Cubic Phase Formation and Interplay between Alkyl Chains and Hydrogen Bonds in 1,2-Bis(4′-n-alkoxybenzoyl)hydrazines (BABH-n)
Cubic Phase Formation and Interplay between Alkyl Chains and Hydrogen Bonds in 1,2-Bis(4′-n-alkoxybenzoyl)hydrazines (BABH-n)
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DOI：
10.1021/cm703684v
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发表时间：
2008-04
影响因子：
8.6
通讯作者：
S. Kutsumizu;H. Mori;Machiko Fukatami;Shigeharu Naito;Koichi Sakajiri;Kazuya Saito
中科院分区：
文献类型：
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作者：
S. Kutsumizu;H. Mori;Machiko Fukatami;Shigeharu Naito;Koichi Sakajiri;Kazuya Saito
采用差示扫描量热法（DSC）、偏光显微镜（POM）、X射线衍射（XRD）和红外光谱（FT-IR）研究了1，2-双（4′-n-烷氧基苯甲酰基）肼（BABH-n，n为烷基链上的碳原子数，n为4 ~ 22）的相变.双连续型立方（Cub）中间相的形成，观察到对映n ≥ 6和冷却n = 5。通过XRD检查结构，其揭示了具有对称性Ia 3d和Im 3 m的两种类型的存在，这取决于n，并且对于n = 13、15和16，观察到两个Cub相之间的相变。FT-IR研究表明，一个分子的C-O键与另一个分子的NH基团之间形成了分子间氢键，其结合强度与温度有关。立方晶格参数（da/dT）的温度依赖性变化从一个大的正到一个大的负v。
The phase transitions of a homologous series of 1,2-bis(4′-n-alkoxybenzoyl)hydrazines (BABH-n, where n is the number of carbon atoms in the alkyl chain and in this investigation varies from 4 to 22) were investigated by differential scanning calorimetric (DSC), polarizing optical microscopic (POM), X-ray diffraction (XRD), and infrared (FT-IR) measurements. The formation of bicontinuous type cubic (Cub) mesophases was observed enantiotropically for n ≥ 6 and only on cooling for n = 5. The structures were examined by XRD, which revealed the presence of two types with symmetries Ia3d and Im3m, depending on n, and for n = 13, 15, and 16, phase transitions between the two Cub phases were observed. The FT-IR studies elucidated the formation of intermolecular hydrogen bonding between the C═O bond of one molecule and the NH group of another molecule, whose binding strength was temperature-dependent. The temperature dependence of the Cub lattice parameter (da/dT) varied from a large positive to a large negative v...