Experimental and Theoretical Approaches Toward Anion-Responsive Tripod–Lanthanide Complexes: Mixed-Donor Ligand Effects on Lanthanide Complexation and Luminescence Sensing Profiles
作者:Yumiko Kataoka、Dharam Paul、Hiroyuki Miyake、Tsuyoshi Yaita、Eisaku Miyoshi、Hirotoshi Mori、Shinya Tsukamoto、Hiroshi Tatewaki、Satoshi Shinoda、Hiroshi Tsukube
DOI:10.1002/chem.200701898
日期:2008.6.9
nitrogen plays a significant role in lanthanide complexation. The experimentally determined stability constants of complexes of the tripod with La(NO(3))(3), Eu(NO(3))(3), and Tb(NO(3))(3) were in good agreement with the theoretically calculated interaction energies. Complexation of each tripod with lanthanide triflate gave a mixture of several lanthanide complex species. Interestingly, the addition
设计了一系列新的三脚架,以形成对阴离子敏感的发光镧系元素络合物。这些三脚架包含吡啶,噻唑,吡嗪或喹啉发色团,并结合了酰胺羰基氧和叔氮原子。晶体学和EXAFS研究的10协调三脚架La(NO(3))(3)配合物表明,每个La(3+)阳离子是由一个四齿三脚架和三个二齿NO(3)(-)阴离子协同配位的。晶体,并在CH(3)CN中。量子化学计算表明,芳族氮在镧系元素络合中起重要作用。实验确定的三脚架与La(NO(3))(3),Eu(NO(3))(3)和Tb(NO(3))(3)的配合物的稳定常数与理论上计算出的相互作用能。每个三脚架与三氟化镧镧系元素的络合生成几种镧系元素络合物的混合物。有趣的是,向混合物中添加配位NO(3)(-)或Cl(-)阴离子显着影响了镧系元素的络合曲线。三脚架和发光Eu(3+)中心的特定组合提供了阴离子选择性发光增强功能。含吡啶的三脚架表现出最高的NO(3)(-)阴离子选择性发