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The crystal structures of cis-sodium hyponitrite and the alkalimetal carbonates M 2 CO 3  (M = Na, K, Rb, Cs) are closely related to each other. The monoclinic space groups of cis-Na 2 N 2 O 2 , γ-K 2 CO 3 , Rb 2 CO 3 , Cs 2 CO 3  (all P12 1 /c1), β-K 2 CO 3  (C12/c1) and β-/γ-Na 2 CO 3  (C12/m1) are subgroups of the common supergroup Cmcm. The ‘aristo-type’ of all of these structures is represented by α-Na 2 CO 3  and α-K 2 CO 3  crystallizing in P6 3 /mmc. At comparing the monoclinic crystal structures of cis-Na 2 N 2 O 2 , β-Na 2 CO 3  and Rb 2 CO 3  it becomes evident that the reduction of symmetry with respect to the supergroup Cmcm is related to the size of the alkalimetal cation in the case of the carbonates, whereas in cis-Na 2 N 2 O 2  it is due to the different shape of the N 2 O 2  2-  as compared to the CO 3  2-  anion.

zeitschrift für kristallographie - crystalline materials

Strukturverwandtschaften zwischen cis-Natriumhyponitrit und den Alkalimetallcarbonaten M 2 CO 3  (M = Na, K, Rb, Cs) dargestellt durch Gruppe-Untergruppe Beziehungen