Luminescent palladium(II) metallomesogens based on cyclometalated Schiff bases and N -benzoyl thiourea derivatives as co-ligands
作者:Monica Iliş、Marin Micutz、Viorel Cîrcu
DOI:10.1016/j.jorganchem.2017.03.015
日期:2017.5
and C phases). The palladium(II) complexes are thermally stable on a broad temperature range up to about 220 °C. Interestingly, when the number of alkoxy groups on the BTU ancillary ligands was increased, the corresponding palladium(II) complexes lost their mesogenicity and only melting to the isotropic state was observed. The solid-state emission spectra of palladium(II) complexes show two maxima around
设计并制备了基于席夫碱和N-苯甲酰硫脲(BTU)配体的发光环金属化钯(II)配合物,在它们的外围具有不同数目的烷氧基。BTU配体以去质子化的二齿形式通过O和S原子进行配位,如IR和NMR光谱数据所证实。此外,给出BTU配体的不对称结构,11 H-NMR表明仅存在两种可能的异构体之一。通过偏振光学显微镜(POM)和差示扫描量热法(DSC)的组合研究了这些钯(II)配合物的液晶行为,同时通过热重分析(TGA)研究了它们的热稳定性。钯(II)配合物的介晶行为取决于接枝在BTU衍生物(单向近晶A和C相)上的烷氧基的数量和链长。钯(II)配合物在高达约220°C的宽温度范围内具有热稳定性。有趣的是,当BTU辅助配体上的烷氧基数量增加时,相应的钯(II)配合物失去了介晶性,仅观察到熔融至各向同性状态。