Stacey, Oliver J., Ward, Benjamin David ![]() ![]() ![]() |
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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 |
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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: | 13 Nov 2023 10:15 |
URI: | https://orca.cardiff.ac.uk/id/eprint/87889 |
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