Stability study of tyrosinate radical in a restricted phyllomorphous medium

被引:13
作者
Gournis, D [1 ]
Deligiannakis, Y
Karakassides, MA
Boussac, A
Ioannidis, N
Petridis, D
机构
[1] Univ Ioannina, Dept Mat Sci & Engn, GR-45110 Ioannina, Greece
[2] Univ Ioannina, Dept Environm & Nat Resources Management, GR-30100 Agrinion, Greece
[3] CEA Saclay, Dept Biol Celulaire & Mol, Sect Bioenerget, F-91191 Gif Sur Yvette, France
[4] NCSR Demokritos, Inst Mat Sci, GR-15310 Athens, Greece
关键词
D O I
10.1021/la026292u
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The elusive tyrosinate radical has been stabilized in the layers of synthetic laponite on intercalated tyrosinate ester molecules. According to EPR, XRD, and FT-IR data, the tyrosinate ester molecules adopt a horizontal orientation between the clay surfaces, with the aromatic rings almost perpendicular to the clay layers, giving an intersheet separation of 4.8 Angstrom. The radical remains stable for over two months, while it is quickly reduced by nitric oxide. The observed long-term stability of the radical is due to electrostatic interactions with the negative surface of the clay as well as to sequestration phenomena which protect the radical from polymerization.
引用
收藏
页码:10024 / 10029
页数:6
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