Jean-Claude Bunzli - ****- and heterodinuclear self-assembled pseudo-cylindrical lanthanide complexes as building blocks for organized luminescent materials

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  Publication Details (including relevant citation   information):

  Piguet,C., Bunzli,J.C.G. European Journal of Solid State and   Inorganic Chemistry 1996 33 (2-3)   165-174

  Abstract: The ligands   2,6-bis(1'-alkyl-benzimidazol-2'-yl)pyridines (L(i), i=1-6) react   with Ln(3+) in acetonitrile to give the three successive   complexes [Ln(L(i))](3+), [Ln(L(i))(2)](3+) and   [Ln(L(i))(3)](3+). As a result of efficient L(i)(3 pi   pi*)-->Ln(III) energy transfers, the 1:1 complexes   [Ln(L(i))](3+) are strongly luminescent and act as UV-->vis   light converting devices for Ln=Eu, Tb. In [Ln(L(i))(3)](3+), the   three ligands are wrapped around Ln(3+) leading to pseudo-D-3,   cylindrical building blocks where the metal ion is well protected   from external interactions. The helical arrangement of the three   strands produces closely packed structures displaying efficient   radiationless leading to low quantum yields for   [EU(L(i))(3)](3+). However, the resulting steric interstrand   interactions give promising size discriminating effects and these   pseudo-cylindrical lanthanide building blocks have been   introduced into more sophisticated architectures such as   self-assembled dinuclear triple-helical complexes   [Ln(2)(L(7))(3)](6+) and heterodinuclear d-f complexes   [LnM(L(9))(3)](3+) where M stands for a divalent transition   metal. The photophysical properties together with the detailed   self-assembly processes leading to the dinuclear complexes are   discussed