Synthesis and Characterization of ONO Pincer Ligand Precursors and Metal Complexes with Ethyl, Isopropyl and Tert-Butyl Wingtip Groups

Synthesis and Characterization of ONO Pincer Ligand Precursors and Metal Complexes with Ethyl, Isopropyl and Tert-Butyl Wingtip Groups

We have synthesized novel cobalt(II) and nickel(II) pincer ligand complexes containing novel tridentate ligand precursors that coordinate via oxygen, nitrogen, and oxygen donor atoms. The novel tridentate ONO ligands, which are neutral, incorporate a carbonyl-substituted imidazole functionality and...

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Bibliographic Details
Main Authors: John R. Miecznikowski, Olivier J. C. Nicaise, Brandon Q. Mercado, Abigail J. Araujo, Natalia R. Bertolotti, Samantha L. Erickson, Joseph P. Trucchio, Michael J. Corbett, Connor J. Padover, Stephanie L. Coulombe, Audrey J. Wheeler, Isaac P. Ouellette
Format: Article
Language:English
Published: MDPI AG 2025-02-01
Series:Crystals
Subjects:
pincer complexes
tridentate ligands
ONO donor atoms
cobalt(II) complexes
nickel(II) complexes
Online Access:https://www.mdpi.com/2073-4352/15/3/227
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Summary:We have synthesized novel cobalt(II) and nickel(II) pincer ligand complexes containing novel tridentate ligand precursors that coordinate via oxygen, nitrogen, and oxygen donor atoms. The novel tridentate ONO ligands, which are neutral, incorporate a carbonyl-substituted imidazole functionality and contain R groups of ethyl, isopropyl, or tert-butyl. The ligand precursors were thoroughly characterized using NMR spectroscopy, ESI-MS, and IR spectroscopy. The metal complexes were thoroughly characterized using single crystal X-ray diffraction, elemental analysis, ESI-MS, and cyclic voltammetry. The nickel(II) and cobalt(II) complexes with ethyl, isopropyl, and t-butyl wingtip groups had a pseudo-octahedral geometry about the metal center. The nickel(II) complex with R = isopropyl had a monoclinic lattice with C121 space group (a = 21.7639(8); b = 11.0649(5); c = 10.9225(4); alpha = 90.0 degrees; beta = 90.609(3) degrees; gamma = 90.0 degrees). The cobalt(II) complex with R = ethyl had a monoclinic lattice with P2<sub>1</sub>/n space group (a = 17.7907(7); b = 21.5278(6); c = 21.8597(7); alpha = 90.0 degrees; beta = 95.063(3) degrees; gamma = 90.0 degrees). The cobalt(II) complexes were paramagnetic with μ<sub>eff</sub> = 1.59 BM (R = ethyl) and 6.67 BM (R = t-butyl). The nickel(II) complex was paramagnetic with μ<sub>eff</sub> = 2.59 BM. The ligand precursors and metal complexes are redox-active.
ISSN:2073-4352

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