Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions
Triplet States in DOPA-Melanin and in Its Complexes with Kanamycin and Copper Cu(II) Ions
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DOI：
10.12693/aphyspola.118.613
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发表时间：
2010-10-01
影响因子：
0.7
通讯作者：
Wojtowicz, W.
中科院分区：
文献类型：
--
作者：
Najder-Kozdrowska, L.;Pilawa, B.;Wojtowicz, W.
在100-300K温度范围内，用EPR谱研究了DOPA-黑色素(DOPA-eumelanin)的单基和双基形式。证明了DOPA-黑色素中存在三重态。EPR谱分析表明，在DOPA-黑色素及其与卡那霉素和铜(2+)离子的络合物中，存在两种顺磁中心。第一类为双基态，自旋S=1/2，服从居里定律。第二群的顺磁中心处于自旋为1的热激发三重态，此时居里定律不成立。
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.