Abstract
The synthesis, isolation and crystal structures of nickel(II) carbonyl, aceto-nitrile and ammonia complexes supported by a dianionic, pyridine dipyrrolide pincer ligand [pyrr2py]2-, namely, carbonyl[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]-nickel(II), [Ni(C41H33N3)(CO)], ammine[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]nickel(II), [Ni(C41H33N3)(NH3)], and (aceto-nitrile-κN)[2,2'-(pyridine-2,6-di-yl)bis-(3,5-di-p-tolyl-pyrrolido-κN)]nickel(II), [Ni(C41H33N3)(CH3CN)], as well as the free ligand 2,6-bis-(3,5-di-p-tolyl-pyrrol-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 aceto-nitrile complexes, [pyrr2py]Ni(NH3) and [pyrr2py]Ni(NCMe) feature all-nitro-gen coordination spheres around nickel consisting of different N-donor ligand types.
Highlights
Pincer ligands were first introduced by Moulton and Shaw in 1976 (Moulton & Shaw, 1976)
Monoanionic, carbon-centered ligands with P- or N-donors at the flanking arms are more common among pincers (Peris & Crabtree, 2018)
This paper describes results from our efforts to expand the ligand repertoire to include tridentate ligands with a preference for meridional geometry (Adiraju et al, 2020) at transition-metal ions in our laboratory
Summary
Pincer ligands were first introduced by Moulton and Shaw in 1976 (Moulton & Shaw, 1976) They are utilized widely as auxiliary ligands to produce transition-metal complexes useful in a range of applications including catalysis (Alig et al, 2019; Peris & Crabtree, 2004, 2018; Piccirilli et al, 2020; Albrecht & van Koten, 2001). Monoanionic, carbon-centered (e.g., from phenyl) ligands with P- or N-donors at the flanking arms are more common among pincers (Peris & Crabtree, 2018). These tridentate ligands are interesting for their ability to preferentially occupy the meridional coordination sites on a metal ion.
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