Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions

• Authors: L. Najder-Kozdrowska , B. Pilawa , E. Buszman , A. Więckowski , L. Świątkowska , D. Wrześniok , W. Wojtowicz
• Languages of publication: EN

Abstracts

EN

The mono- and biradical forms of DOPA-melanin (DOPA-eumelanin) were studied by EPR spectroscopy in 100-300 K temperature range. The existence of triplet states in DOPA-melanin was proved. The analysis of EPR spectra has shown that in DOPA-melanin and its complexes with kanamycin and Cu^{2+} ions, two kinds of paramagnetic centres exist. The first of them are in doublet ground state with spin S = 1/2 and they obey the Curie law. The paramagnetic centres of the second group are in thermally excited triplet state with spin S = 1 and in this case the Curie law is not fulfilled.

Keywords

EN

61.66.Hq; 76.30.Rn; 87.64.kh

Discipline

• 76.30.Rn: Free radicals
• 87.64.kh: EPR
• 61.66.Hq: Organic compounds

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 4
• Pages: 613-618

Dates

published

2010-10

received

2010-02-03

(unknown)

2010-09-09

Contributors

author

L. Najder-Kozdrowska

• Division of Spectroscopy of Functional Materials, Institute of Physics, Faculty of Physics and Astronomy University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland

author

B. Pilawa

• Department of Biophysics, Medical University of Silesia, Sosnowiec, Poland

author

E. Buszman

• Department of Pharmaceutical Chemistry, Medical University of Silesia, Sosnowiec, Poland

author

A. Więckowski

• Division of Spectroscopy of Functional Materials, Institute of Physics, Faculty of Physics and Astronomy University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland

author

L. Świątkowska

• Department of Instrumental Analysis School of Pharmacy, Medical University of Silesia, Sosnowiec, Poland

author

D. Wrześniok

• Department of Pharmaceutical Chemistry, Medical University of Silesia, Sosnowiec, Poland

author

W. Wojtowicz

• Division of Spectroscopy of Functional Materials, Institute of Physics, Faculty of Physics and Astronomy University of Zielona Góra, Szafrana 4a, 65-516 Zielona Góra, Poland

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Identifiers

DOI

10.12693/APhysPolA.118.613