Issue 33, 2023

The curious cases of tetrahydrosalen-type ligands interacting with Ni(ii): structures and ligand-based oxidation reactions

Abstract

This work centers around the nickel complexes derived from two tetrahydrosalen-type proligands: N,N′-bis(2-hydroxybenzyl)-o-phenylenediamine (H2salophan) and N,N′-bis(2-hydroxy-3-methylbenzyl)-o-phenylenediamine (H2salophan_Me). The reaction of H2salophan with Ni(OAc)2·4H2O generates a dinuclear complex Ni2(Hsalophan)2(OAc)2 or Na[Ni2(salophan)2(OAc)] when NaOH is added to assist ligand deprotonation. The reaction of H2salophan_Me with Ni(OAc)2·4H2O, however, yields a mononuclear complex Ni(Hsalophan_Me)2. Unlike the corresponding salen-type nickel complexes, these tetrahydrosalen-type complexes are paramagentic and air sensitive (in solution). Oxidation by O2 or peroxides results in dehydrogenation of the ligand backbone to form the salen-type complexes.

Graphical abstract: The curious cases of tetrahydrosalen-type ligands interacting with Ni(ii): structures and ligand-based oxidation reactions

Supplementary files

Article information

Article type
Paper
Submitted
28 Jun 2023
Accepted
31 Jul 2023
First published
01 Aug 2023

Dalton Trans., 2023,52, 11543-11551

Author version available

The curious cases of tetrahydrosalen-type ligands interacting with Ni(II): structures and ligand-based oxidation reactions

V. Xu, B. Pandey, J. P. I. D. Jayawardhena, J. A. Krause and H. Guan, Dalton Trans., 2023, 52, 11543 DOI: 10.1039/D3DT02023A

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