Issue 3, 2024

Tuning the visible colour of octahedral manganese(iii) phthalocyanines via axial ligand exchange

Abstract

A series of [PcMnL2]SbF6 complexes (Pc = phthalocyanine) was synthesized and structurally characterized by stripping the chloride from PcMnCl with AgSbF6 in o-dichlorobenzene and adding a range of donor ligands (L = THF, pyridine, p-dimethylaminopyridine (DMAP), Ph3PO, N-methylimidazole (MeIm), MeCN) to the resulting solution. Addition of or exposure to water where L = heterocyclic amines yielded μ-oxo complexes of the form [PcMnL]2O, which were structurally characterized for L = DMAP and MeIm. The [PcMnL2]SbF6 complexes have an increased solubility in organic solvents, where the axial ligands inhibit the characteristic ring π−π aggregation of PcM complexes. A variety of colours were observed (blue/green to red/purple), with Q-band absorptions (excluding the μ-oxo species) spanning from 715–761 nm and LMCT-bands from 497–574 nm. The combination of the ligand-induced absorption shifts coupled with their relative intensities in the visible region is responsible for the observed colour range and illustrates that facile ligand exchange is a useful tool in producing materials with a variety of colours from PcMnCl.

Graphical abstract: Tuning the visible colour of octahedral manganese(iii) phthalocyanines via axial ligand exchange

Supplementary files

Article information

Article type
Paper
Submitted
22 Oct 2023
Accepted
04 Dec 2023
First published
18 Dec 2023

Dalton Trans., 2024,53, 938-948

Tuning the visible colour of octahedral manganese(III) phthalocyanines via axial ligand exchange

D. McKearney, K. MacDonald, M. S. Kim, V. E. Williams and D. B. Leznoff, Dalton Trans., 2024, 53, 938 DOI: 10.1039/D3DT03518B

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