Cr(VI) Trioxide as a Starting Material for the Synthesis of Novel Zero‑, One‑, and Two-Dimensional Uranyl Dichromates and Chromate-Dichromates
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https://figshare.com/articles/dataset/Cr_VI_Trioxide_as_a_Starting_Material_for_the_Synthesis_of_Novel_Zero_One_and_Two_Dimensional_Uranyl_Dichromates_and_Chromate_Dichromates/2424346
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资源简介：
Six
different dichromate-based uranyl compounds were obtained.
Their structures belong to four principally different but related
structure types with different dimensionality of basic structural
units. The units in Cs2(UO2)(Cr2O7)(NO3)2 (1) and (C6H11N2)2(UO2)(Cr2O7)2(H2O) (2) are unique, and these are the first “pure” uranyl-dichromates
known to date. The compounds Rb2(UO2)(CrO4)(Cr2O7) (3), (C2NH8)2(UO2)(CrO4)(Cr2O7) (4), (C2NH8)2(UO2)(CrO4)2(Cr2O7)(H2O)2 (5), and (C3NH10)2(UO2)(CrO4)2(Cr2O7)(H2O)2 (6) are novel representatives of a rather small
group of inorganic compounds containing both isolated CrO4 tetrahedra and dichromate Cr2O7 groups. The
structures of 5 and 6 contain compositionally
identical but topologically different ∞2[(UO2)(CrO4)2(Cr2O7)]2– sheets
(thus corresponding to different geometrical isomers), which have
not been reported previously in inorganic compounds. All novel phases
have been prepared with an excess of CrO3. “Pure”
dichromates are formed at pH < 1.5 and with prior hydrothermal
treatment of uranyl-chromate solution, whereas mixed chromate-dichromates
are formed at higher pH > 2 values.
创建时间：
2016-02-19
