BISCALIX[4]ARENE LIGANDS FOR DINUCLEAR LANTHANIDE ION COMPLEXATION

Citation
Mpo. Wolbers et al., BISCALIX[4]ARENE LIGANDS FOR DINUCLEAR LANTHANIDE ION COMPLEXATION, Liebigs Annalen, (12), 1997, pp. 2587-2600
Citations number
42
Language
INGLESE
art.tipo
Article
Journal title
ISSN journal
0947-3440
Issue
12
Year of publication
1997
Pages
2587 - 2600
Database
ISI
SICI code
0947-3440(1997):12<2587:BLFDLI>2.0.ZU;2-9
Abstract
Three types of lower-lower rim linked biscalix[4]arenes that contain c arboxylic ester (1) and/or amide functions (2 and 3) at their remainin g phenolic oxygen atoms were synthesized. The homo- and heterodinuclea r lanthanide ion complexes based on these ligands were used to study t he energy transfer between different lanthanide ions. Photophysical st udies comparing the luminescence properties of the homodinuclear Eu3complex and the heterodinuclear Eu3+-Nd3+ complex of 2 indicated that energy transfer is likely to occur from Eu3+ to Nd3+ with an efficienc y of > 50%. The luminescence properties turned out to be strongly solv ent dependent, which is attributed to structural changes leading to di fferent positions of the lanthanide ions in the cavities provided by t he biscalix[4]arene.