Jean-Claude Bunzli - Towards materials with planned properties: Dinuclear f-f helicates and d-f non-covalent podates based on benzimidazole-pyridine binding units

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  Bunzli,J.C.G., Petoud,S., Piguet,C., Renaud,F. Journal of   Alloys and Compounds 1997 249  (1-2) 14-24

  Abstract: We have taken advantage of   self-assembly processes associated with the induced fit concept   to design multidentate segmental ligands based on substituted   benzimidazole-pyridine moieties which lead to the selective   formation of stable luminescent mononuclear lanthanide complexes,   dinuclear f-f helicates and non-covalent d-f lanthanide podates.   The influence of the various substituents on the stability and   quantum yield of the non-covalent edifices is discussed. It is   demonstrated that replacement of one benzimidazole moiety by a   carboxamide group enhances considerably the luminescent   properties of the supramolecular light-converting devices.   Moreover, the introduction of a non-covalent d-block tripod   (Zn-II, Fe-II) into the organic ligand increases the   thermodynamic stability and the selectivity of the complexation   process. The lanthanide podates containing a non-covalent Fe-II   tripod display a spin crossover behavior in the temperature range   300-360 K leading to new materials with tunable magnetic   properties. Finally, the multi-component self-assembly leading to   the heterodinuclear noncovalent d-f podates is discussed together   with the H-1 NMR characterization of intricate lanthanide   complexes

  Address (URL): WOS:A1997XC09200006

 

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