均三嗪衍生物应用于Fe3+和Cu2+的选择性识别研究

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.

Synthesis of s-Triazine Derivatives and Using as Colorimetric Probe for Selective Recognizing of Fe3+ and Cu2+

In this paper,two compounds of s-triazine derivatives which named 2,4-dimethyl-6-(4’-N,Ndimethylamino)phenylethenyl]-1,3,5-s-triazine(1) and 2-styryl-4,6-dimethyl-1,3,5-triazine(2) were synthesized and characterized by 1H NMR,MS and elemental analysis.The interactions between the metal ions and compounds 1～3 were investigated by UV-vis spectroscopy.Results indicated that the absorption spectrum of compound 1 had a remarkable change when it combined with Fe3+ and Cu2+,and the maximum absorption peaks shifted from 393 nm to 525 nm and 513 nm,respectively.The models of compound 1 intergraded with Fe3+ and Cu2+ were 1∶1 and 2∶1,respectively,but with the same remarkable color change from yellow to pink by naked-eye colorimetric detection.The association constants of 1-Fe3+ and 1-Cu2+ were 1.8×104 L mol-1 and 2.6×1010 L mol-1 respectively.Meanwhile,the spectrum of compound 2 underwent distinct change when it combined with Fe3+ and the maximum absorption peak shifted from 304 nm to 357 nm.But less change was observed when it intergraded with Cu2+.The ratio of compound 2 intergraded with Fe3+ was 1∶1 and the association constants was 1.0×105 L mol-1.Therefore,we could concluded that Fe3+ combined with the ring of triazine of the compounds 1 and 2,but the Cu2+ intergraded with N atom of the methylamino of the compound 1.At the same time,the interactions of compounds 1 and 2 with other ions such as Li+,K+,Mg2+,Ca2+,Co3+,Ni2+,Ag+,Cd2+,Hg2+and Zn2+ were also investi-gated,but obvious absorption spectral changes was not observed.Thus a new kind chemosensor for Fe3+ and Cu2+with high selectivity and sensitivity was introduced.