Abstract
Abstract Single crystals of slightly hygroscopic barium nitrite Ba(NO2)2 were prepared by thermal decomposition of barium nitrite monohydrate and subsequent recrystallization in a solution of methanol and p-xylene. The compound crystallizes in the orthorhombic space group P212121 with a = 7.6331(16) Å, b = 8.3671(36) Å, c = 6.7336(8) Å and Z = 4. The structure was determined from X-ray intensities measured on a four-circle diffractometer and refined to R = 0.035 and wR = 0.048. The barium atoms exhibit an elevenfold coordination made up by nine oxygen atoms within distances ranging from 2.776(6) Å to 3.010(6) Å and two nitrogen atoms within distances of 3.059(7) Å and 3.125(7) Å. Values for the O – Ba – O angles range from 41.5(2)° to 151.1(2)°. The N – O distances are in the range 1.236(9) to 1.265(8) Å.
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