Synthesis and characterisation of thiophene-functionalised lanthanoid diketonate clusters with solvent-modulated europium luminescence

Andrews, Philip C.;Deacon, Glen B.;Gee, William J.;Junk, Peter C.;Urbatsch, Aron

Abstract

The reaction of a thiophene-containing ligand, (Z)-3-hydroxy-3-phenyl-1-(thiophen-2-yl)prop-2-en-1-one (Hhtp), with hydrated lanthanoid chloride salts has resulted in the isolation of two tetranuclear clusters, [Ln4(μ3-OH)2{(μ-O)-κ2-htp}2{(μ-O)2-κ2-htp}2(κ2-htp)6] [Ln = Nd (1), Eu (2)] and an erbium pentanuclear cluster, [Er5(μ3-OH)4(μ4-OH){(μ-O)-κ2-htp}4(κ2-htp)6] (3). The clusters have been characterised by elemental analysis, mass spectrometry, infrared spectroscopy and X-ray single-crystal structural determination. The luminescent properties of cluster 2 have been assessed, and, at 25 °C, quenching of luminescent emission was found to predominantly occur. However, incremental addition of selected coordinating solvents was found to promote luminescence at 25 °C, showing a linear relationship at low analyte concentrations

Journal

European Journal of Inorganic Chemistry

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2012

ISBN/ISSN

1099-0682

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Wiley-VCH

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DOI

10.1002/ejic.201200105