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Reversible Mutarotation in a Macrocyclic Ytterbium Complex
Author(s) -
Ballistreri Francesco P.,
Gentile Salvatore,
Pappalardo Andrea,
Tomaselli Gaetano A.,
Pradhan Sanghamitra,
Di Bari Lorenzo
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201002447
Subject(s) - ytterbium , helicity , circular dichroism , lanthanide , chemistry , crystallography , vibrational circular dichroism , stereochemistry , physics , optics , organic chemistry , ion , laser , particle physics
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 be started again, as in a sandclock, allowing one to envisage applications as a time‐marker chiral switch.