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Complex cobalt silicates and germanates crystallizing in a porous three-dimensional framework structure
CrystEngComm ( IF 3.1 ) Pub Date : 2020/01/10 , DOI: 10.1039/c9ce01662g
Mohammad Usman 1, 2, 3, 4 , Mark D. Smith 1, 2, 3, 4 , Vancho Kocevski 2, 3, 4, 5 , Theodore Besmann 2, 3, 4, 5 , Hans-Conrad zur Loye 1, 2, 3, 4
Affiliation  

Four new cesium-containing cobalt oxide complexes were reported. Cs(Co0.5Si0.5)SiO4 (1), Cs1.29(5)Co0.69(5)Ge1.81(5)O5 (2), and its ordered analogue Cs2CoGe4O10 (3) were synthesized using a mixed CsCl–CsF flux at 850 °C or 900 °C. The structure of (1) closely resembles that of known zeolite and feldspar structures, and (1) crystallizes in the noncentrosymmetric monoclinic space group Im with lattice parameters of a = 8.9926(4) Å, b = 5.4599(2) Å, c = 9.3958(6) Å, and β = 91.5928(18)°. Complexes (2) and (3) crystallize in the same new structure with a highly porous three-dimensional framework in the tetragonal space group I[4 with combining macron] with lattice parameters of a = 7.4239(14) Å and c = 13.169(3) Å for (2) and a = 7.3540(6) Å and c = 13.1122(11) Å for (3). The formation of (2) vs. (3) can be controlled based on slight variations in the quantities of the starting materials. Single-crystal-to-single-crystal ion exchange of (1) in a molten RbNO3 bath resulted in 14% Cs exchange with Rb, affording the composition Cs0.86Rb0.14(Co0.5Si0.5)SiO4 (4). First-principles density functional theory calculations were performed to elucidate the electronic and magnetic properties and stabilities of (1) and (3) at 0 K.

中文翻译:

复杂的硅酸钴和锗酸盐在多孔三维骨架结构中结晶

据报道有四种新的含铯的氧化钴配合物。Cs(Co 0.5 Si 0.5)SiO 41),Cs 1.29(5) Co 0.69(5) Ge 1.81(5) O 52)及其有序类似物Cs 2 CoGe 4 O 103)的合成在850°C或900°C下混合的CsCl–CsF通量。的结构(1)非常类似于已知的沸石和长石的结构,及(1)的非中心对称斜空间群中结晶与晶格参数= 8.9926(4),b= 5.4599(2),c= 9.3958(6),和β= 91.5928(18)°。络合物(2)和(3)在相同的新结构中以高度多孔的三维骨架在四方空间群I中结晶[4与组合光子组合],晶格参数为(2a = 7.4239(14)Å和c = 13.169(3)Å ),对于(3),a = 7.3540(6)Å,c = 13.1122(11)Å 。(2vs.3的形成)可以根据原料的少量变化进行控制。(1)在熔融的RbNO 3浴中的单晶至单晶离子交换导致与Rb的Cs交换率为14%,提供了组成Cs 0.86 Rb 0.14(Co 0.5 Si 0.5)SiO 44)。进行了第一性原理密度泛函理论计算,以阐明(1)和(3)在0 K时的电子和磁性及稳定性。
更新日期:2020-02-13
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