Crystal Packing of Potentially Mesomorphic Azobenezene Derivatives <em>Rem><sub>1sub>–C<sub>6sub>H<sub>4sub>–N=N–C<sub>6sub>H<sub>4sub>–<em>Rem><sub>2sub> (<em>Rem><sub>1sub>,<em>Rem><sub>2sub> = CH<sub>3sub>COO,C<sub>2sub>H<sub>5sub>O; CH<sub>2sub>=C(CH<sub>3sub>)COO,C<sub>2sub>H<sub>5sub>; C<sub>6sub>H<