Exploring the Effect of Ligand Structural Isomerism in Langmuir-Blodgett Films of Chiral Luminescent Eu III Self-Assemblies

Galanti, Agostino; Kotova, Oxana; Blasco, Salvador; Johnson, Chloë Jane; Peacock, Robert D.; Mills, Shaun; Boland, John J.; Albrecht, Martin; Gunnlaugsson, Thorfinnur (2016). Exploring the Effect of Ligand Structural Isomerism in Langmuir-Blodgett Films of Chiral Luminescent Eu III Self-Assemblies. Chemistry - a European journal, 22(28), pp. 9709-9723. Wiley-VCH 10.1002/chem.201600560

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Here we have investigated the influence of the antenna group position on both the formation of chiral amphiphilic EuIII-based self-assemblies in CH3CN 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 CH3CN 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 EuIII 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Johnson, Chloë Jane and Albrecht, Martin

Subjects:

500 Science > 540 Chemistry

ISSN:

0947-6539

Publisher:

Wiley-VCH

Language:

English

Submitter:

Eik Szee Goh Aschauer

Date Deposited:

24 Jan 2017 11:23

Last Modified:

24 Jan 2017 11:23

Publisher DOI:

10.1002/chem.201600560

PubMed ID:

27258206

BORIS DOI:

10.7892/boris.93812

URI:

https://boris.unibe.ch/id/eprint/93812

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