
TY  - JOUR
A1  - Becker, H 
A1  - Hall, SR 
A1  - Skelton, BW 
A1  - White, AH 
T1  - On the molecular geometry of 1,2-Di(9-anthryl)ethanes. Crystal structures of two crystalline modifications of 1,2-Bis(10-acetoxy-9-anthryl)ethane
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1982
VL  - 35
IS  - 11
SP  - 2357
EP  - 2365
KW  - 
UR  - https://doi.org/10.1071/CH9822357 
N2  - In order to define molecular conformations, the crystal structures of two crystalline phases of 1,2- bis(10-acetoxy-9-anthryl)ethane have been determined by single-crystal X-ray diffraction methods at 295 K. Both phases are monoclinic, P21/c. For the '&#945;'-phase, a 7.609(2), b 14.469(3), c 11.358(3) Å &#946;, 96.39(2)º, Z 2. The final residual was 0.034 for 1341 'observed' reflections; the molecule is centrosymmetric about a crystallographic inversion centre. For the '&#946;'-phase, a 31.264(15), b 5.248(3), c 15.718(6) Å,&#946; 97.84(3)º, Z 4, the final residual was 0.052 for 972 'observed' reflections. In this structure two independent, centrosymmetric molecules are found. In both &#945;- and &#946;-form, the molecular conformation is thus 'stretched' rather than 'eclipsed'. The packing patterns of the two modifications have been correlated with their crystal luminescence properties. 
ER  -

