Absorption anisotropy and emission anisotropy measurements in poly(vinyl) alcohol (PVA) films of different porphyrin derivatives are reported. Wavelength dependent absorption anisotropy in oriented PVA films, and wavelength dependent excitation spectrum of emission anisotropy of fluorescent porphyrin derivatives in isotropic PVA films indicate the presence of multiple transition moments with different well-defined orientation. Comparison of linear dichroism and orientation behavior in stretched PVA films of deuteroporphyrin III (C(2V) symmetry) and its iron derivative reveals significant out-of-plane transition moment components. A considerable participation of out-of-plane polarized absorption components is also observed for metal derivatives of non-symmetrical protoporphyrin IX. It appears that central metal substitutions in porphyrin rings do not produce 'circular' degeneration of electronic transition moments. Instead, the presence of metal induces absorption components orthogonal to the porphyrin plane.

Gryczynski, Z., Paolesse, R., Smith, K.m., Bucci, E. (1997). Effect of central metal substitution on linear dichroism of porphyrins: Evidence of out-of-plane transition moments. BIOPHYSICAL CHEMISTRY, 69(1), 71-84 [10.1016/S0301-4622(97)00077-X].

Effect of central metal substitution on linear dichroism of porphyrins: Evidence of out-of-plane transition moments

PAOLESSE, ROBERTO;
1997-01-01

Abstract

Absorption anisotropy and emission anisotropy measurements in poly(vinyl) alcohol (PVA) films of different porphyrin derivatives are reported. Wavelength dependent absorption anisotropy in oriented PVA films, and wavelength dependent excitation spectrum of emission anisotropy of fluorescent porphyrin derivatives in isotropic PVA films indicate the presence of multiple transition moments with different well-defined orientation. Comparison of linear dichroism and orientation behavior in stretched PVA films of deuteroporphyrin III (C(2V) symmetry) and its iron derivative reveals significant out-of-plane transition moment components. A considerable participation of out-of-plane polarized absorption components is also observed for metal derivatives of non-symmetrical protoporphyrin IX. It appears that central metal substitutions in porphyrin rings do not produce 'circular' degeneration of electronic transition moments. Instead, the presence of metal induces absorption components orthogonal to the porphyrin plane.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/07 - Fondamenti Chimici delle Tecnologie
English
Con Impact Factor ISI
metal; polyvinyl alcohol; porphyrin; porphyrin derivative; protoporphyrin; absorption; absorption spectroscopy; anisotropy; article; biophysics; controlled study; linear dichroism; measurement; nonhuman; priority journal; Anisotropy; Fluorescence Polarization; Magnesium; Photosensitizing Agents; Porphyrins; Protoporphyrins; Spectrum Analysis; Zinc
Gryczynski, Z., Paolesse, R., Smith, K.m., Bucci, E. (1997). Effect of central metal substitution on linear dichroism of porphyrins: Evidence of out-of-plane transition moments. BIOPHYSICAL CHEMISTRY, 69(1), 71-84 [10.1016/S0301-4622(97)00077-X].
Gryczynski, Z; Paolesse, R; Smith, Km; Bucci, E
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/53581
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