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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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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: 28 Aug 2021 23:33


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