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Exploring the Effect of Ligand Structural Isomerism in Langmuir–Blodgett Films of Chiral Luminescent Eu III Self‐Assemblies
Author(s) -
Galanti Agostino,
Kotova Oxana,
Blasco Salvador,
Johnson Chloe J.,
Peacock Robert D.,
Mills Shaun,
Boland John J.,
Albrecht Martin,
Gunnlaugsson Thorfinnur
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201600560
Subject(s) - langmuir–blodgett film , luminescence , ligand (biochemistry) , materials science , langmuir , crystallography , chemistry , nanotechnology , optoelectronics , monolayer , receptor , biochemistry , aqueous solution
Here we have investigated the influence of the antenna group position on both the formation of chiral amphiphilic Eu III ‐based self‐assemblies in CH 3 CN solution and, on the ability to form monolayers on the surface of quartz substrates using the Langmuir–Blodgett technique, by changing from the 1‐naphthyl ( 2( R ) , 2( S ) ) to the 2‐naphthyl ( 1( R ) , 1( S ) ) position. The evaluation of binding constants of the self‐ assemblies in CH 3 CN solution was achieved using conventional techniques such as UV/Visible and luminescence spectroscopies along with more specific circular dichroism (CD) spectroscopy. The binding constants obtained for EuL , EuL 2 and EuL 3 species in the case of 2‐naphthyl derivatives were comparable to those obtained for 1‐naphthyl derivatives. The analysis of the changes in the CD spectra of 1( R ) and 1( S ) upon addition of Eu III not only allowed us to evaluate the values of the binding constants but the resulting recalculated spectra may also be used as fingerprints for assignment of the chiral self‐assembly species formed in solution. The obtained monolayers were predominantly formed from EuL 3 (≈85 %) with the minor species present in ≈15 % EuL 2 .