
TY  - JOUR
A1  - Engelhardt, LM 
A1  - Harrowfield, JM 
A1  - Sargeson, AM 
A1  - White, AH 
T1  - Synthesis and Structure of (1,8-Diammonio-3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane)-nickel(II) Tetrachloride Monohydrate
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1993
VL  - 46
IS  - 1
SP  - 127
EP  - 133
KW  - 
UR  - https://doi.org/10.1071/CH9930127 
N2  - 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;. 
ER  -

