A series of closely related tetrasubstituted derivatives of benzo[c]cinnoline (1), tetraazapyrene (2), phenanthrene (3), and pyrene (4) were investigated for their mesogenic properties using thermal, optical, spectroscopic, and powder XRD analyses. Only three 3,4-dioctyloxyphenyl derivatives exhibited mesogenic properties. Substitution of N for CH (3
→
1 and 4
→
2 pairs) and also increase of the core element size (1
→
2 and 3
→
4 pairs) significantly increases the mesophase stability. The findings and observed trends were rationalized by analysis of conformational properties which included calculation of the planarization energy, and modeling of aliphatic chain density and fill fractions. MO calculations showed that the tetraaza derivative 2c is significantly electron deficient and suitable for electron conductive materials.
一系列密切相关的四取代苯并[c]
吡咯啉(1)、四烯氮(2)、
菲(3)和
芘(4)衍
生物的介质性质通过热学、光学、光谱及粉末XRD分析进行了研究。只有三种3,4-二辛氧基苯衍
生物表现出了介质特性。将N替换为CH(3→1和4→2对)以及核心元素尺寸的增加(1→2和3→4对)显著提高了相位稳定性。研究结果及观察到的趋势通过对构象特性的分析进行了合理化,包括平面化能量的计算,以及脂肪链密度和填充分数的建模。分子轨道计算显示,四氮衍
生物2c显著缺电子,适合用于电子导电材料。