离子浮选法对Co(Ⅱ)-P_2O_7^(4-)-月桂胺三元配合物的研究

STUDY ON COBALT(Ⅱ) -PYROPHOSPHATE-LAURIC AMINE TERNARY COMPLEXES BY ION FLOTATION

用一种新的分离方法-离子浮选法对Co(Ⅱ)-P_2O_7^(4-)-月桂胺(C_(12)H_(25)NH_2)三元配合物进行了研究.利用摩尔比法和斜率比法测得在实验浓度范围内,生成两种颜色很浅的配合物,其组成为[Co(P_2O_7)]·[RNH_3]_2和[Co(P_2O_7)_2]·[RNH_3]_6.在25±0.5℃,μ=0.1(NaNO_3)条件下,利用Bjerrum-Rossotti作图法求得Co(Ⅱ)-P_2O_7^(4-)lgβ_1=6.19,该值与文献值十分吻合.并获得lgβ_2=10.69.采用微机统计分析,得到与作图法一致的结果.本文给出两种三元配合物结构,指出月桂胺中N未参加配位,红外光谱,核磁共振波谱及电子光谱支持上述结论.

The complexes of cobalt(Ⅱ)-pyrophosphate with cationic surfactant lauric amine by ion flotation method are systemeticaly investigated. The composition ratio of RNH3+ and Co(P2O7)nz- in complexes are determined by the molar ratio method and slope ratio method. Furthemore, the existances of [Co(P2O7)][RNH3+]2 and [Co(P2O7)2][RNH3+]6 are proved in the ternary complex solution. In all experimental, the temperature is held at 25±0.5℃, ion strength kept at 0.1 (NaNO3). The logarithms of the over-all stability constants β1, and β2 obtained with the graphic method are 6.19 and 10.69 respectively. And, the β1 value agrees with that had been reported in literature. The experimental data were treated with the statistical procedure on the computer, the result is rigidly unamimous with the graphic method. The structures of the complex compounds are described by the IR, NMR and UV-Vis spectrophotometry as well. It indicates that the N atom of lauric amine do not coordinate with the cobalt ion.