
%0 Journal Article
%A Frederiksen, JM 
%A Horn, E 
%A Snow, MR 
%A Tiekink, ERT 
%T The Crystal Structures of the Diastereoisomers (+)589-(&#923;-&#948;-&#948;)-<I>cis</I>-Bis(ethylenediamine)dinitrocobalt(III)Hydrogen-D-tartrate Monohydrate and (-)589-(&#923;-&#955;-&#955;)-<I>cis</I>-Bis(ethylenediamine)dinitrocobalt(III) Hydrogen-D-tartrate Dihydrate
%J Australian Journal of Chemistry
%D 1988/09/01
%V 41
%N 9
%P 1305-1314
%K 
%R https://doi.org/10.1071/CH9881305
%U https://www.publish.csiro.au/paper/CH9881305 
%X The crystal structures of the diastereoisomers formed between the hydrogen-D-tartrate anion and the cations (+)-(&#923;-[Co(en)2(NO2)2]+ (1) and (-)-(&#916;)-[Co(en)2(NO2)2]+ (2) have been determined by three-dimensional X-ray analysis. The crystal structures are comprised of octahedrally coordinated cobalt atoms, hydrogentartrate anions and water molecules interconnected by a complex hydrogen bonding network. In (1), columns of complex parallel to a 21 screw axis along a, are linked via hydrogen bonding contacts to a total of six chains of 'head-to-tail' hydrogentartrate strands. In contrast, in (2) the chains of hydrogentartrate anions associate with each other to form well defined 'walls' which sandwich hydrogen-bonded columns of complex cations such that the structure may be thought of as a layer structure of hydrogentartrate anions and complex cations. Crystals of both compounds are orthorhombic, space group P212121 with Z = 4, unit cell parameters for (1): a 7.670(1), b 12.160(1), c 18.028(1)&#506;, V 1681.4 &#506;3 and for (2): a 7.735(2), b 8.505(5), c 26.846(9) &#506;, V 1766 1 &#506;3. The structures were each refined by a full-matrix least-squares procedure to final R 0.026, Rw 0.027 for 1764 reflections with I &#8805; 2.5&#963;(I) for (1) and R 0.065, Rw 0.073 for 1322 reflections for (2). 
