Related Experiment Video
Updated: May 22, 2025
Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
Published on: April 14, 2020
Near Infrared-Circularly Polarized Luminescence/Circular Dichroism Active Yb(III) Complexes Bearing Both Central and
Silvia Ruggieri1, Oliver George Willis2, Silvia Mizzoni1
1Luminescent Materials Laboratory, DB, University of Verona, and INSTM, UdR Verona, Verona 37134, Italy.
Abstract:
In this contribution, we present new NIR-CPL/CD active Yb(III) complexes, which are synthesized by combining two ligands characterized by different types of chirality: central and axial chirality. The ligand bearing central chirality is represented by the neutral trans-N,N'-bis(2-pyridylmethylidene)-1,2-(R,R or S,S) cyclohexanediamine (L), whereas the axial ligand is 1,1'-binaphthyl-2,2'-diol (BINOL-H2). A combined 1H NMR, thermodynamic (spectrophotometric titrations), and theoretical (DFT structural calculations) study is presented, revealing the high stability in the methanol solution of the homochiral C-symmetric anionic [YbL(BINOL)2]- complexes, in which the two labile BINOLate molecules exhibit the same stereochemistry (R or S). The metal ion-related optical and chiroptical properties of the complexes in the near-infrared spectral region are here presented and discussed: while the axial chirality dominates the circularly polarized luminescence features, the NIR-CD signal is affected by both chiral elements.
More Related Videos
09:38Fabrication Procedures and Birefringence Measurements for Designing Magnetically Responsive Lanthanide Ion Chelating Phospholipid Assemblies
Published on: January 3, 2018
08:31Luminescence Resonance Energy Transfer to Study Conformational Changes in Membrane Proteins Expressed in Mammalian Cells
Published on: September 16, 2014
Related Concept Videos
02:52Stereoisomerism
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
02:30Chirality in Nature
02:24Properties of Enantiomers and Optical Activity
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
01:14Photoluminescence: Applications