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Cover Picture: The First Self‐Assembled Trimetallic Lanthanide Helicates Driven by Positive Cooperativity (Chem. Eur. J. 8/2003)
Author(s) -
Floquet Sébastien,
Ouali Nadjet,
Bocquet Bernard,
Bernardinelli Gérald,
Imbert Daniel,
Bünzli JeanClaude G.,
Hopfgartner Gérard,
Piguet Claude
Publication year - 2003
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200390196
Subject(s) - lanthanide , cooperativity , crystallography , cover (algebra) , chemistry , ligand (biochemistry) , luminescence , paramagnetism , self assembly , supramolecular chemistry , metal , materials science , crystal structure , physics , condensed matter physics , organic chemistry , ion , receptor , optoelectronics , mechanical engineering , biochemistry , engineering
The cover picture shows the emergence of the first self‐assembled trimetallic lanthanide helicate in which positive cooperativity overcomes strong intermetallic electrostatic repulsions occurring between the metals. The D 3 symmetry of the final edifice provides two different metallic sites that are insensitive to the relative orientation of the ligand strands. This unique feature offers novel perspectives for the rational programming of magnetic and optical properties in polymetallic lanthanide complexes. An investigation on the influence of the fine tuning of crystal‐field parameters on multicentre paramagnetic NMR spectra and luminescence is reported by C. Piguet et al. on p. 1860 ff.