New structure type in the morphotropic series of A
2
+
M
2
2+
(MoO4)3: crystal structure of Rb2Cu2(MoO4)3 |
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Authors: | S F Solodovnikov Z A Solodovnikova |
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Institution: | (1) Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, USSR |
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Abstract: | Isostructural compounds A2Cu2(MoO4)3 (A = Rb, Cs) were synthesized. The new structure type of the compounds was established for the rubidium-containing compound as an example (a =27.698,b =5.102,c =19.292 å, Β = 707.26?,Z = 8, space group C2/c, R = 0.016). The structure is characterized by pairs of infinite wolframite-like ribbons of CuO(4+2) octahedra stretching along 010] and additionally bridged by MoO4 tetrahedra. The tetrahedra located between the ribbons weakly interact with each other at distances Mo-O of 2.545 and 2.853 å. There are four such quasione-dimensional copper-molybdenum-oxygen radicals per unit cell; the radicals are united into a single structure by rubidium ions having coordination numbers (CN) 9 and 10. |
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