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Alkyl chain functionalised, cyclometalated platinum(II) complexes: syntheses, luminescence properties and X-ray crystal structure

Lowe, Juliette A., Stacey, Oliver J., Horton, Peter N., Coles, Simon and Pope, Simon J. A. 2016. Alkyl chain functionalised, cyclometalated platinum(II) complexes: syntheses, luminescence properties and X-ray crystal structure. Journal of Organometallic Chemistry 805 , pp. 87-93. 10.1016/j.jorganchem.2016.01.015

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Abstract

The synthesis and characterisation of nine new monometallic heteroleptic platinum complexes [PtCl(L1−3)(DMSO)], [Pt(L1−3)(acac)], [Pt(L1−3)(8-Q)] (where L1−3 = N-octyl/dodecyl/hexadecyl-2-phenylquinoline-4-carboxamides; acac = acetylacetonate; 8-Q = 8-quinolinato) are described. Single crystal X-ray diffraction studies on [Pt(L1)(acac)] revealed a square planar coordination geometry with intermolecular Pt-Pt contacts at ca. 3.3 Å. The complexes were investigated using 195Pt{1H} NMR spectroscopy, revealing varied chemical shifts around δPt -2800 ppm that were strongly dependent upon the specific coordination environment of Pt(II). Luminescence studies showed the complexes possess a phosphorescent character with tuneable emission wavelengths between 605-641 nm, and luminescent lifetimes up to ca. 450. ns. Supporting TD-DFT studies provided descriptions of the HOMO and LUMO energy levels of the key complex types, which generally correlated well with the experimental spectra. The contribution of the Pt(5d) centre to the calculated HOMOs was strongly ligand dependent, whilst the LUMOs were generally predicted to be localized over the quinoline component of the cyclometalated ligand.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Elsevier
ISSN: 0022-328X
Date of Acceptance: 12 January 2016
Last Modified: 04 Jun 2017 08:47
URI: http://orca.cf.ac.uk/id/eprint/85092

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