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- W2040055280 abstract "Six new nonlinear optical (NLO) chromophores with pyrazinyl-pyridinium electron acceptors have been synthesized by complexing a known pro-ligand with electron donating {RuII(NH3)5}2+ or trans-{RuII(NH3)4(py)}2+ (py = pyridine) centers. These cationic complexes have been characterized as their PF6− salts by using various techniques including electronic absorption spectroscopy and cyclic voltammetry. The visible d → π* metal-to-ligand charge-transfer (MLCT) absorptions gain intensity on increasing the number of RuII centers from one to two, but remain at constant energy. One or two RuIII/II redox processes are observed which are reversible, quasi-reversible, or irreversible, while all of the ligand-based reductions are irreversible. Molecular first hyperpolarizabilities β have been determined by using hyper-Rayleigh scattering (HRS) at 1064 nm, and depolarization studies show that the NLO responses of the symmetric species are strongly two-dimensional (2D) in character, with dominant “off-diagonal” βzyy components. Stark (electroabsorption) spectroscopic measurements on the MLCT bands also allow the indirect determination of estimated static first hyperpolarizabilities β0. Both the HRS and the Stark-derived β0 values increase on moving from mono- to bimetallic complexes, and substantial enhancements in NLO response are achieved when compared with one-dimensional (1D) and 2D monometallic RuII ammine complexes reported previously." @default.
- W2040055280 created "2016-06-24" @default.
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- W2040055280 date "2010-10-20" @default.
- W2040055280 modified "2023-09-24" @default.
- W2040055280 title "Two-Dimensional, Pyrazine-Based Nonlinear Optical Chromophores with Ruthenium(II) Ammine Electron Donors" @default.
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- W2040055280 doi "https://doi.org/10.1021/ic1019197" @default.
- W2040055280 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20961137" @default.
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