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Contents Vol 68(9)

Investigation of the Photophysical Properties of a Eu3+ Coordination Polymer Bearing an α-Nitrile Substituted β-Diketonate Ligand via Emission and Ultrafast Transient Absorption Spectroscopy

Brodie L. Reid A , Evan G. Moore B D , Brian W. Skelton C , Mark I. Ogden A D and Massimiliano Massi A D
+ Author Affiliations
- Author Affiliations

A Department of Chemistry, and Nanochemistry Research Institute, Curtin University, Kent Street, Bentley, WA 6102, Australia.

B School of Chemistry and Molecular Biosciences, University of Queensland, St Lucia, Qld 4072, Australia.

C Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Crawley, WA 6009, Australia.

D Corresponding authors. Email: egmoore@uq.edu.au; m.ogden@curtin.edu.au; m.massi@curtin.edu.au

Australian Journal of Chemistry 68(9) 1392-1398 https://doi.org/10.1071/CH15253
Submitted: 7 May 2015  Accepted: 30 May 2015   Published: 4 August 2015

Abstract

Reaction of the β-diketone ligand, 2-cyano-1,3-phenyl-1,3-propandione (LH), with hydrated EuCl3 in the presence of 1,10-phenanthroline (Phen), results in the crystallisation of a one-dimensional Eu3+ coordination polymer of formulation [Eu(Phen)(L)3]∞, formed by coordination of the nitrile group of an O,O′-bound ligand to a neighbouring metal centre. An investigation of the metal-centred emission of the polymer, both in the solid state and solution, revealed red emission characterised by relatively long-lived excited state lifetimes and high intrinsic quantum yields. However, analysis of the overall quantum yield and sensitisation efficiency reveals that ultrafast processes in the ligand potentially inhibit Eu3+ sensitisation. Further investigations into these processes using transient absorption spectroscopy suggest that substitution at the α-C position may significantly decrease sensitisation via the antenna effect.


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