Transition-metal containing organic chromophores for functional nonlinear optics: enhancing and switching the second-order nonlinear optical respones

摘要

The optical properties of transition-metal containing organic chromophores, mostly metalorganic complexes, are strongly influenced by the electronic nature of the metal, the ligands, and the remaining organic moiety that together constitute the chromosphere. Intramolecular charge-transfer (ICT) from an electron-donor to an electron-acceptor gives rise to a CT absorption band in the UV-VIS-NIR part of the electromagnetic spectrum. Since metals can play the role of electron-donor- in a metal-to-ligand charge-transfer (MLCT) - or of electron-acceptor - in a ligand-to-metal charge-transfer (LMCT) - metalorganic complexes arc often highly colored.