RAMAN STUDIES OF BIS(PHENYLTERPYRAZINE)IRON(II) AND SUPRAMOLECULAR SPECIES WITH PENTACYANIDOFERRATE(II) IONS

The chemistry and spectroscopy of the iron(II) phenylterpyrazine complex, [Fe(phtpz)2]2+, were investigated in comparison with the analogous phenylterpyridine species, Fe(phtpy)2]2+, and the results indicated a strong electronic delocalization on the Fe(II) terimine chromophore encompassing the late...

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Bibliographic Details
Published in:Química Nova 2019-01, Vol.42 (9), p.1020-1028
Main Authors: Mangoni, Ana, Brandão, Bruno, Shinohara, Jorge, Silveira, Alceu, Nakamura, Marcelo, Toma, Henrique
Format: Article
Language:English
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
iron terimines
iron terpyrazines
pentacyanidoferrates
Prussian Blue
Resonance Raman
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Summary:The chemistry and spectroscopy of the iron(II) phenylterpyrazine complex, [Fe(phtpz)2]2+, were investigated in comparison with the analogous phenylterpyridine species, Fe(phtpy)2]2+, and the results indicated a strong electronic delocalization on the Fe(II) terimine chromophore encompassing the lateral pyrazyl groups. The delocalized nature of the molecular orbitals involved in the electronic excitation precluded a direct assignment of the pyridine and pyrazine vibrations in the complex. However, the capability of the terpyrazine complex to bind transition metal ions, such as the [Fe(CN)5]3- species, allowed to generate pentanuclear complexes displaying characteristic charge-transfer and resonance Raman spectra, revealing the pyrazine vibrations in the complex. The [Fe(CN)5]3- containing species also yielded polymeric compounds in presence of transition metal ions, exhibiting intervalence transfer bands and chemical similarities with the Prussian Blue complex.
ISSN:0100-4042
1678-7064
1678-7064
DOI:10.21577/0100-4042.20170415