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Near-IR luminescent lanthanide complexes with 1,8-diaminoanthraquinone-based chromophoric ligands

Stacey, Oliver J., Ward, Benjamin David, Amoroso, Angelo JAmes and Pope, Simon J. A. 2016. Near-IR luminescent lanthanide complexes with 1,8-diaminoanthraquinone-based chromophoric ligands. Dalton Transactions 45 (15) , pp. 6674-6681. 10.1039/C5DT04351D

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Abstract

Three new chromophoric anthraquinone-based multidentate ligands have been synthesised in a step-wise manner from 1,8-dichloroanthraquinone. The ligands each comprise two dipicolyl amine units and react with trivalent lanthanide ions to form monometallic complexes of the form [Ln(L)](OTf)3 as indicated by MS studies and elemental analyses. Supporting DFT studies show that the monometallic species are highly favoured (>1000 kJ mol−1) over the formation of a 2 : 2 dimetallic congener. Both ligands and complexes absorb light efficiently (ε ∼ 104 M−1 cm−1) in the visible part of the spectrum, with λabs ca. 535–550 nm through an intramolecular charge transfer (ICT) transition localised on the substituted anthraquinone unit. In all cases the complexes show a fluorescence band at ca. 675 nm due to the ICT emitting state. The corresponding Nd(III), Yb(III) and Er(III) complexes also reveal sensitised near-IR emission characteristic of each ion following excitation of the ICT visible absorption band at 535 nm.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Chemistry
Subjects: Q Science > QD Chemistry
Publisher: Royal Society of Chemistry
ISSN: 1477-9226
Date of First Compliant Deposit: 18 December 2018
Date of Acceptance: 9 March 2016
Last Modified: 18 Dec 2018 11:37
URI: http://orca.cf.ac.uk/id/eprint/87889

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