Redox Switching of Quadratic Nonlinearities

The first demonstration of redox switching of NLO responses was reported in 1999 by Coe et al. on ruthenium ammine complexes of 

METAL-BASED QUADRATIC NONLINEAR OPTICAL MATERIALS 

Dipolar compounds containing ferrocene units as the electron donor have been very popular in nonlinear optics (Section 1.3), and the reversible redox ferrocene/ferrocenium couple has logically been used to switch the hyperpolarisability Complex 94, containing an 

An interesting redox switching of quadratic nonlinearities has been achieved on the open-shell donor-acceptor dyad 95. Such a compound is composed of two electroactive units linked by an CH=CH bridge, the acceptor unit being the polychlorinated triphenyl (PTM) radical and the 

The same organometallic fragment has been used to prepare the bimetallic Fe -Fe° 97, and the resulting Fe -Fe 97+ and Fe -Fe 97 + complexes readily obtained by step-wise, one-electron oxidation 

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