
%0 Journal Article
%A Figgis, BN 
%A Reynolds, PA 
%A Williams, GA 
%A Lehner, N 
%T The crystal structure of deuterated <I>trans</I>-Tetraamminedinitronickel(II) at 4.2 K by neutron diffraction
%J Australian Journal of Chemistry
%D 1981/05/01
%V 34
%N 5
%P 993-999
%K 
%R https://doi.org/10.1071/CH9810993
%U https://www.publish.csiro.au/paper/CH9810993 
%X The crystal structure of deuterated trans-tetraamminedinitronickel(II), Ni(ND3)4(NO2)2, has been determined by single-crystal neutron diffraction methods at 4&#903;2 K. Crystals are monoclinic, C2/m, a 1058(l), b 672(1), c 586.3(3) pm, &#946; 114.82(5)º, Z = 2. Diffractometry has provided Bragg intensities for 219 independent reflections; and the structure has been refined by full-matrix least-squares methods to R(F2) 0&#903;070 and &#967;2 3&#903;8. There are slight differences in the molecular geometries determined by neutron diffraction and earlier X-ray determinations of Ni(NH3)4(NO2)2 at 295 and 130 K. Small, but significant, decreases are evident in all non-hydrogen bond lengths on decrease in temperature from 295 to 4&#903;2 K, up to a maximum of 2&#903;0(4) pm for the Ni-NH3/ND3 bond. The magnitudes of these decreases are correlated with the force constants of the bonds. The intermolecular geometry and thermal parameters show that in the ab plane there is a network of relatively strong, linear N-D&#903;&#903;&#903;O hydrogen bonds. In the c* direction there is a slightly bent, longer, N-D(1)&#903;&#903;&#903;O bond which is weaker. This causes a large amplitude of rigid-body translational motion in the c* direction, together with high thermal motion of D(1) in the b axial direction. 
