Hetero-bimetallic 2D coordination network constructed by azacrown ether carboxylic acid with lanthanide(III) and sodium ions |
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Affiliation: | 1. Univ. Brest, UMR-CNRS 6521 CEMCA, Brest, France;2. Department of Physical Chemistry, University of Debrecen, Debrecen, Hungary;3. Universidade da Coruña, Centro de Investigacións Científicas Avanzadas (CICA) and Departamento de Química, Facultade de Ciencias, A Coruña, Galicia, Spain |
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Abstract: | Two lanthanide-based coordination polymers Na3La(L)Cl·(H2O)6]·NO3 (La-L) and Na3Eu(L)Cl·(H2O)6]·NO3 (Eu-L) were newly synthesized by reaction of an azacrown ether carboxylic acid ligand H4L (4,7,13,16-tetracarboxymethyl-1,10-dioxa-4,7,13,16-tetraazacyclooctadecane) with La(III)/Eu(III). Complexes La-L and Eu-L exhibited two-dimensional (2D) coordination architectures built up by Ln–L coordinating subunits and one-dimensional (1D) Na–O bridging chains. Four versatile coordination modes of carboxyl groups and Na–O coordination bi-chains linked by novel μ-O bridges (μ2-O and μ3-O) were demonstrated in the structure. Photoluminescence spectra of Eu-L were investigated to reveal characteristic emissions of Eu(III). This is the first example of hetero-bimetallic complex of the tetraazacrown ether ligand with lanthanide and sodium ions. |
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