Three new rubidium polychromates, Rb 2 [(UO 2 )(Cr 2 O 7 )(NO 3 ) 2 ] ( 1 ), γ-Rb 2 Cr 3 O 10 ( 2 ) and δ-Rb 2 Cr 3 O 10 ( 3 ) were prepared by combination of hydrothermal treatment at 220 °C and evaporation of aqueous solutions under ambient conditions. Compound 1 is monoclinic, P21/c$P{2}_{1}/c$, a = 13.6542(19), b = 19.698(3), c = 11.6984(17) Å, β = 114.326(2)°, V = 2867.0(7) Å 3 , R 1 = 0.040; 2 is hexagonal, P63/m$P{6}_{3}/m$, a = 11.991(2), c = 12.828(3) Å, γ = 120°, V = 1597.3(5) Å 3 , R 1 = 0.031; 3 is monoclinic, P21/n$P{2}_{1}/n$, a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)°, V = 1047.3(7) Å 3 , R 1 = 0.037. In the crystal structure of 1 , UO 8 bipyramids and NO 3 groups share edges to form [(UO 2 )(NO 3 ) 2 ] species which share common corners with dichromate Cr 2 O 7 groups producing novel type of uranyl dichromate chains [(UO 2 )(Cr 2 O 7 )(NO 3 ) 2 ] 2− . In the structures of new Rb 2 Cr 3 O 10 polymorphs, CrO 4 tetrahedra share vertices to form Cr 3 O 10 2− species. The trichromate groups are aligned along the 6 3 screw axis forming channels running in the ab plane in the structure of 2 . The Rb cations reside between the channels and in their centers completing the structure. The trichromate anions are linked by the Rb + cations into a 3D framework in the structure of 3 . Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems is discussed.

中文翻译：

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溶液酸度对含铀酰的多铬酸盐结晶的影响：Rb2 [（UO2）（Cr2O7）（NO3）2]的合成和晶体结构以及Rb2Cr3O10的两个新多晶型物

三种新的poly铬酸盐，Rb 2 [（UO 2）（Cr 2 O 7）（NO 3）2]（1），γ-Rb2 Cr 3 O 10（2）和δ-Rb2 Cr 3 O 10（3通过在220°C的水热处理和在环境条件下蒸发水溶液的组合制备。化合物1为单斜晶系，P21 / c $ P {2} _ {1} / c $，a = 13.6542（19），b = 19.698（3），c = 11.6984（17）Å，β= 114.326（2）° ，V = 2867.0（7）Å3，R 1 = 0.040; 2是六角形，P63 / m $ P {6} _ {3} / m $，a = 11.991（2），c = 12.828（3）Å，γ= 120°，V = 1597.3（5）Å3，R 1 = 0.031；3是单斜晶系，P21 / n $ P {2} _ {1} / n $，a = 7.446（3），b = 18.194（6），c = 7.848（3）Å，β= 99.953（9）°， V = 1047.3（7）Å3，R 1 = 0.037。在1的晶体结构中，UO 8双锥体和NO 3基团共享边缘以形成[（UO 2）（NO 3）2]物种，该物种与重铬酸盐Cr 2 O 7基团共享共同的角，从而产生新型的铀酰重铬酸盐链[（UO 2）（Cr 2 O 7）（NO 3）2] 2−。在新的Rb 2 Cr 3 O 10多晶型物的结构中，CrO 4四面体共享顶点以形成Cr 3 O 10 2-物种。三铬酸盐基团沿着6 3的螺杆轴形成通道排列，该通道在2的结构中沿ab平面延伸。Rb阳离子位于通道之间及其中心，从而完成了结构。三铬酸盐阴离子通过Rb +阳离子连接成3结构的3D骨架。讨论了溶液酸度对含铀酰的多铬酸盐结晶的影响。CrO 4四面体共享顶点以形成Cr 3 O 10 2-。三铬酸盐基团沿着6 3的螺杆轴形成通道排列，该通道在2的结构中沿ab平面延伸。Rb阳离子位于通道之间及其中心，从而完成了结构。三铬酸盐阴离子通过Rb +阳离子连接成3结构的3D骨架。讨论了溶液酸度对含铀酰的多铬酸盐结晶的影响。CrO 4四面体共享顶点以形成Cr 3 O 10 2-。三铬酸盐基团沿着6 3的螺杆轴形成通道排列，该通道在2的结构中沿ab平面延伸。Rb阳离子位于通道之间及其中心，从而完成了结构。三铬酸盐阴离子通过Rb +阳离子连接成3结构的3D骨架。讨论了溶液酸度对含铀酰的多铬酸盐结晶的影响。