Pentavalent Lanthanide Nitride-Oxides:NPrO and NPrO-

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  The chemistry of lanthanides is dominated by the low-valent+Ⅲ or+Ⅱ oxidation states due to the chemical inertness of the 4f valence electrons.Until recently the highest known oxidation state of the whole lanthanide series had been+IV,as is found commonly in Ce as well as in Pr,Nd,Tb and Dy [1].
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