch of the nickel-bound carbon monoxide ligand of [pyrr2py]Ni(CO) has been observed at 2101   cm − 1. The ammonia and acetonitrile complexes, [pyrr2py]Ni(NH3) and [pyrr2py]Ni(NCMe) feature all-nitrogen coordination spheres around nickel consisting of different N-donor ligand types.

Source: Acta Crystallographica Section E - October 9, 2020 Category: Chemistry Authors: Dias, H.V.R. Pramanik, A. Tags: crystal structure nickel pincer ligand N-donors carbon monoxide research communications Source Type: research