Journal
DALTON TRANSACTIONS
Volume 51, Issue 43, Pages 16479-16485Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2dt02627a
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Funding
- University of Camerino
- University of Geneva [200020-184843]
- Swiss National Science Foundation [200020-184843]
- Uni Pisa [PRA 2020_21]
- European Commission Research Executive Agency [859752 HEL4CHIROLED H2020-MSCA-ITN-2019]
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This research successfully synthesized a series of chiral amide-based bis-pyridine substituted polyether macrocycles through a simple two-step synthesis protocol, with one ligand showing efficient complexation with terbium(iii) ions, leading to interesting chiroptical properties observed in absorbance and fluorescence.
A straightforward two-step synthesis protocol affords a series of chiral amide-based bis-pyridine substituted polyether macrocycles. One ligand is particularly able to complex terbium(iii) ions spontaneously. Upon complexation, interesting chiroptical properties are observed both in absorbance (ECD) and in fluorescence (CPL). In ligand-centered electronic circular dichroism, a sign inversion coupled with a signal enhancement is measured; while an easily detectable metal-centered circularly polarized luminescence with a g(lum) of 0.05 is obtained for the main D-5(4) -> F-7(5) terbium transition. The coordination mode and structure of the complex was studied using different analysis methods (NMR analysis, spectrophotometric titration and solid-state elucidation).
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