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Efficient, Reversible Redox‐Switching of Molecular First Hyperpolarizabilities in Ruthenium( II ) Complexes Possessing Large Quadratic Optical Nonlinearities
Author(s) -
Coe Benjamin J.,
Houbrechts Stephan,
Asselberghs Inge,
Persoons André
Publication year - 1999
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19990201)38:3<366::aid-anie366>3.0.co;2-d
Subject(s) - ruthenium , chemistry , photochemistry , redox , nonlinear optical , metal , nonlinear optics , molecule , ligand (biochemistry) , inorganic chemistry , nonlinear system , organic chemistry , physics , receptor , quantum mechanics , catalysis , biochemistry
Low‐energy metal‐to‐ligand charge‐transfer (MLCT) excitations are associated with the very large molecular nonlinear optical (NLO) coefficients, β , of the complexes [Ru II (NH 3 ) 5 ( N ‐R‐4,4′‐bipyridinium)] 3+ (R=methyl, phenyl, or 4‐acetylphenyl). Chemical oxidation to the Ru III forms causes bleaching of the MLCT absorptions and marked attenuation of the NLO responses. Both effects are completely reversed upon re‐reduction, and the extent of the β switching is about 10‐ to 20‐fold.