โ Scribed by Joseph B. Lambert; Yan Zhao; Charlotte L. Stern
No coin nor oath required. For personal study only.
Four benzenecarboxylic acid groups attached to silicon, (4-CO 2 HC 6 H 4 ) 4 Si, form an infinite two-dimensional pleated sheet in the solid state composed of cyclic units of 78 heavy atoms in the shape of a large boat-like structure held together by six complementary hydrogen-bonded units. Only three carboxylic acid groups per molecule are incorporated into the superboat. The material was crystallized from acetic acid. As a result, one molecule of acetic acid is bound to the fourth carboxylic acid group, preventing the structure from attaining a diamondoid lattice. Sixfold repetition of interpenetrating lattices restricts porosity.
๐ SIMILAR VOLUMES
We describe the calculation of photonic band structures of two-dimensional lattices made of more than one dielectric array. In particular, we study a face-centered graphite (fcg) structure obtained by an arrangement of two sets of cylindrical rods, one located at the vertices of regular hexagons (gr