Thermal and Emission Properties of a Series of Lanthanides Complexes with N-Biphenyl-Alkylated-4-Pyridone Ligands: Crystal Structure of a Terbium Complex with N-Benzyl-4-Pyridone
作者:Florentina L. Chiriac、Monica Iliş、Augustin Madalan、Doina Manaila-Maximean、Mihail Secu、Viorel Cîrcu
DOI:10.3390/molecules26072017
日期:——
luminescence properties of the lanthanide complexes of Eu(III), Sm(III) and Tb(III) with N-biphenyl-alkylated-4-pyridone ligands. The organic ligands having a biphenyl group attached via a long flexible spacer with either 9 or 10 carbon atoms were synthesized by the reaction between 4-hydroxypyridine and the corresponding bromide compounds. The chemical structures of the organic and lanthanide complexes were
这项工作专注于研究Eu(III),Sm(III)和Tb(III)与N-联苯基烷基化的4-吡啶酮配体的镧系元素配合物的液晶行为和发光特性。通过4-羟基吡啶和相应的溴化物化合物之间的反应,合成了具有通过长的柔性间隔基与9个或10个碳原子连接的联苯基的有机配体。根据元素分析,单晶X射线衍射,1 H,13分配有机和镧系元素配合物的化学结构13 C NMR和IR光谱,以及热重分析(TGA)。母体化合物的X射线衍射分析表明,镧系元素离子被三个单齿吡啶酮配体和三个二齿硝酸根离子包围,从而形成9坐标的环境。通过差示扫描量热法(DSC)和偏振光学显微镜(POM)以及粉末X射线衍射(XRD)研究分析了新配合物表现出的介晶行为和液晶相类型。仅具有较长间隔基(10)的镧系元素络合物显示出单向性SmA相,通常在较短的热范围内(低于10°C)。具有较短柔性链的配合物(9)的熔融温度低于具有较长间隔基的类似物时,没有显示液晶性质。