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Fine tuning and switching the electronic properties of ferrocene chromophores has been an area of considerable significance and a plethora of new ferrocene-based chromophores with new properties are continually being reported in the current literature. Depending upon the oxidation state of the iron metal center and/or on the chemical constitution, the ferrocene unit in its chromophore behaves as an...
Novel, push–pull chromophores combining a cationic benzothiazolium acceptor moiety and either one or two thiophene rings as a part of the conjugated π-system between the donor and the acceptor moieties have been synthesized and characterized. The chromophores displayed pronounced quadratic NLO activity with their first molecular hyper polarizabilities in agreement with their linear spectral properties.
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