Abstract
The compounds Ca2(SeO3)(Se2O5), Ba(SeO3), and Ba(Se2O5) were obtained at low-hydrothermal conditions from aqueous solutions of SeO2 by reaction with the respective earth alkaline carbonate. The crystal structures were determined by direct methods from single crystal X-ray diffraction data. Ca2(SeO3)(Se2O5): space group P*, Z=2, a=5.517(1), b=8.210(2), c=8.716(2) A, α=92.47(2), β=95.92(2), γ=97.15(2)°, V=389.0(2) A3, R 1=0.017; Ba(SeO3): space group P21/m, Z=2, a=4.677(2), b=5.645(2), c=6.851(3) A, β=107.16(2)°, V=172.8(1) A3, R 1=0.022, Ba(Se2O5): space group P21/c, Z=4, a=4.553(1), b=11.724(3), c=9.758(2) A, β=92.66(2)°, V=520.3(2)A3, R1=0.027. All three compounds have framework structures; in the case of Ca2(SeO3)(Se2O5), subunits of edge-sharing CaO n polyhedra forming sheets parallel to (010) can be emphasized. Ba(SeO3) belongs to the structure type of KClO3. In Ba(Se2O5), chains of face-sharing BaO9 polyhedra along [100] are present. The calcium atoms are 7- and 8-coordinated with mean Ca–O bond lengths of 2.42 and 2.48 A, the barium atoms have nine oxygen ligands with mean Ba–O bond lengths of 2.87 A.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
