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Toward the Rational Design of Lanthanide Coordination Polymers:  a New Topological Approach

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journal contribution
posted on 06.08.2007, 00:00 by Claire Marchal, Yaroslav Filinchuk, Daniel Imbert, Jean-Claude G. Bünzli, Marinella Mazzanti
The implementation of four bidentate building blocks into a high-denticity linker with a flexible spacer leads to a predisposed ligand that allows one to direct the self-assembly of 1D functional coordination polymers. This is illustrated by the assembly under mild conditions of the luminescent metal−organic framework [Tb(Htpabn)]·14H2O (1; H4tpabn = N,N,N‘,N‘-tetrakis[(6-carboxypyridin-2-yl)methyl]butylenediamine). The X-ray crystal structure shows that the monoprotonated Htpabn binds two equivalent lanthanide ions to form a one-directional staircase chain. The high ligand denticity prevents solvent coordination and leads to a high luminescence quantum yield (Q = 39%), which is maintained after solvent removal.