
%0 Journal Article
%A Engelhardt, LM 
%A Harrowfield, JM 
%A Sargeson, AM 
%A White, AH 
%T Synthesis and Structure of (1,8-Diammonio-3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane)-nickel(II) Tetrachloride Monohydrate
%J Australian Journal of Chemistry
%D 1993/01/01
%V 46
%N 1
%P 127-133
%K 
%R https://doi.org/10.1071/CH9930127
%U https://www.publish.csiro.au/paper/CH9930127 
%X The synthesis and single-crystal X-ray structure determination of the title compound are described. Crystals are monoclinic, P 21, a 16.164(9), b 8.277(3), c 8.829(4) &#506;, &#946; 102.86(4)&#176;, Z 2; 2666 independent 'observed' diffractometer data [I > 3&#963;(I)] were refined to a residual of 0.045. The cation is unusual amongst complexes of sarcophagine (3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane) cage amines in adopting a lel2ob conformation, seemingly in response to hydrogen bonding/crystal packing forces. In consequence, unlike the tetranitrate analogue in which Ni-N bond distances are dispersed over a narrow range (2.097(5)-2.119(5) &#506;; mean 2.109 &#506;], the coordination sphere is more distorted with one pair of Ni-N distances, cis to each other, being short at 2.081(5) and 2.086(5) &#506;, while the other four are long, ranging from 2.116(5) to 2.135(5) &#506;, the mean of this array being 2.111  &#506;. 
