Exploring the Effect of Ligand Structural Isomerism in Langmuir–Blodgett Films of Chiral Luminescent EuIII Self‐Assemblies. Issue 28 (3rd June 2016)

• Record Type: Journal Article
• Authors: Galanti, Agostino; Kotova, Oxana; Blasco, Salvador; Johnson, Chloe J.; Peacock, Robert D.; Mills, Shaun; Boland, John J.; Albrecht, Martin; Gunnlaugsson, Thorfinnur
• Is Part Of: Chemistry. Volume 22:Issue 28(2016)
• Page Start: 9709
• Page End: 9723
• Publication Date: 2016-06-03
• Subjects: europium -- Langmuir–Blodgett films -- lanthanides -- luminescence -- self-assembly; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201600560
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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 forEuL, EuL2 andEuL3 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 of1( R ) and1( 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 fromEuL3 (≈85 %) with the minor species present in ≈15 %EuL2 . Abstract : Chiral monolayers : The study of a series of chiral ligand derivatives of 2, 6‐pyridinedicarboxylic acid, with ( R )‐ or ( S )‐1‐(2‐naphthyl)‐ethylamine antenna, investigated the influence the antenna group position has 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 (see figure).