Jean-Claude Bunzli - ****- and Heterodinuclear Helicates of Lanthanide(III), Zinc(II) and Aluminium(III) Based on 8-Hydroxyquinoline Ligands

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  Albrecht,M., Osetska,O., Bunzli,J.C.G., Gumy,F., Frohlich,R.   Chemistry-A European Journal 2009  15 (35) 8791-8799

  Abstract: Homonuclear helicates with   rare-earth-metal(III) ions or heteronuclear derivatives with   rare-earth-metal and aluminium or zinc centres are obtained in   alkali-metal-templated self-assembly processes from   isobutenylidene-bridged homoditopic   bis(2-carbamido-8-hydroxyquinoline)-derived ligands 1-H-2 and   2-H-2 or heteroditopic   (8-hydroxyquinoline)(2-carbamido-8-hydroxyquinoline)-derived   ligands 3-H-2 and 4-H-2. Diamagnetic coordination compounds   possess a high stability in organic solvents such as CDCl3,   [D-4]MeOH or [D-6]DMSO and can be well characterised by H-1 NMR   spectroscopy by using methylene protons and the protons of the   vinylic units of the ligand as stereochemical or symmetry probes,   respectively. Some of the homonuclear complexes could be   crystallised and were characterised by using X-ray diffraction   studies. The complexes adopt a triple-stranded helical structure   with a central templating cation encapsulated in their interior.   An unusual orientation of the double bond of one spacer towards   this cation is observed. The ****- and heterodinuclear helicates   with ytterbium(III), neodymium(III) or erbium(III) of ligands 2   and 4 were of special interest owing to their near-infrared (NIR)   emitting properties, which were investigated depending on the   lanthanide and on the encapsulated alkali-metal cation

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