Neptunium chemistry is covered in this lecture. Nuclear properties and synthesis of neptunium are described, with emphasis placed on the isotopes 235-239Np. The synthesis and properties of neptunium metal, alloys, and intermetallic compounds are introduced. The lecture describes neptunium compound synthesis, with resulting thermodynamic and structural properties provided. Neptunium organometallic and coordination compounds are also presented. Information on neptunium solution speciation, redox, and spectroscopy is given, with trends based on oxidation state examined. A presentation of analytical methods useful in neptunium chemistry, including Mössbauer spectroscopy, concludes the lecture. Comparisons are made with uranium chemistry to provide trends in the actinides.
When you talk about the binary oxides of neptunium in the lecture, you say that "NpO2 is the stable oxide" and discuss how Np2O5 decomposes to NpO2 at higher temperatures. The quiz asks us to identify the stable binary oxides of neptunium, so I'm confused whether Np2O5 should be included--isn't it stable at lower temperatures?
ReplyDeletegood comments. What I mean by stable is that it can exist easily in the lab. If I take Np2O5 and heat it up, NpO2 forms. Both can be stable in the lab. However we dont get NpO, that would be unstable.
DeletePlease let me know if you need more details.
That clears things up, thanks.
DeleteFor the first question of the quiz, is it asking about how NpO2(+) disproportionates into Np4(+) and NpO2(2+)?
ReplyDeleteThat's what I thought, but since NpO2+ is Np(V), it must oxidize to Np(VI) so I just chose those 2 wavelengths. That's why I asked you about oxidation hahaha
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