Andrews, Philip C., Deacon, Glen B., Gee, William J., Junk, Peter C., and Urbatsch, Aron (2012) Synthesis and characterisation of thiophene-functionalised lanthanoid diketonate clusters with solvent-modulated europium luminescence. European Journal of Inorganic Chemistry, 2012 (20). pp. 3273-3282.

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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

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