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This facile interconversion of dinuclear double helicates and side-by-side species: a reprogrammable ligand with potential sensor applications

Bokolinis, G., Riis-Johannessen, T., Harding, Lindsay P., Jeffery, John C., McLay, N. and Rice, Craig R. (2006) This facile interconversion of dinuclear double helicates and side-by-side species: a reprogrammable ligand with potential sensor applications. Chemical Communications. pp. 1980-1982. ISSN 1364-548X

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    Abstract

    The ligand L1 forms a dinuclear double helicate with Cu+ but upon addition of Ba2+ to the system a side-by-side species is formed both in solution and in the solid state; in the presence of Na+ both the helicate and the side-by-side species are formed in roughly equal amounts in solution.

    Item Type: Article
    Subjects: Q Science > QD Chemistry
    Schools: School of Applied Sciences
    School of Applied Sciences > Materials and Catalysis Research Centre
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    References:

    1 J.-M. Lehn, Supramolecular Chemistry, VCH, Weinheim, 1995;
    J. W. Steed and J. L. Atwood, Supramolecular Chemistry, John Wiley
    and Sons, Chichester, 2000; M. J. Hannon and L. J. Childs, Supramol.
    Chem., 2004, 16, 7; M. Albrecht, Chem. Rev., 2001, 101, 3547;
    M. Albrecht, Chem. Soc. Rev., 1998, 27, 281; C. Piguet,
    G. Bernardinelli and G. Hopfgartner, Chem. Rev., 1997, 97, 2005;
    E. C. Constable, in Comprehensive Supramolecular Chemistry, vol. 9;
    Polynuclear Transition Metal Helicates, ed J.-P. Sauvage, Elsevier,
    Oxford, 1996, pp. 213.
    2 C. J. Baylies, L. P. Harding, J. C. Jeffery, T. Riis-Johannessen and
    C. R. Rice, Angew. Chem., Int. Ed., 2004, 43, 4515.
    3 C. J. Baylies, T. Riis-Johannessen, L. P. Harding, J. C. Jeffery, R. Moon,
    C. R. Rice and M. Whitehead, Angew. Chem., Int. Ed., 2005, 44, 6909.
    4 C. J. Baylies, J. C. Jeffery, T. A. Miller, T. Riis-Johannessen and
    C. R. Rice, Chem. Commun., 2005, 4158.
    5 The absorbance occurs ,350 nm, well within the ligand absorption
    region. Addition of either Na+ or Ba2+ metal ions to 1 results in a decrease
    in the absorption intensity in this region with the effect greatest for Ba2+.
    The dark red colour observed is presumably due to MLCT to the p*
    orbital of the planar bipyridine, which is usual for a Cu(I) system
    coordinated by bipyridine ligand. Upon reprogramming of the ligand
    strand the torsion angle of the bipyridine unit increases to 82u; with the
    bipyridine unit no longer planar and acting as a mono-dentate ligand the
    MLCT is quenched.
    1982 | Chem. Commun., 2006, 1980–1982 This journal is The Royal Society of Chemistry 2006

    Depositing User: Briony Heyhoe
    Date Deposited: 13 Jul 2007
    Last Modified: 09 Sep 2010 11:39
    URI: http://eprints.hud.ac.uk/id/eprint/261

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