查看“︁二碘化镨”︁的源代码

{{NoteTA|G1=Chemistry}}
{{Chembox
|ImageFile=LaI2.png
|Section1={{Chembox Identifiers
|CASNo=65530-47-4}}
|Section2={{Chembox Properties
| Appearance= 青铜色固体<ref name="William M. Haynes" />
|Pr=1|I=2
| Density=
| MeltingPt= 758 °C<ref name="William M. Haynes">{{cite book | last=Haynes | first=William M. | title=CRC handbook of chemistry and physics : a ready-reference book of chemical and physical data. | publisher=CRC | publication-place=Boca Raton, Fla. | date=2012 | isbn=978-1-4398-8049-4 | oclc=793213751 |page=84}}</ref>
|BoilingPt=|Solubility=
}}
|Section8={{Chembox Related
|OtherCpds=[[碘化镨]]
|OtherCations=[[二碘化镧]]<br />[[二碘化铈]]
}}
}}

'''二碘化镨'''是化学式 PrI<sub>2</sub>的[[镨]]的[[碘化物]]。它是[[电子盐]]，真实结构为Pr<sup>3+</sup>(I<sup>−</sup>)<sub>2</sub>e<sup>−</sup>。

== 制备 ==
二碘化镨可以由[[碘化镨]]和金属镨在800&nbsp;°C至900&nbsp;°C的[[真空]]下反应而成：<ref name="brauer">{{cite book | author=hrsg. von Georg Brauer. Unter Mitarb. von M. Baudler | title=Handbuch der präparativen anorganischen Chemie / 1. | publisher=Enke | publication-place=Stuttgart | date=1975 | isbn=3-432-02328-6 | oclc=310719485 | language=de |page=1081}}</ref>
:<math>\mathrm{ Pr + 2 \ PrI_3 \longrightarrow 3 \ PrI_2}</math>

它也可以由镨和[[碘化汞]]反应而成：<ref name="brauer" />
:<math>\mathrm{Pr + HgI_2 \longrightarrow PrI_2 + Hg}</math>

二碘化镨是由John D. Corbett于1961年首次合成的。<ref name="Gerd Meyer, Dieter Naumann, Lars Wesemann">{{cite book | last=Meyer | first=G. | last2=Naumann | first2=Dieter | last3=Wesemann | first3=Lars | title=Inorganic chemistry in focus. III | publisher=Wiley-VCH | publication-place=Weinheim | date=2006 | isbn=978-3-527-60993-2 | oclc=86225074 |page=45}}</ref>

== 性质==
二碘化镨是有金属光泽的青铜色固体，极易[[水解]]。<ref name="brauer" />它有五种[[晶体结构]]，分别是[[二硅化钼|MoSi<sub>2</sub>]]结构、六方[[二硫化钼|MoS<sub>2</sub>]]结构、三方MoS<sub>2</sub>结构、[[氯化镉]]结构和[[尖晶石]]结构。<ref name="Ralf Alsfasser, Erwin Riedel">{{cite book | last=Riedel | first=Erwin | last2=Alsfasser | first2=Ralf | title=Moderne anorganische Chemie : mit CD-ROM : [133 Tabellen] | publisher=Gruyter | publication-place=Berlin | date=2007 | isbn=978-3-11-019060-1 | oclc=237200027 | language=de |page=366}}</ref>氯化镉结构的二碘化镨属于[[三方晶系]]，空间群 R{{overline|3}}m (No. 166)，[[晶格参数]]为 a = 426.5&nbsp;pm和c = 2247,1&nbsp;pm；而尖晶石结构的二碘化镨则是立方晶系的，空间群F{{overline|4}}3 (No. 216)，晶格参数 a = 1239.9&nbsp;pm。<ref name="DOI10.1016/j.jallcom.2004.03.046">{{cite journal | last=Gerlitzki | first=Niels | last2=Meyer | first2=Gerd | last3=Mudring | first3=Anja-Verena | last4=Corbett | first4=John D. | title=Praseodymium diiodide, PrI2, revisited by synthesis, structure determination and theory | journal=Journal of Alloys and Compounds | publisher=Elsevier BV | volume=380 | issue=1-2 | year=2004 | issn=0925-8388 | doi=10.1016/j.jallcom.2004.03.046 | pages=211–218}}</ref>

== 参考资料==
<references />
{{镨化合物}}
{{碘化物}}

[[Category:镨化合物]]
[[Category:碘化物]]
[[Category:电子盐]]
[[Category:1960年代发现的物质]]