Abstract
The synthesis, crystal structures and luminescence of a novel family of lanthanide polymer complexes with general formula [Ln2(Hmidp)3(H2O)3](ClO4)3·6H2O (Ln=Nd, Sm, Eu, Gd, Dy, Ho, Tm; H2midp=N-methyliminodipropionic acid) are reported. The compounds were obtained by direct reaction of H2midp and lanthanide(III) perchlorate in aqueous solution. The choice of the conditions of synthesis were selected from speciation studies. The structure of the polymer complexes contains bimetallic cationic units [Ln2(Hmidp)3(H2O)3]3+ in which one of the Ln ions is eight-coordinated and the other nine-coordinated, linked by carboxylate bridges. This is expanded to a 2D network through carboxylate linkers. The solid state luminescence of the Eu complex was observed and an average lifetime value of 0.5ms was verified for the red emitting 5D0 excited state.
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