[PDF]    http://dx.doi.org/10.3952/lithjphys.47204

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 47, 123–128 (2007)


METAL STATE ALTERATION IN Fe PHTHALOCYANINE
A. Amulevičius, V. Remeikis, and A. Undzėnas
Institute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: antanas@ar.fi.lt

Received 28 February 2007; revised 10 May 2007

57Fe isotope-enriched iron phthalocyanine has been synthesized and studied by the Mössbauer spectroscopy in the temperature range 100–350 K. The intermediate Fe oxidation states have been observed and it has been found that the rate of charge redistribution is temperature-dependent. The correlation between the temperature behaviour of the isomeric shift and quadrupole splitting has been demonstrated. The Fe oxidation states are associated with fluctuations of electron charges, electron-accepting and electron-donating properties of surrounding ligands. The energy barriers separating Fe oxidation states have been determined.
Keywords: Mössbauer spectroscopy, isomeric shift, quadrupole splitting, iron phthalocyanine, Fe oxidation states
PACS: 33.45.+x, 34.50.Gb, 32.10.Fn


METALO BŪSENOS KAITA Fe FTALOCIANINE
A. Amulevičius, V. Remeikis, A. Undzėnas
Fizikos institutas, Vilnius, Lietuva

Susintetintas 57Fe izotopu praturtintas geležies ftalocianinas ir tirtas Mesbauerio spektroskopijos metodu 100–350 K temperatūros intervale. Buvo stebimos tarpinės Fe oksidacijos būsenos ir nustatyta, kad krūvio persiskirstymo sparta priklauso nuo temperatūros. Parodytas sąryšis tarp izomerinio poslinkio temperatūrinės elgsenos ir kvadrupolinio suskilimo. Fe oksidacijos laipsnis siejamas su elektrono krūvio fliuktuacijomis bei ligandų gebėjimu priimti ir atiduoti elektronus. Įvertinti Fe oksidacijos būsenas skiriantys energijos barjerai.


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