Optically“silent”neptunium(Ⅴ)-nitrate complex in ionic liquid  

作　　者：Xue Dong Zhipeng Wang Qiang Yan Haiwang Liu Yuxiao Guo Hong Cao Jing Chen Chao Xu 

机构地区：[1]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China

出　　处：《Chinese Chemical Letters》2022年第7期3531-3533,共3页中国化学快报（英文版）

基　　金：the financial support from the National Natural Science Foundation of China(Nos.21790372 and 21822606);Beijing Natural Science Foundation(No.JQ20041)。

摘　　要：The complexation of pentavalent neptunium,Np(Ⅴ),with nitrate ion in an ionic liquid solution has been studied spectroscopically for the first time.The characteristic f-f transition absorption band of Np(Ⅴ)in the NIR region changes significantly upon the titration of nitrate ion into the solution,revealing strong complexation of Np(Ⅴ)with nitrate ion in the ionic liquid.Most notably,the absorption band of Np(Ⅴ)almost disappears when a sufficiently high concentration of nitrate ion is present in the solution.Such a rare optically“silent”species can be assigned to the 1:2 Np(Ⅴ)/nitrate complex with a centrosymmetric coordination environment where Np sits at the inversion center.

关 键 词：NEPTUNIUM Ionic liquid COMPLEXATION ABSORPTION f-f transition 

分 类 号：O641.4[理学—物理化学]