UV-visible NIR spectra

The radical anions 1, anti-2, anti,anti-3, and anti,anti,anti-4 were generated by the reduction of the corresponding ladder polysilanes with potassium (Scheme 8). When the ladder poly silanes were treated with potassium in tetrahydrofuran (THF) at ca. — 70 °C, the solutions were immediately colored 1, purple anti-2, brown anti,anti-3, blue and anti,anti,anti-4, black. In the UV-visible-NIR spectra, several absorption bands appeared (Fig. 15). The intense absorption of anti,anti-3 and anti,anti,anti-4 in the near-infrared region is noted because it has been... 

Fig. 15. UV-visible-NIR spectra of l -, anti-2 anti,anti-3, and anti,anti,anti-4 in THF...

Figure 16 UV-visible-NIR spectra (g values per Mo) for the Mo aqua ion [Mo304(H20)91 + ( ), the Mo111 aqua trimer (----------------) and the mixed valence trimer Mo l,nl,IV (-) in HPTS 4...

Figure 19 UV-visible-NIR spectra of [Mo4S4(H20)12]4+ (-) and [Mo4S4(H20)12]5+ (-) in 1M HPTS...

The UV/visible/NIR spectra of the electrochemically generated anions Ceo, , and have been reported and the... 

UV-Visible-NIR Spectra Dependence on Doping Level and Chain Conformation... 

As a consequence, there has been extensive recent interest in exploring means of modifying PAn chain conformations, using UV-visible-NIR spectra (and asso-... 

The UV-visible-NIR spectra, Mossbauer spectra, and magnetic susceptibility differ only slightly from those of oxidized and reduced rubredoxins. 

The UV/visible/NIR spectra of the electrochemically generated anions Cgo, Cgo, and Cgo have been reported and the transitions assigned on the basis of theoretical calculations. The ESR spectra of these ions (frozen solution) suggest singlet, triplet, and singlet magnetic ground states, respectively. There was no evidence for the quartet S = 3/2) state of Cgo . Pure Cgo and Cgg/Cyo mixtures have also been chemically... 

Similar marked changes in their UV-visible-NIR spectra occur for the recently discovered "soluble" PPys when the organic solvent is var-... 

These band structure calculations are in agreement with the observed UV-visible-NIR spectra of emeraldine salts, PAn. HA. In their "compact coil" conformation, emeraldine salts typically exhibit three peaks a ji-ji (band... 

Dependence of UV-visible-NIR spectra on chain conformation. In general, conjugated polymers such as polyaniline show a strong coupling between their electronic structure and geometric features such as the polymer chain conformation. A number of theoretical studies have examined the influence of polyaniline chain conformation, and, in particular, the role of phenyl and phenyl/quinoid torsional angles along the chain, on the electronic structure of PAn (and consequently their electronic absorption spectra). These include semi-empirical calculations by Br das et and by de Oliveira et al. ... 

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