Exploring the Effect of Ligand Structural Isomerism in Langmuir-Blodgett Films of Chiral Luminescent Eu(III) Self-Assemblies.
Here we have investigated the influence of the antenna group position on both the formation of chiral amphiphilic Eu(III) -based self-assemblies in CH3 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 CH3 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, EuL2 and EuL3 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 EuL3 (≈85 %) with the minor species present in ≈15 % EuL2 .
School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
Agostino
A
Galanti
School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland. kotovao@tcd.ie.
Oxana
http://orcid.org/0000-0002-7682-540X
O
Kotova
School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland.
Salvador
S
Blasco
School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland.
Chloe J
CJ
Johnson
School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, Scotland, UK.
Robert D
RD
Peacock
Centre for Research on Adaptive, Nanostructures and Nanodevices (CRANN) and School of Chemistry, University of Dublin, Trinity College Dublin, Dublin 2, Ireland.
Shaun
S
Mills
Centre for Research on Adaptive, Nanostructures and Nanodevices (CRANN) and School of Chemistry, University of Dublin, Trinity College Dublin, Dublin 2, Ireland.
John J
JJ
Boland
School of Chemistry and Chemical Biology, University College Dublin, Belfield, Dublin 4, Ireland.
Martin
M
Albrecht
School of Chemistry and Trinity Biomedical Sciences Institute (TBSI), Trinity College Dublin, The University of Dublin, Dublin 2, Ireland. gunnlaut@tcd.ie.
Thorfinnur
http://orcid.org/0000-0003-4814-6853
T
Gunnlaugsson
Langmuir-Blodgett films; europium; lanthanides; luminescence; self-assembly