The crystal structures of three quinuclidine-based compounds, namely (1-azabicyclo[2.2.2]octan-3-ylidene)hydrazine monohydrate, C7H13N3·H2O (1), 1,2-bis(1-azabicyclo[2.2.2]octan-3-ylidene)hydrazine, C14H22N4 (2), and 1,2-bis(1-azoniabicyclo[2.2.2]octan-3-ylidene)hydrazine dichloride, C14H24N4
2+·2Cl− (3), are reported. In the crystal structure of 1, the quinuclidine-substituted hydrazine and water molecules are linked through N—H...O and O—H...N hydrogen bonds, forming a two-dimensional array. The compound crystallizes in the centrosymmetric space group P21/c. Compound 2 was refined in the space group Pccn and exhibits no hydrogen bonding. However, its hydrochloride form 3 crystallizes in the noncentrosymmetric space group Pc. It shows a three-dimensional network structure via intermolecular hydrogen bonding (N—H...C and N/C—H...Cl). Compound 3, with its acentric structure, shows strong second harmonic activity.
三种基于奎宁环的化合物的晶体结构,即 (1-azabicyclo[2.2.2]octan-3-ylidene)hydrazine monohydrate, C7H13N3-H2O (1)、1,2-bis(1-azabicyclo[2.2.2.2]octan-3-ylidene)hydrazine, C14H22N4 (2) 和 1,2-双(1-氮杂双环[2.2.2]辛烷-3-亚基)肼二氯化物,C14H24N4
2+-2Cl- (3)。在 1 的晶体结构中,喹啉取代的肼分子和水分子通过 N-H...O 和 O-H...N 氢键相连,形成一个二维阵列。该化合物在中心对称空间群 P21/c 中结晶。化合物 2 在 Pccn 空间群中精制,没有氢键。不过,其盐酸盐形式 3 在非中心对称空间群 Pc 中结晶。它通过分子间氢键(N-H...C 和 N/C-H...Cl)形成三维网络结构。化合物 3 具有偏心结构,具有很强的二次谐波活性。