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1.        About EPR spectra.
A weak and broad EPR signal (g =2.12) may be attributed to generation of NH radicals and synergetic effect of copper ions, which seems to be incorrect. Firstly, EPR signal for radicals were always around g = 2.00 with small linewidth (about 20 Gauss). Secondly, radicals may be generated in N atoms of pyridine, such as viologen redical (Angew. Chem. Int. Ed. 2007, 46, 3249 ¨C3251). Thirdly, no evidence for appearance of mixed copper valence of 1P was found. Fourthly, whether impurities or vacancy factor lead to unusual EPR signal.
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