Luminescent Pt(II) complexes using unsymmetrical Bis(2-pyridylimino)isoindolate analogues

Payce, Ellie N., Knighton, Richard C., Platts, James A. ORCID: https://orcid.org/0000-0002-1008-6595, Horton, Peter N., Coles, Simon J. and Pope, Simon J. A. ORCID: https://orcid.org/0000-0001-9110-9711 2024. Luminescent Pt(II) complexes using unsymmetrical Bis(2-pyridylimino)isoindolate analogues. Inorganic Chemistry 63 (18) , 8273–8285. 10.1021/acs.inorgchem.4c00558

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Abstract

A series of ligands based upon a 1,3-diimino-isoindoline framework have been synthesized and investigated as pincer-type (N∧N∧N) chelates for Pt(II). The synthetic route allows different combinations of heterocyclic moieties (including pyridyl, thiazole, and isoquinoline) to yield new unsymmetrical ligands. Pt(L1–6)Cl complexes were obtained and characterized using a range of spectroscopic and analytical techniques: 1H and 13C NMR, IR, UV–vis and luminescence spectroscopies, elemental analyses, high-resolution mass spectrometry, electrochemistry, and one example via X-ray crystallography which showed a distorted square planar environment at Pt(II). Cyclic voltammetry on the complexes showed one irreversible oxidation between +0.75 and +1 V (attributed to Pt2+/3+ couple) and a number of ligand-based reductions; in four complexes, two fully reversible reductions were noted between −1.4 and −1.9 V. Photophysical studies showed that Pt(L1–6)Cl absorbs efficiently in the visible region through a combination of ligand-based bands and metal-to-ligand charge-transfer features at 400–550 nm, with assignments supported by DFT calculations. Excitation at 500 nm led to luminescence (studied in both solutions and solid state) in all cases with different combinations of the heterocyclic donors providing tuning of the emission wavelength around 550–678 nm.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	American Chemical Society
ISSN:	0020-1669
Funders:	EPSRC and Leverhulme Trust
Date of First Compliant Deposit:	3 May 2024
Date of Acceptance:	11 April 2024
Last Modified:	08 May 2024 10:45
URI:	https://orca.cardiff.ac.uk/id/eprint/168708

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