A new host tris[Nâ²-naphthyl-N-(2-aminoethyl)thiourea]amine (3) and the reference compounds bis[Nâ²-naphthyl-N-(2-aminoethyl)thiourea]amine (2) and Nâ²-naphthyl-N-n-amylthiourea (1) were synthesized and used for the recognition of anionic species. Considerable changes in UV/Vis absorption of host 3 induced by complexation with H2PO4â (or HSO4â) were observed. UV/Vis spectroscopy titration experiments and 1H-NMR results both indicated the formation of 1â¶1 stable complexes between 3 and H2PO4â (or HSO4â). The stability constants of the complexes were determined in DMF. The results demonstrate that optically changeable receptors for anions may be constructed by appropriate design of host molecules.
新主体三[N-
萘基-N-(2-
氨基乙基)
硫脲]胺 (3) 和参考化合物双[N-
萘基-N-(2-
氨基乙基)
硫脲]胺 (2) 和合成了 N-
萘基-N-正戊基
硫脲 (1) 并用于识别阴离子物质。观察到由与 H2PO4–(或 HSO4–)络合引起的宿主 3 的 UV/Vis 吸收发生显着变化。紫外/可见光谱滴定实验和1H-NMR结果均表明3与H2PO4-(或HSO4-)之间形成了1-1稳定络合物。复合物的稳定性常数在
DMF 中测定。结果表明,可以通过适当设计主体分子来构建阴离子的光学可变受体。