Premium
Triheterometallic Lanthanide Complexes Prepared from Kinetically Inert Lanthanide Building Blocks
Author(s) -
Sørensen Thomas Just,
Tropiano Manuel,
Kenwright Alan M.,
Faulkner Stephen
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201700027
Subject(s) - lanthanide , chemistry , terbium , intramolecular force , europium , chromophore , molecule , luminescence , steric effects , photochemistry , inert , crystallography , combinatorial chemistry , stereochemistry , organic chemistry , ion , physics , optoelectronics
Three molecular structures, each containing three different lanthanide(III) centres, have been prepared by coupling three kinetically inert lanthanide(III) complexes in an Ugi reaction. These 2 kDa molecules were purified by dialysis and characterised by NMR and luminescence techniques. The photophysical properties of these heterotrimetallic complexes were investigated and are discussed by comparison with simpler, but related, heterodimetallic compounds. It was found that an aminonaphthalene unit inhibits the sensitisation of terbium, and that the spatial arrangement of the chromophores and lanthanide(III) centres in these molecules inhibits the efficient sensitisation of europium. We conclude that the intramolecular collisions required for efficient Dexter energy transfer from the sensitiser to the lanthanide(III) centre can be prevented by steric congestion.