Soret band, recording

The first detailed research on the mechanism of electron phototransfer with the participation of MP in vitreous matrices appears to be ref. 55, which deals with the processes of charge separation in vitreous solutions of zinc and magnesium porphyrins in ethanol containing some addition of CC14 at 77 K. Illumination of the solutions in the Soret band or in long-wave bands of MP absorption results in a one-quantum ionization of MP and formation of MPf cation radicals and CC14 anion radicals recorded according to their characteristic EPR and optical spectra [56,57]... 

The electronic spectrum of Fe(OMC) in chloroform has been recorded in the presence of several anions. No variation has been observed upon addition of non-coordinating anions such as hexafluorophosphate or tetrafluoborate, while the addition of chloride causes a marked increase in the intensity of the Soret band (370 nm). 

The rather high extinction coefficients recorded for the Soret bands of the diprotonated forms of rubyrins 7.25 and 7.26 are consistent with the idea that these systems are planar or near planar in solution. In the case of the bis-HCl salt of rubyrin 7.25, this proposed planarity was confirmed in the solid state via single crystal X-ray structural analysis. Specifically, this analysis revealed a planar macro-cyclic framework (Figure 7.1.2) wherein the only deviations from planarity arise, presumably, as the result of unfavorable methyl-methyl steric interactions at the P-positions of the bipyrrolic subunits. ... 

For the SWCNTs-ZnP construct, the recorded ICPE spectrum resembled the UV-vis spectmm of the corresponding ZnP. A maximum of 12 % in the IPCE spectmm was observed in the Soret band wavelength region of the ZnP at the 430 nm. 

Whatever the method of electropolymerization used, the UV-visible absorption spectra (recorded directiy from optically transparent ITO electrodes used to perform the electropolymerizalion) exhibit a broadened Soret band whose maximum is redshifted as compared to the starting ZnOEP species. Similarly, Q bands were also redshifted and broadened, i hese two observations have been attributed to the electron-withdrawing effect of viologens on the macrocycles in the polymers and to an increased deformation of the porphyrin ring as a function of the number of substitutions [113, 138, 141]. Moreover, the redshift and broadening of the absorption bands could also be attributed to the infra- and intermolecular interactions between the porphyrin subunits in the polymers [135, 138, 141]. 

Hemiporphycene, like the porphyrins, may be considered as being elaborated [18]annulenes. Such a formulation is consistent with the available data. For instance, the UV-vis absorption spectrum of 3.152, recorded in CH2CI2, reveals a rather strong Soret-like absorbance band at 405 nm, as well as four Q-type transitions at 512, 552,... 

The UV-visible spectrum of the complex at —45°C is shown in Fig. 38. It is obviously not contaminated by proflavine. Since the binding of camphor has no measurable effect on the Soret and visible bands of the oxygenated compound, the recording of the optical spec-... 

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