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Crystal structure of the monoclinic polymorph [Co(NH3)5NO2]I2

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Abstract

X-ray diffraction study of [Co(NH3)5NO2]I2 needle crystals was carried out at 293 and 150 K: an automatic diffractometer, MoKα radiation, λ=0.71073 Å, space group C2/m, Z=8. The unit cell parameters are a=24.047(5), b=7.648(2), c=17.599(4) Å, β=132.48(3)°, Vcell=2387.0910) Å3, dcalc=2.479 g/cm3 at 293 K and a=23.763(5), b=7.577(2), c=17.551(4), Å, β=132.12(3)°, Vcell=2343.9(1) Å3, dcalc=2.516 g/cm3 at 150 K, respectively. The RF values are 11.93% (at 293 K) and 12.30% (at 150 K) for 2032 and 2948 observed reflections, respectively. The structure is of the ionic-island type. [Co(NH3)5NO2]2+ complex cations are clustered in [Co(NH3)5NO2]4 “supercations,” which are linked by N(NH 3)...O(NO 2) hydrogen bonds and have 2/m symmetry. A shortening of the distances between certain I ions is indicative of their noticeable interaction. Short contacts also exist between the iodine anions and the ammonia molecules of the complex cations, suggesting the possible formation of NH3...I hydrogen bonds. The structure investigated is compared with the structures of the orthorhombic and tetragonal modifications of [Co(NH3)5NO2]I2 along with the structures of α-AgI and transition-metal hexaammoniate polyiodides.

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Authors
  1. E. V. Boldyreva
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  2. N. V. Podberezskaya
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Additional information

Institute of Solid State Chemistry and Processing of Mineral Raw Materials, Siberian Branch, Russian Academy of Sciences. Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences. Novosibirsk State University. Translated fromZhurnal Strukturnoi Khimii, Vol. 36, No. 1, pp. 168–177, January–February, 1995.

Translated by T. Yudanova

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Boldyreva, E.V., Podberezskaya, N.V. Crystal structure of the monoclinic polymorph [Co(NH3)5NO2]I2 . J Struct Chem 36, 146–154 (1995). https://doi.org/10.1007/BF02577762

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  • DOI: https://doi.org/10.1007/BF02577762

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