Display options
Cite
Jensen TB, Scopelliti R, Bünzli JC. Lanthanide triple-stranded helicates: controlling the yield of the heterobimetallic species. Inorg Chem. 2006;45(19):7806-14doi: 10.1021/ic0608501.
Jensen, T. B., Scopelliti, R., & Bünzli, J. C. (2006). Lanthanide triple-stranded helicates: controlling the yield of the heterobimetallic species. Inorganic chemistry, 45(19), 7806-14. https://doi.org/10.1021/ic0608501
Jensen, Thomas B, et al. "Lanthanide triple-stranded helicates: controlling the yield of the heterobimetallic species." Inorganic chemistry vol. 45,19 (2006): 7806-14. doi: https://doi.org/10.1021/ic0608501
Jensen TB, Scopelliti R, Bünzli JC. Lanthanide triple-stranded helicates: controlling the yield of the heterobimetallic species. Inorg Chem. 2006 Sep 18;45(19):7806-14. doi: 10.1021/ic0608501. PMID: 16961372.
Copy Download .nbib Format: NLM
Share it on

Inorg Chem. 2006 Sep 18;45(19):7806-14. doi: 10.1021/ic0608501.

Lanthanide triple-stranded helicates: controlling the yield of the heterobimetallic species.

Inorganic chemistry

Thomas B Jensen, Rosario Scopelliti, Jean-Claude G Bünzli

Affiliations

  1. Laboratory of Lanthanide Supramolecular Chemistry, Ecole Polytechnique Fédérale de Lausanne, BCH 1402, CH-1015 Lausanne, Switzerland.

PMID: 16961372 DOI: 10.1021/ic0608501

Abstract

Two unsymmetrical ditopic hexadentate ligands designed for the simultaneous recognition of two different trivalent lanthanide ions have been synthesized, L(AB2) and L(AB3), where A represents a tridentate benzimidazole-pyridine-benzimidazole coordination unit, B2 a diethylamine-substituted benzimidazole-pyridine-carboxamide one, and B3 a chlorine-substituted benzimidazole-pyridine-carboxamide moiety. Under stoichiometric 2:3 (Ln/L) conditions, these ligands self-assemble with lanthanide ions to yield triple-stranded bimetallic helicates. The crystal structures of four helicates with L(AB3) of composition [LnLn'(L(AB3))3](ClO4)6.solv (CeCe, PrPr, PrLu, NdLu) show the metal ions embedded into a helical structure with a pitch of about 13.2-13.4 A. The metal ions lie at a distance of 9.1-9.2 A and are nine-coordinated by the three ligand strands, which are oriented in a HHH (head-head-head) fashion, where all ligand strands are oriented in the same direction. In the presence of a pair of different lanthanide ions in acetonitrile solution, the ligand L(AB3) shows selectivity and gives high yields of heterobimetallic complexes. L(AB2) displays less selectivity, and this is shown to be directly related to the tendency of this ligand to form high yields of HHT (head-head-tail) isomer. A fine-tuning of the HHH left arrow over right arrow HHT equilibrium and of the selectivity for heteropairs of Ln(III) ions is therefore at hand.

Publication Types