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Syntheses, X-ray structures and characterisation of luminescent chromium(III) complexes incorporating 8-quinolinato ligands

Syntheses, X-ray structures and characterisation of luminescent chromium(III) complexes incorporating 8-quinolinato ligands
Syntheses, X-ray structures and characterisation of luminescent chromium(III) complexes incorporating 8-quinolinato ligands
A series of six coordinate homoleptic and heteroleptic Cr(III) complexes have been formed that incorporate 8-quinolinato ligands. Three classes of complex have been synthesised and characterised: (i) [Cr(Q)3]; (ii) [Cr(Q)2(H2O)2]Cl; (iii) [Cr(Q)(N^N)2](PF6)2 (where Q is a ligand, 8-hydroxyquinoline, 8-hydroxy-2-methyl-quinoline, or 8-hydroxy-5-nitroquinoline; N^N = 1,10-phenanthroline or 2,2′-bipyridine). Single crystal X-ray structures were obtained for four complexes giving examples of [Cr(Q)2(H2O)2]Cl, two [Cr(Q)(bipy)2](PF6)2 and [Cr(Q)(phen)2](PF6)2. Each complex shows the ligands in the expected coordination mode with a distorted octahedral geometry evident at the metal centre. The UV–Vis. absorption data allowed assignments of the quinolinato-centred electronic transitions together with a much weaker spin allowed d–d transition (4A2 → 4T2) around 550 nm. Each complex was found to be luminescent in aerated MeCN solution at room temperature, which was attributed to a ligand-centred fluorescence based on the coordinated quinolinato ligand.
Chromium, Complex, Luminescence, Quinolate, Structures
0277-5387
396-405
Al-Riyahee, Ali A.A.
ef841918-c521-4fab-9a3b-ca00c0d896fb
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Amoroso, Angelo J.
36fe0d26-e00c-41b7-95cc-271c13df6f2d
Pope, Simon J.A.
db9a489c-29ba-41cd-a96a-623bace0889d
Al-Riyahee, Ali A.A.
ef841918-c521-4fab-9a3b-ca00c0d896fb
Horton, Peter N.
154c8930-bfc3-495b-ad4a-8a278d5da3a5
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Amoroso, Angelo J.
36fe0d26-e00c-41b7-95cc-271c13df6f2d
Pope, Simon J.A.
db9a489c-29ba-41cd-a96a-623bace0889d

Al-Riyahee, Ali A.A., Horton, Peter N., Coles, Simon J., Amoroso, Angelo J. and Pope, Simon J.A. (2019) Syntheses, X-ray structures and characterisation of luminescent chromium(III) complexes incorporating 8-quinolinato ligands. Polyhedron, 157, 396-405. (doi:10.1016/j.poly.2018.10.019).

Record type: Article

Abstract

A series of six coordinate homoleptic and heteroleptic Cr(III) complexes have been formed that incorporate 8-quinolinato ligands. Three classes of complex have been synthesised and characterised: (i) [Cr(Q)3]; (ii) [Cr(Q)2(H2O)2]Cl; (iii) [Cr(Q)(N^N)2](PF6)2 (where Q is a ligand, 8-hydroxyquinoline, 8-hydroxy-2-methyl-quinoline, or 8-hydroxy-5-nitroquinoline; N^N = 1,10-phenanthroline or 2,2′-bipyridine). Single crystal X-ray structures were obtained for four complexes giving examples of [Cr(Q)2(H2O)2]Cl, two [Cr(Q)(bipy)2](PF6)2 and [Cr(Q)(phen)2](PF6)2. Each complex shows the ligands in the expected coordination mode with a distorted octahedral geometry evident at the metal centre. The UV–Vis. absorption data allowed assignments of the quinolinato-centred electronic transitions together with a much weaker spin allowed d–d transition (4A2 → 4T2) around 550 nm. Each complex was found to be luminescent in aerated MeCN solution at room temperature, which was attributed to a ligand-centred fluorescence based on the coordinated quinolinato ligand.

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More information

Accepted/In Press date: 5 October 2018
e-pub ahead of print date: 15 October 2018
Published date: 1 January 2019
Keywords: Chromium, Complex, Luminescence, Quinolate, Structures

Identifiers

Local EPrints ID: 428995
URI: https://eprints.soton.ac.uk/id/eprint/428995
ISSN: 0277-5387
PURE UUID: 88bea9d6-b830-476f-aea4-8b8bdab4bfbf
ORCID for Peter N. Horton: ORCID iD orcid.org/0000-0001-8886-2016
ORCID for Simon J. Coles: ORCID iD orcid.org/0000-0001-8414-9272

Catalogue record

Date deposited: 15 Mar 2019 17:30
Last modified: 17 Sep 2019 01:03

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