Structure cristalline des bis(dichromate) de bismuth et de thallium et bis(dichromate) d'ammonium et de bismuth
Résumé
Abstract. BiTl(Cr2O7)2, Mr = 845.3, monoclinic, P21/a, a = 8.310 (11), b = 17.092 (7), c = 8.645
(7) Å, b = 91.65 (4)°, V = 1227.3 Å3, Z = 4, Dm = 4.52(1), Dx = 4.574(12) Mg.m-3, MoKa, l =
0.71069 Å, m = 30.44 mm-1, F(000) = 1488, room temperature, R = 0.07 for 1680 reflections.
Bi(NH4)(Cr2O2)2, Mr = 659.00, monoclinic, P21/a, a = 8.298 (7), b = 17.020 (7), c = 8.719(9) Å, b
= 91.53 (4)°, V = 1230.8 Å3, Z = 4, Dm = 3.52(1), Dx = 3.556(9) Mg.m-3, MoKa, l = 0.71069 Å, m
= 17.17 mm-1, F(000) = 1208, room temperature, R = 0.06 for 1279 reflections.
These structures are isotypic with BiRb(Cr2O7)2. The structure contains [BiO8] polyhedra linked
together by [Cr2O7] groups to build complex layers in the ab plane. All the layers are linked by Tl+ or NH4+ ions.
These structures are isotypic with BiRb(Cr 2 O 7) 2. The structure contains [BiO 8 ] polyhedra linked together by [Cr 2 O 7 ] groups to build complex layers in the ab plane. All the layers are linked by Tl + or NH 4 + ions.
Domaines
Chimie
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