Jean-Claude Bunzli - Characterization and photophysical properties of lanthanide macrocyclic complexes derived from (2,1)

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      Wang,M.Z., Jin,L.P., Bunzli,J.C.G. Polyhedron  1999 18 (13) 1853-1861

      Abstract: The isolation and characterization of   Ln(NO3)(3) complexes (Ln=La, Pr, Nd, Eu, Tb, Lu) with   2,3-benzo-1,4,7,13-tetraoxa-10-azacyclopenta-decane (L-1) and two   of its N-substituted derivatives (L-2, L-3) are reported.   Structural information in the solid state is derived from   spectroscopic data (vibrational, absorption, reflectance and   luminescence spectra). Both ligand- and metal-centered   luminescence of solutions of the complexes in oxygen-free and   anhydrous acetonitrile are investigated. Substitution of the   N-proton of the crown ether enhances metal emission. Ligand L-2   displays a good antenna effect for Eu-III luminescence, while L-3   is especially effective in transferring energy from its triplet   state onto the excited states of Tb-III. The Eu-III site in   Eu(NO3)(3)L-2. 0.5C(2)H(5)OH . 1.5H(2)O possesses a low local   symmetry and a relatively long D-5(0) lifetime (1.01 ms). (C)   1999 Elsevier Science Ltd. All rights reserved

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