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The title compound MO 8 O 26 (C 7 NH 10 ) 4  crystallizes in the monoclinic system, space group  P 2 1 / n  with parameters  a  = 13.807(4),  b  = 10.979(9),  c  = 14.319(5)Å, and  β  = 91.53(3)°. The crystal structure has been refined to  R  = 0.024 for 3530  hkl  reflections. The cell contains a [MO 8 O 26 ] 4−  polyanion and two crystallographically independent 3-ethyl pyridinium cations. The network exhibits infinite chains of polyanions bridged by one of these 3-ethyl pyridinium cations and piled up in the (101) plane. In between these layers [MO 8 O 26 (C 7 NH 10 ) 2 ] n  2−  the remaining cations are inserted. Both independent cations exhibit analogous conformational features.

Structure cristalline de l'octamolybdate de 3-ethyl pyridinium ápolyanions discrets [MO 8 O 26 ] 4−