Abstract
p-Phenylenediamine dihydrobromide and p-phenylenediamine dihydrochloride are found to be isomorphous. p-Phenylenediamine dihydrobromide is triclinic with lattice parameters, $a=4.52{\pm}0.02{\AA}\;b=6.13{\pm}0.02{\AA},c=8.88{\pm}0.03{\AA},\;{\alpha}=111{\pm}1^{\circ},\;{\beta}=97{\pm}1^{\circ},\;{\gamma}=101{\pm}1^{\circ}.$ It belongs to space group $P\bar{1}$, and there is one molecule in the unit cell. The crystal structure is determined according to the method of Fourier synthesis from the electron density projections in three principal crystallographic axes. The crystal structure, thus determined is refined by the method of two-dimensional difference Fourier synthesis.
p-Phenylenediamine dihydrobromide 와 p-phenylenediamine dihydrochloride는 isomorphous임을 밝혔다. p-Phenylenediamine dihydrobromide는 三斜軸晶系(三斜晶系)에 屬하며 cell dimension 은 $a=4.52{\pm}0.02,\;b=6.13{\pm}0.02,\;c=8.88{\pm}0.03{\AA},\;{\alpha}=111{\pm}1^{\circ},\;{\beta}=97{\pm}1^{\circ},\;{\gamma}=101{\pm}1^{\circ}$ 이며 單位細胞(單位格子)속에 들어있는 化學單位數는 1이다. 이 物質의 結晶構造가 3結晶軸에 따라 投影한 電子密度에 依하여 決定되었으며 二次元的인 Fourier synthesis에 依하여 精密化하였다.