Biscalix[4]arene ligands for dinuclear lanthanide ion complexation


Oude Wolbers, Manon P. and Veggel, Frank C.J.M. van and Heeringa, Remco H.M. and Hofstraat, Johannes W. and Geurts, Frank A.J. and Hummel, Gerrit J. van and Harkema, Sybolt and Reinhoudt, David N. (1997) Biscalix[4]arene ligands for dinuclear lanthanide ion complexation. Liebigs Annalen/Recueil, 1997 (12). pp. 2587-2600. ISSN 0947-3440

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Abstract:Three types of lower-lower rim linked biscalix[4]arenes that contain carboxylic ester (1) and/or amide functions (2 and 3) at their remaining phenolic oxygen atoms were synthesized. The homo- and heterodinuclear lanthanide ion complexes based on these ligands were used to study the energy transfer between different lanthanide ions. Photophysical studies comparing the luminescence properties of the homodinuclear Eu3+ complex and the heterodinuclear Eu3+-Nd3+ complex of 2 indicated that energy transfer is likely to occur from Eu3+ to Nd3+ with an efficiency of > 50%. The luminescence properties turned out to be strongly solvent dependent, which is attributed to structural changes leading to different positions of the lanthanide ions in the cavities provided by the biscalix[4]arene.
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Copyright:© 1997 WILEY-VCH Verlag
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Metis ID: 105929