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本文报道了新螯合剂N,N-双-羧甲基氨基乙酰蛋氨酸的合成。用pH滴定法在25±0.1℃,μ=0.1(KNO_3)下测定了它的酸解离常数(pk_a_1=2.452,pk_a_2=3.320,pk_a_3=6.799)及它与铟(Ⅲ)离子的螯合物生成常数(logK_(InL)=8.90,logK_(InL)_2=6.47,logβ_InL_2=15.37),还测定了螯合物在30±0.1℃及μ=0.1(KNO_3)时的水解常数(K_a=1.9×10~(-5)),并算出形成正常螯合物的最佳pH值约为4.8。对形成配合物的物种及配位原子作了初步的探讨。 相似文献
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The synthesis of N, N-bis-carboxymethylaminoacetomethionine was described. The acid dissociation constants and the formation constants of its indium (III) chelates at 25`C and \m\=0.1(KNO3) were determined (pka1=2.452, pka2=3.320, pka3=6.799; log KInL=8.90, log KInLi=6.47, log βInLi=15.37) by pH titration method. The hydrolysis constant of the chelate at 30`C was also given. The optimal pH for the formation of normal chelate was calculated to be about 4.8. In addition, the chelate species and coordinated atoms of the ligand were briefly discussed. 相似文献
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