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用脂肪伯胺和脂肪醛合成了希夫碱 ,用红外和紫外光谱对合成的希夫碱及希夫碱锡 (Ⅱ )配位化合物进行了表征。结果表明 ,希夫碱及其锡 (Ⅱ )配位化合物的红外光谱存在较大的差别 ,配体及配位化合物的νC =N吸收带分别出现在 1630 .0 1、162 6.63cm- 1处 ,峰位向低波段移动约 4cm- 1,吸收峰强度明显减弱 ;同时配位化合物在 4 5 5 .38cm- 1处出现了一种中等强度的吸收峰为νSn-N,从紫外光谱可知 ,希夫碱与锡 (Ⅱ )形成配位化合物后 ,2 73.6nm处的吸收峰消失 ,2 2 0nm处的吸收峰强度急剧增大。用可见分光光度法测定了希文碱在光亮镀锡溶液中的稳定性。实验结果表明 ,低温和SnSO4 可使该希夫碱的稳定性大为增加
Schiff bases were synthesized from fatty primary amines and aliphatic aldehydes. The synthesized Schiff base and Schiff base tin (Ⅱ) complexes were characterized by IR and UV spectroscopy. The results show that there is a big difference between the IR spectra of Schiff base and its tin (Ⅱ) coordination compound. The νC = N absorption bands of ligands and coordination compounds appear at 1630.1162.663cm-1 , The peak position to the low band shift of about 4cm-1, the absorption peak intensity was significantly reduced; at the same time the complex compound at 455 .38cm-1 appeared a moderate intensity absorption peak νSn-N, from the UV spectrum, Schiff base and tin (Ⅱ) form a coordination compound, the absorption peak at 2 73.6nm disappears, the intensity of the absorption peak at 220nm increases sharply. The stability of tinned alkali in bright tin-plating solution was determined by visible spectrophotometry. The experimental results show that the low temperature and SnSO4 make the Schiff base stability greatly increased