Enhancing luminescence properties of lanthanide(III)/pyrimidine-4,6-dicarboxylato system by solvent-free approach

Dalton Transactions : an International Journal of Inorganic Chemistry
Javier CepedaAntonio Luque

Abstract

The solvent-free melt reactions between lanthanide(iii) nitrates and pyrimidine-4,6-dicarboxylic acid (H2pmdc) led to three-dimensional (3D) coordination polymers with formula [Ln(μ4-pmdc)(NO3)(H2O)]n () [Ln(iii) = La, Ce, Pr, Nd, Sm, and Eu] and {[Ln(μ4-pmdc)(NO3)(H2O)]·H2O}n () [Ln(iii) = Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu]. The crystal structure of compounds is built up from the junction of centrosymmetric Ln(iii)-pmdc dimers, where pmdc ligand adopts an unusual μ4-κ(2)N,O:κ(2)N',O':κ(2)O,O'':κO''' coordination mode, rendering a metal coordination number of 10. The smaller ionic radii of the second half of the series prevents the latter coordination mode in , giving rise to a framework based on triangular shaped motifs. A common structural feature is the coordination of the nitrate anion as terminal chelating ligand which limits the presence of a unique coordination water molecule. Magnetic properties have been analysed for all compounds, through the variable temperature susceptibility and field dependent magnetization. Photoluminescence measurements were performed at different temperatures and excitation wavelengths upon Sm(3+), Eu(3+), Tb(3+), and Dy(3+) containing compounds which exhibit strong characteristic emissions in...Continue Reading

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Citations

May 28, 2016·Dalton Transactions : an International Journal of Inorganic Chemistry·Itziar OyarzabalEnrique Colacio
Jun 20, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Oier Pajuelo-CorralJavier Cepeda
Aug 29, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Ana Belén Ruiz-MuelleIgnacio Fernández
Nov 10, 2017·Inorganic Chemistry·Antonio A García-ValdiviaAntonio Rodríguez-Diéguez

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