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多氮杂大环的配位化学一直是人们感兴趣的领域。近年来,人们努力把支链配位基团引入大环中,以便得到同时具有相对刚性和动力学稳定性的大环结构单元和具有相对柔性和动力学活性的开链结构单元的新型配体。我们曾通过简单的立体化学选择合成得到一系列部分N-乙酸取代六甲基四氮杂大环。本文报道新的大环配体c-meso-meso-5,12-二苯基-7,14-二甲基-1,4,8,11-四氮杂环十四烷-N,N″-二乙酸(H_2L~3及其镧系配合物的合成和表征。
The coordination chemistry of polyazamacrocycles has always been a field of interest. In recent years, efforts have been made to introduce branched-chain coordination groups into the macrocycle in order to obtain novel macrocyclic structural units having both relative rigidity and kinetic stability and novel ligands having relatively flexible and kinetic open-chain structural units . We have synthesized a series of partial N-acetic acid-substituted hexamethyltetrazole macrocycles by simple stereochemistry. The new macrocyclic ligand c-meso-meso-5,12-diphenyl-7,14-dimethyl-1,4,8,11-tetraazacyclotetradecane-N, N " - Diacetic Acid (Synthesis and Characterization of H_2L ~ 3 and Its Lanthanide Complexes.