论文部分内容阅读
合成了2,4-二甲基-6-(4’-N,N-二甲氨基苯乙烯基)-1,3,5-均三嗪(1)和2-苯乙烯基-4,6-二甲基-1,3,5-均三嗪(2)两种化合物,并对其进行了1H NMR,MS,元素分析等表征.采用吸收光谱法研究了金属离子与化合物间的相互作用,结果显示:化合物1对Fe3+和Cu2+表现出高选择性光谱响应,其最大吸收波长由393 nm分别红移至525 nm和513 nm,溶液颜色由黄色变为粉红色.化合物1与Fe3+结合形成1∶1型配合物,其结合常数为1.8×104L mol-1;与Cu2+结合形成2∶1型配合物,其结合常数为2.6×1010L mol-1.化合物2仅对Fe3+呈现显著的光谱变化,其最大吸收波长由304nm红移至357 nm,而Cu2+的加入未引起光谱明显变化,2与Fe3+亦形成1∶1型配合物,结合常数为1.0×105L mol-1.结果表明Fe3+可能与化合物1和2中三嗪N配位,而Cu2+与化合物1中甲氨基中的N配位.同时考察了其它金属离子如Li+,K+,Mg2+,Ca2+,Co3+,Ni2+,Ag+,Cd2+,Hg2+和Zn2+等离子对化合物1和2吸收光谱的影响,结果显示两者光谱均无明显变化,据此提出了高选择性Fe3+,Cu2+的识别体系.
2,4-dimethyl-6- (4’-N, N-dimethylaminostyryl) -1,3,5-s-triazine (1) and 2-styryl- -dimethyl-1,3,5-s-triazine (2) were synthesized and characterized by 1H NMR, MS and elemental analysis. The interaction between metal ions and compounds was studied by absorption spectroscopy The results showed that compound 1 exhibited highly selective spectral response to Fe3 + and Cu2 +, and its maximum absorption wavelength was red-shifted from 393 nm to 525 nm and 513 nm, respectively. The color of the solution changed from yellow to pink. Compound 1 formed with Fe3 + 1: 1 complex with a binding constant of 1.8 × 104 L mol-1. The 2: 1 complex was formed with Cu2 + and its binding constant was 2.6 × 1010 L mol-1. Compound 2 exhibited significant spectral changes only for Fe3 + , And its maximum absorption wavelength was red-shifted from 304 nm to 357 nm. However, the addition of Cu2 + did not change the spectrum significantly, and the formation of a 1: 1 complex with Fe3 + also showed a binding constant of 1.0 × 105 L mol- 1. The results showed that Fe3 + The complexes of triazine N in compounds 1 and 2 and the coordination of Cu2 + with N in the methylamino group in compound 1. The effects of other metal ions such as Li +, K +, Mg2 +, Ca2 +, Co3 +, Ni2 +, Ag +, Cd2 +, Hg2 + Zn2 + plasma to compound 1 2 Absorption spectra showed no significant change in both the spectrum, is proposed whereby high selectivity Fe3 +, Cu2 + identification system.