Conjugated optical constants

M. Pope and C. E. Swenberg. Electronic Processes in Organic Crystals and Polymers. Oxford University Press, 2nd edition, 1999. C. M. Ramsdale and N. C. Greenham. Ellipsometric determination of anisotropic optical constants in electroluminescent conjugated polymers. Adv. Mater., 14(3) 212, 2002. 

Winfield, J.M., Donley, C.L., Kim, J.S. Anisotropic optical constants of electroluminescent conjugated polymer thin films determined by variable-angle spectroscopic eUipsometry. J. Appl. Phys. 102(6), 06305 (2007)... 

Azo-bridged ferrocene oligomers also show a marked dependence on the redox potentials and IT-band characteristics of the solvent, as is usual for class II mixed valence complexes 21,22). As for the conjugated ferrocene dimers, 2 and 241 the effects of solvents on the electron-exchange rates were analyzed on the basis of the Marcus-Hush theory, in which the t/max of the IT band depends on (l/Dop — 1 /Ds), where Dop and Ds are the solvent s optical and static dielectric constants, respectively (155-157). However, a detailed analysis of the solvent effect on z/max of the IT band of the azo-bridged ferrocene oligomers, 252,64+, and 642+, indicates that the i/max shift is dependent not only on the parameters in the Marcus-Hush theory but also on the nature of the solvent as donor or acceptor (92). 

Three experimental methods that are capable of determining dissociation constants with a precision of the order of tenths of 1% have been most commonly used. Each of these methods—the cell potential method (2), the conductance method (3), and the optical method (4)—provides data that can be treated approximately, assuming that the solutions obey Henry s law, or more exactly on the basis of the methods developed in Chapter 19. We will apply the more exact procedures. As the optical method can be used only if the acid and conjugate base show substantial differences in absorption of visible or ultraviolet light, or differences in raman scattering or with the use of indicators, we shall limit our discussion to the two electrical methods. 

Chiral Metal Atoms in Optically Active Organo-Transition-Metal Compounds, 18, 151 13C NMR Chemical Shifts and Coupling Constants of Organometallic Compounds, 12, 135 Compounds Derived from Alkynes and Carbonyl Complexes of Cobalt, 12, 323 Conjugate Addition of Grignard Reagents to Aromatic Systems, I, 221 Coordination of Unsaturated Molecules to Transition Metals, 14, 33 Cyclobutadiene Metal Complexes, 4, 95 Cyclopentadienyl Metal Compounds, 2, 365... 

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