Synthesis and thermal, emission and dielectric properties of liquid crystalline Eu(III), Sm(III) and Tb(III) complexes based on mesogenic 4-pyridone ligands functionalized with cyanobiphenyl groups
作者:Laura F. Chiriac、Paul C. Ganea、Doina Manaila Maximean、Iuliana Pasuk、Viorel Cîrcu
DOI:10.1016/j.molliq.2019.111184
日期:2019.9
New thermotropic lanthanidomesogens based on Eu(III), Sm(III) and Tb(III) with N-alkylated 4-pyridones mesogenic ligands, having two cyanobiphenyl groups attached via long alkoxy spacers, with 6, 9 and 10 carbons atoms in 3,5 - positions of a benzyl unit, have been designed and investigated. The liquid crystal behavior was assessed by differential scanning calorimetry, the mesophases being assigned
基于Eu(III),Sm(III)和Tb(III)和N-烷基化的4-吡啶酮类介晶配体的新型热致镧系元素基因,具有两个通过长烷氧基间隔基连接的氰基联苯基团,在3个碳原子中具有6、9和10个碳原子,已经设计和研究了苄基单元的5-位。通过差示扫描量热法评估液晶行为,通过偏光显微镜基于它们的特征织构分配中间相,并通过可变温度X射线粉末衍射分析确认中间相。三个N-烷基化的4-吡啶酮向列配体与硝酸镧系元素反应生成新的镧系元素致病菌,其在高达125°C的温度下具有稳定且可复制的近晶A相。配合物的发射光谱已经显示出镧系元素三价离子在SmA相直至整个各向同性状态的整个温度范围内的特征性发射。在液晶相存在的温度范围内(在低频(LF)域0.01–10 MHz和高频(HF)范围1 MHz–3 GHz中)执行的介电谱测量显示出三个偶极弛豫流程。通过将介电损耗谱与两个分量的Havriliak-Negami函数拟合,可