苯乙烯三嗪衍生物的合成及在重金属离子识别中的应用

合成了2,4-二(2-噻吩乙烯基)-6-(4'-N,N-二甲氨基苯乙烯基)-1,3,5-均三嗪(2)并鉴定了其结构。在乙腈-水混合介质中,化合物2在355和416nm处呈现双吸收峰,加入Cu²⁺,Hg²⁺ 和Fe³⁺ 后,均在520nm附近形成新的吸收峰。化合物2与Cu²⁺、Hg²⁺ 和Fe³⁺ 均形成1:1型配合物,其结合常数分别为1.9×10⁵L·mol^-1,6.6×10³L·mol^-1,2.7×10³L·mol^-1。对照化合物4与金属离子的光谱响应与化合物2相似,仅吸收峰的位置不同。因此,可认为化合物2和4中三嗪环中的N和噻吩环中的S与Cu²⁺、Hg²⁺ 和Fe³⁺ 共同配位形成了稳定的金属配合物。

Synthesis of s-Triazine Derivatives and Application of Heavy Metal Ions Recognition

Anew compound, namely 2,4-di(2-thiazole)-6-2-(4-N,N-dimethylamino)phenylethenyl]-1,3,5-s-triazine (2), was synthesized and fully characterized. Compound 2 displayed double absorption peaks at 355 and 416 nm in the acetonitrile-water mixed medium. In the presence of various metal ions, a new absorption band peaking at 520 nm was appeared for Cu²⁺, Hg²⁺ and Fe³⁺ ions. The binding stoichiometry of compound 2 with Cu²⁺, Hg²⁺ and Fe³⁺ ions was 1:1 and the association constants were 1.9×10⁵, 6.6×10³ and 2.7×10³L·mol^-1, respectively. Compound 4 exhibited similar spectral response to metal ions with compound 2. The binding mode for compounds 2 with these heavy metal ions was investigated using ₁H NMRspectral titration as well. The results suggested that Cu²⁺, Hg²⁺ and Fe³⁺ ions coordinated with the Natom of the triazine and the Satom of thiophene cooperatively.