ChemInform Abstract: CdBiO<sub>2</sub>Cl: Synthesis and Powder Structure Solution.

Кирик, С. Д.; Yakovleva, Ekaterina G.; Shimanskii, A. F.; Kovalev, Yurii G.

doi:10.1002/chin.200210005

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“…The particular crystal chemistry of Bi 3+ lone pair ions leads to unusual physical and chemical properties such as luminescence, 1 selective oxidation catalysts, 2,3 or multiferroic properties. 4 The combination between Bi 2 O 3 and most voluminous anions (Cl − , Br − , I − ) or oxo-anions (IO 3− , 5 , 6 CO 3 2−7 ) often leads to two-dimensional (2D) structural types related to the parent Sillen phases in which layered fluorite-like [BiO] + units host intercalated anions, 8,9 as shown in Figure 1a. These units are stabilized due to the ability of Bi 3+ ions to form elementary oxo-centered tetrahedra OBi 4 or oxygen-deficient O(Bi,□) 4 groups, where □ defines vacancies.…”

Section: ■ Introductionmentioning

confidence: 99%

“…For instance, [Bi 1−x Co x O] 2 (SO 4 ) 1−x , where 0.14 ≤ x ≤ 0.18, 20 adopts a Silleń-X1 phase. 8,9 More intriguing cases involve pleated oxocentered layers found in both [Bi 2 CoO 3 ](SO 4 ) 6 (Figure 1e) and [Bi 13.33 Cu 2 O 16 ](SO 4 ) 6 21 with segregation of the transition metals within the layers. However, in both cases, the examination of reported crystal structures highlights strong SO 4 disorder.…”

Section: ■ Introductionmentioning

confidence: 99%

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Revised Bi/M Layered Oxo-Sulfate (M = Co, Cu): A Structural and Magnetic Study

et al. 2014

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The combination of oxo-bismuthite slabs with counter oxo-anions main often leads to a series of layered Sillen-related compounds. For electroneutrality, it is convenient that the structure incorporates aliovalent cations such as Bi(3+)/M(2+) ions that could be confined either in the Bi/O slabs or in the interleave. In the case of SO4(2-) oxo-anions, only two compounds have been reported for M = Co, Cu, while interesting magnetic topologies emerge in absence of any prior characterization. Our reinvestigation of these systems using crystal growth in Bi2O3 flux led to the full structural characterization of [Bi2CoO3](SO4) (I) and [Bi6.2367Cu1.6O8](SO4)3 (II), which both exhibit pleated [Bi/M/O] slabs running in doubled cells comparatively to previous reports. (I) shows an interesting weak ferromagnetism (∼0.2 μB/Co) below 17 K arising from Dzyaloshinskii-Moriya interactions in Co(2+) zigzag chains, while (II) is essentially a paramagnet despite the presence of Cu2O6 dimers. Finally in the novel [Bi6O6](CoO2)(SO4)2 (III), the Co(2+) ions are ordered with sulfate in the interleaves, leading to a noncentrosymmetric crystal structure.

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