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在方酸内鎓盐中,四碳环的电荷分离使其氧原子带部分负电荷,成为潜在的良好配位基。 据此,作者于前文中合成了以双苯氨基方酸内鎓盐为骨架、苯环的2—位对称引入多甘醇醚氧 链的多齿配体,并以它们为萃取剂或电活性物质成功地实现了水相中UO_2~(2+)的萃取及碱水中NH_3 的测定。如果配基链由苯环的2—位移至N上,整个配体分子的几何及电子结构将发生改变, 四碳环上的氧与侧链的匹配情况也将不同。此外,苯环上的取代基将可能通过共轭体系直接影响 四碳环上氧的电荷状态及配位能力。因此,本文合成并研究了一类新的1,3—双(N—取代苯氨基) 方酸内鎓盐型多齿配体2(a～h)(见下式)。
In squaric acid ylides, the charge separation of the four-carbon ring makes the oxygen atom with a partial negative charge, which becomes a potential good ligand. According to the above, the authors synthesized the polydentate ligands with polylysine ether oxygen chain symmetrically at the 2-position of benzene ring as the backbone of the bisanilino acid squarylium in the previous article and use them as extractant or electroactive The material successfully achieved the extraction of UO_2 2+ in aqueous phase and the determination of NH_3 in alkaline water. If the ligand chain is shifted from the 2-position to the N-position of the benzene ring, the geometry and electronic structure of the entire ligand molecule will change and the oxygen and side chain matches on the four-carbon ring will also be different. In addition, the substituents on the benzene ring may directly affect the charge state and coordination ability of the oxygen on the four-carbon ring through the conjugated system. Therefore, a new class of 1,3-bis (N-substituted phenylamino) squarylium polydentate ligands 2 (a ~ h) has been synthesized and studied (see the following formula).