Unsymmetrical nickel (PCN) pincer complexes with a benzothiazole side-arm: Synthesis, characterization and electrochemical properties

[Display omitted] •A benzothiazole (PCN) pincer ligand has been designed and synthesized in good yields.•The NiII complexes (PCN)NiBr and (PCN)NiF show a peculiar electrochemical behavior.•“Green” complex activation through external currents is a promising perspective. The newly prepared unsymmetric...

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Published in:Inorganica Chimica Acta 2021-03, Vol.517, p.120182, Article 120182
Main Authors: Luconi, Lapo, Tuci, Giulia, Gafurov, Zufar N., Mercuri, Giorgio, Kagilev, Alexey A., Pettinari, Claudio, Morozov, Vladimir I., Yakhvarov, Dmitry G., Rossin, Andrea, Giambastiani, Giuliano
Format: Article
Language:English
Subjects:
Anodizing
Crystals
Electrochemical analysis
Electrochemistry
EPR spectroscopy
Ligands
Nickel
NMR spectroscopy
Oxidation
Single crystals
Thiazole ligands
Toluene
Transition metal halides
Unsymmetrical pincer complexes
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Summary:[Display omitted] •A benzothiazole (PCN) pincer ligand has been designed and synthesized in good yields.•The NiII complexes (PCN)NiBr and (PCN)NiF show a peculiar electrochemical behavior.•“Green” complex activation through external currents is a promising perspective. The newly prepared unsymmetrical pincer ligand with a benzothiazole side-arm 2-(3-((di-tert-butylphosphino)methyl)phenoxy)benzo[d]thiazole [BzTz(H)PCN] has been reacted with anhydrous NiBr2 to get the corresponding NiII square planar bromo complex (BzTzPCN)NiBr (1) after HBr elimination and CH activation on the pincer central phenyl ring. Starting from 1, reaction with AgF in toluene or with AgBF4 in THF led to bromide abstraction and formation of the fluoro complex (BzTzPCN)NiF (2) and the ionic aquo species [(BzTzPCN)Ni(H2O)]BF4 (3), respectively. All species have been characterized in solution (multinuclear 1H, 13C{1H}, 31P{1H} and 11B NMR spectroscopy) and in the solid state (single-crystal X-ray diffraction analysis). Finally, comparative electrochemical measurements (CV and in situ EPR-spectroelectrochemistry) carried out on the halide complexes 1 and 2 revealed that the anodic oxidation process leads to the formation of stable NiIII species bearing a coordinated bromide ligand in case of 1 and a fluoride-free complex in case of 2.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2020.120182