Abstract
Variation of the unit cell parameters of [Co(NH3)5ONO]X2 (X=Cl−, Br−) as a function of hydrostatic pressure is studied by powder X-ray diffractometry in cooled diamond anvils. Pressures of up to 5.0 GPa lead to anisotropic lattice distortion but not to phase transitions. The anisotropy of lattice compression of the nitrito isomers is qualitatively distinct from that of the related structures of the corresponding nitro isomers, which differ mainly in the structure of complex cations. The following specific interactions are responsible for the anisotropy of compression for both nitrito and nitro isomers: hydrogen bonds between the NO2 and NH3 ligands of the neighboring cations and between the NH3 ligands and the halide anions; specific interactions of the NO2 ligands of the neighboring cations with each other and of the NO2 ligands with the halide anions.
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