Enhancement of the Luminescence Properties of Eu (III) Containing Paramagnetic Saponite Clays

Stefano Marchesi,Chiara Bisio,Fabio Carniato

doi:10.3390/app11198903

Stefano Marchesi, Chiara Bisio + Show 1 more

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https://doi.org/10.3390/app11198903

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Abstract

In this study, 1,10-phenanthroline molecules were introduced in the interlayer space of a paramagnetic synthetic saponite clay containing both Eu3+ and Gd3+ ions in structural positions. Two samples with different loading of phenanthroline dye were prepared. The resulting hybrid materials possessed improved optical emission properties due to an efficient antenna effect from the phenanthroline to the Eu3+ centers; this effect was demonstrated to be higher than the metal-to-metal Gd3+-Eu3+ energy transfer previously studied. Insights on the relaxometric properties in aqueous solution of the solids after incorporation of the antenna groups were also obtained through NMR relaxometric analyses.

Highlights

In this work we investigated the enhancement of the luminescence of the Eu3+ centres in the Na–GdEuSAP layered material, recently reported by our research group [45], with the use of an antenna group (1,10-phenanthroline, Phen), which was introduced in the interlayer space of the bifunctional synthetic saponite at two different loadings, with respect to the cation exchange capacity (C.E.C.) of the clay
Two hybrid materials were prepared through intercalation of 1,10-pheThis indicates that the relaxometric properties remain almost unchanged after introduction nanthroline molecules in a bifunctional optical/paramagnetic saponite clay containing
The phenanthroline was introduced in the interlayer space of the saponite at two different loadings

Summary

Introduction

Enhancement of the Following the definition of the International Union of Pure and Applied Chemistry (IUPAC), lanthanides are a unique series of 15 chemical elements with metallic properties, ranging from lanthanum (atomic number 57) to lutetium (71) [1,2] They are historically known as rare-earth elements (REEs) along with the chemically similar scandium and yttrium elements [1]. The generic electron configuration for Ln3+ ions is [Xe]4f 0–14 , in which the electrons of 4f orbitals are shielded from the external environment by outer-core 5s2 5p6 sub-shells, which gives rise to a very abundant amount of electronic levels with well-defined energies [3] This effect gives the lanthanides some very fascinating features, such as paramagnetic, luminescent and catalytic properties [6,7,8]

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