In this paper we report the spectral manifestation of existence two spectral forms of Pd-porphin in wide set of Shpol'skii
matrices at cryogenic temperatures. The short-wavelength spectral form is attributed to the structure, where the central
Pd(II) ion is in plane of the porphyrin macrocycle, while the long-wavelength form is associated with the nonplanar
saddle-type conformation of the PdP. The frequencies of the normal vibrations in the ground electronic state have been
measured separately for both forms and the differences in the normal modes of two macrocycle conformations are
discussed. The type of molecule distortion has been established with using information about the frequencies of vibronic
modes from high-resolved spectra of metalloporphins. Matrix effect was shown to have significant role in the stabilization of each of two conformations.
In this paper we report the spectral manifestation of different spectral forms obtained for Mg-, Zn-, Pd- and Pt-porphins
in solid matrices (Shpol'skii matrices, solid tetrahydrofuran and rare gas matrices) at cryogenic temperatures. The planar
and two kinds of distorted conformations of Mg-, Zn-porphins in highly-resolved fluorescence spectra have been
detected. For Zn-porphin distorted forms have been detected in the fluorescence and phosphorescence spectra
simultaneously. In the phosphorescence spectra of the Pd- and Pt-porphins the manifestation of the two forms in the
ground state has been proved also. Energy splitting in the phosphorescence spectrum of the Pd-porphin in n-octane at 4,2
K comes to 78 cm-1 for two forms of the Pd-porphin. Under selective excitation in S0-S1 channel the large set of sharp lines was detected for each of two forms and vibrational frequencies have been determined. In highly-resolved
phosphorescence spectra of Pt-porphin in n-octane at 4,2 K we have detected similar manifestation of the two spectral
forms in the phosphorescence spectrum. To estimate the type of molecule distortion the information about the
frequencies of vibronic modes from well-resolved spectra of metalloporphins have been used.
In this work we report the spectroscopic observation of single organic molecules in solid-deposited matrices using a confocal microscope at liquid-helium temperature. The fluorescence microscopy allowed to study the spectroscopic properties of many single molecules in parallel Matrix isolation technique was adopted to produce a solid samples directly on the objective surface. From sequential images recorded at different excitation laser frequency the spectral line-widths of corresponding zero-phonon absorption lines could be obtained. For investigated compounds of interest at different matrices the line-widths have been measured. Spectral stability of single molecules has been investigated under excitation.
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