10 November 2003 Quadratic nonlinear optical properties of transition metal quaterpyridyl complexes
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A series of 2,2':4,4'':4',4'''-quaterpyridinium ligands bearing different N-substituents (methyl, Me; phenyl, Ph; 4-acetylphenyl, AcPh; 2-pyrimidyl, Pym; 3,5-bis-methoxycarbonyl-phenyl, MCP) have been prepared. These compounds feature powerful electron acceptor moieties and hence have been combined with different electron-rich metal centres to give complexes suitable for quadratic nonlinear optical properties. A series of dipolar ruthenium(II) ammine complex salts of the form [RuII(NH3)4LA][PF6]4 and octupolar complex salts of the form [MII(LA)3][PF6]8 (M = Ru(II)/Fe(II), LA = a 2,2':4,4'':4',4'''-quaterpyridinium ligand) have been prepared. These compounds exhibit multiple intense, low energy metal-to-ligand charge-transfer (MLCT) absorptions in the visible region and reversible M(III/II) redox processes. First hyperpolarizabilities have been determined directly by using hyper-Rayleigh scattering and indirectly via calculation from Stark (electroabsorption) spectroscopic data.
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James A. Harris, James A. Harris, Benjamin J. Coe, Benjamin J. Coe, Lathe A. Jones, Lathe A. Jones, Bruce S. Brunschwig, Bruce S. Brunschwig, Inge Asselberghs, Inge Asselberghs, Koen J. Clays, Koen J. Clays, Andre P. Persoons, Andre P. Persoons, } "Quadratic nonlinear optical properties of transition metal quaterpyridyl complexes", Proc. SPIE 5212, Linear and Nonlinear Optics of Organic Materials III, (10 November 2003); doi: 10.1117/12.507853; https://doi.org/10.1117/12.507853

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