Y. Komiyama
Mar 1, 1956
Citations
0
Influential Citations
13
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The crystal structure of potassium tetrani-trodiammine-cobaltiate (III), K[Co(NH3)2(NO2)4], prepared according to the method of Jorgen-sen, has been determined by two-dimensional Fourier method. The orthorhombic unit cell has the dimensions a=11.38±0.02 A, b=12.95±0.02 A and c=6.76±0.01 A containing four formula units in it (Fe Kα, λ=1.937 A), and the space group is D24-P212121. The shape and size of a complex ion was found to be similar to the one found in crystals of silver salt, Ag[Co(NH3)2(NO2)4]. Two ammonia molecules are co-ordinated to the central cobalt atom in trans-positions, with Co–N distance 2.00 A.The average dimensions of the nitro groups were: N–O = 1.22 A and ∠ONO = 118°, in agreement with the results obtained for other nitro-complex compounds of cobalt. Each potassium atom is surrounded by eight oxygen atoms of the nitro-groups with distances ranging from 2.79 A to 3.26 A.