Wide-Range Columnar and Lamellar Photoluminescent Liquid-Crystalline Lanthanide Complexes with Mesogenic 4-Pyridone Derivatives
作者:Laura F. Chiriac、Iuliana Pasuk、Mihail Secu、Marin Micutz、Viorel Cîrcu
DOI:10.1002/chem.201801781
日期:2018.9.12
series of liquid crystals with various lanthanide ions (EuIII, SmIII, and TbIII) was designed and prepared starting from the corresponding lanthanide nitrates and N‐alkylated 4‐pyridone derivatives bearing mesogenic 3,4,5‐tris(alkyloxy)benzyl moieties (alkyl=hexyl, octyl, decyl, dodecyl, tetradecyl, or hexadecyl). These new lanthanidomesogens were investigated for their mesogenic properties by a combination
各种镧系元素离子(Eu等,作为系列液晶的III,SM III和Tb III)的设计,并从相应的镧系元素硝酸盐和开始制备Ñ带有介晶的3,4,5-三(烷氧基)苄基部分的烷基化的4-吡啶酮衍生物(烷基=己基,辛基,癸基,十二烷基,十四烷基或十六烷基)。通过差示扫描量热法,偏光光学显微镜和温度依赖性粉末X射线衍射(XRD)的组合研究了这些新的镧系元素基因元的介晶性质。通过热重分析评估它们的热稳定性。所有这些配合物在较短链的配合物(C 6和C 8)或六方柱状相(Col h)的情况下均具有层状(SmA)相的对映体液晶行为,而对于具有较长烷基链的配合物(C 12,C 14和C 16),根据它们的特征纹理和XRD研究进行分配。对于在侧链(C 10)具有中等碳原子数的配合物,在较低温度下为层状相,在较高温度下为Col h相。在固态下,所有这些络合物都显示出分配给相应镧系元素离子的特征性发射。此外,发光衰减曲