
%0 Journal Article
%A Taylor, D 
%T The crystal and molecular structure of 1&#945;,9&#946;-Dichloro-2,2,10,10-tetramethoxy[2,2](2,6)pyridinophane
%J Australian Journal of Chemistry
%D 1978/09/01
%V 31
%N 9
%P 1953-1957
%K 
%R https://doi.org/10.1071/CH9781953
%U https://www.publish.csiro.au/paper/CH9781953 
%X Crystals of the title compound, C18H20Cl2N2O4, are monoclinic, a 14.706(1), b 17.168(1), c 7.269(1) &#506;, &#946; 92.72(1)&#176;, space group P21/c with Z = 4. The structure was solved from diffractometer data by direct methods. Block-diagonal least-squares refinement converged at R 0.037, Rw 0.045 for 2103 reflections with I &#8805; 3&#963;(I) which had been corrected for absorption (&#956; 34.0 cm-1). The asymmetric unit is comprised of two independent half-molecules, each molecule being centrosymmetric. The pyridine rings are distorted from planarity, with a maximum deviation of 0.10 &#506; at the nitrogen atoms, as a consequence of the short intramolecular N...N contacts of 2.476(4) and 2.473(5) &#506;. 
