Syntheses, structures, and properties of Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) and Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3}
- Department of Chemistry and Biochemistry, 179 Chemistry Building, Auburn University, Auburn, AL 36849 (United States)
Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) has been synthesized by reacting AgNO{sub 3}, MoO{sub 3}, and selenic acid under mild hydrothermal conditions. The structure of this compound consists of cis-MoO{sub 2} {sup 2+} molybdenyl units that are bridged to neighboring molybdenyl moieties by selenate anions and by a bridging oxo anion. These dimeric units are joined by selenite anions to yield zigzag one-dimensional chains that extended down the c-axis. Individual chains are polar with the C {sub 2} distortion of the Mo(VI) octahedra aligning on one side of each chain. However, the overall structure is centrosymmetric because neighboring chains have opposite alignment of the C {sub 2} distortion. Upon heating Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3}) looses SeO{sub 2} in two distinct steps to yield Ag{sub 2}MoO{sub 4}. Crystallographic data: (193 K; MoK{alpha}, {lambda}=0.71073 A): orthorhombic, space group Pbcm, a=5.6557(3), b=15.8904(7), c=15.7938(7) A, V=1419.41(12), Z=4, R(F)=2.72% for 121 parameters with 1829 reflections with I>2{sigma}(I). Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} was synthesized by reacting AgNO{sub 3} with MoO{sub 3}, SeO{sub 2}, and HF under hydrothermal conditions. The structure of Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} consists of three crystallographically unique Mo(VI) centers that are in 2+2+2 coordination environments with two long, two intermediate, and two short bonds. These MoO{sub 6} units are connected to form a molybdenyl ribbon that extends along the c-axis. These ribbons are further connected together through tridentate selenite anions to form two-dimensional layers in the [bc] plane. Crystallographic data: (193 K; MoK{alpha}, {lambda}=0.71073 A): monoclinic, space group P2{sub 1} /n, a=7.7034(5), b=11.1485(8), c=12.7500(9) A, {beta}=105.018(1) V=1002.7(2), Z=4, R(F)=3.45% for 164 parameters with 2454 reflections with I>2{sigma}(I). Ag{sub 2}(MoO{sub 3}){sub 3}SeO{sub 3} decomposes to Ag{sub 2}Mo{sub 3}O{sub 10} on heating above 550 deg. C. - Graphical abstract: A view of the one-dimensional [(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3})]{sup 4-} chains that extend down the c-axis in the structure of Ag{sub 4}(Mo{sub 2}O{sub 5})(SeO{sub 4}){sub 2}(SeO{sub 3})
- OSTI ID:
- 21015815
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 5; Other Information: DOI: 10.1016/j.jssc.2007.02.020; PII: S0022-4596(07)00094-1; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydrothermal synthesis, structure, and magnetic properties of Pu(SeO{sub 3}){sub 2}
Hydrothermal synthesis, structure, and magnetic properties of the mixed-valent Np(IV)/Np(V) selenite, Np(NpO{sub 2}){sub 2}(SeO{sub 3}){sub 3}.