Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5397968 | Journal of Luminescence | 2017 | 9 Pages |
Abstract
Two series of one dimensional coordination polymers, {Na[Ln(sal)4]}n (Ln=Eu, Tb, Er, Y) and {Na[Ln(msal)4]}n (Ln=Er) and a new series of trinuclear complexes Na[Ln2(nsal)7(CH3OH)2] (Ln=Pr, Eu, Er) have been synthesized, structurally characterized and their luminescence and decay dynamical properties studied. This in order to explore the potential of sal-type ligands to yield compounds with various dimensionalities and probe the impact of defect sites on their unique photoluminescence behaviour. The Eu3+ compounds, {Na[Eu(sal)4]}n and Na[Eu2(nsal)7(CH3OH)2] are bright red luminophores having Eu3+ (5D0) emission spectra dominated by the 5D0â7F2 transition. Eu3+ substitutional defects, possibly arising from the swapping of Na+ with Eu3+ ions and the replacement of sal- with methanol, are evident from luminescence and decay dynamical data on both complexes. Decay data also indicate that energy migration on the Eu3+ sub-lattice in one dimensional chains of {Na[Eu(sal)4]}n is multidimensional and dynamic but is less efficient than energy migration in Na[Eu2(nsal)7(CH3OH)2] which features a H-bonded network of trinuclear molecules. The results of this comparative exploration of structure and luminescence can be manipulated to direct dimensionality in crystal engineering of these compounds.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Marvadeen A. Singh-Wilmot, Rochette A. Sinclair, Ishenkumba A. Kahwa, Alan J. Lough,