2010
DOI: 10.1002/chem.201002447
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Abstract: M40 is a four-fold symmetry macrocyclic ligand endowed with axial and central chiral elements, all of R configuration. It promptly binds late lanthanides (Yb(III) and Lu(III) ) yielding a negative helicity, as witnessed by NIR-electronic circular dichroism. In the course of a few hours, a new conformation of the complex takes over, which has opposite helicity and allows for a dynamic free-bound equilibrium. Upon slow solvent evaporation, the original conformation is retrieved and the whole dynamic process can … Show more

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Cited by 13 publications
(6 citation statements)
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“…2 Observation of a reversible mutarotation process NIR-CD spectroscopy is a useful chiroptical technique for exploring chirality aspects (structural features, dynamic processes, ligand exchanges) such as in ytterbium complexes where the lanthanide ion Yb 3+ is used as the NIR probe. For example, a new stereochemical behaviour was pointed out by Di Bari et al, 58 in a helicate-type macrocyclic ytterbium complex (named [Yb 2 (M40)] in Fig. 7a) which slowly inverts its helicity from a kinetic to a thermodynamic compound and goes back to the kinetic product upon slow solvent evaporation as evidenced by NIR-CD spectroscopy (Fig.…”
Section: E Chiral Transfer In Polyoxometalates (Poms)mentioning
confidence: 86%
“…2 Observation of a reversible mutarotation process NIR-CD spectroscopy is a useful chiroptical technique for exploring chirality aspects (structural features, dynamic processes, ligand exchanges) such as in ytterbium complexes where the lanthanide ion Yb 3+ is used as the NIR probe. For example, a new stereochemical behaviour was pointed out by Di Bari et al, 58 in a helicate-type macrocyclic ytterbium complex (named [Yb 2 (M40)] in Fig. 7a) which slowly inverts its helicity from a kinetic to a thermodynamic compound and goes back to the kinetic product upon slow solvent evaporation as evidenced by NIR-CD spectroscopy (Fig.…”
Section: E Chiral Transfer In Polyoxometalates (Poms)mentioning
confidence: 86%
“…Furthermore, the ligand may provide the necessary conditions to sensitize the ion's photo‐ (or electro‐) luminescence . In this context, salen‐type ligands ( N , N '‐bis(salicylidine)diamine) have shown promising properties especially in binding late lanthanides and promoting Near‐IR luminescence of Yb 3+ complexes …”
Section: Methodsmentioning
confidence: 99%
“…44). 73 The sign of the NIR-CD was significantly reversed after 18-24 h in CH 3 CN, indicating that its helical structure was inverted. Upon slow evaporation, the original conformation was retrieved.…”
Section: -3 Time-programmed Helicity Switchingmentioning
confidence: 98%