Helicity interchange in the cadmium(II), mercury(II) and lead(II) complexes of two isomeric pendant arm tetraaza macrocyclic ligands
作者:Ashley K.W. Stephens、Ramesh Dhillon、Stephen F. Lincoln、Kevin P. Wainwright
DOI:10.1016/0020-1693(95)04627-l
日期:1995.8
In aqueous 0.10 mol dm−3 NEt4ClO4 at 298.2 K the complexes formed by Cd2+, Hg2+ and Pb2+ with the isomeric ligands N,N′,N′′,N′′′-tetrakis(2-methoxyethyl)-1,4,7,10-tetraazacyclododecane (TMEC-12) and N,N′,N′′,N′′′-tetrakis ((S)-2-hydroxyp ropyl)-1,4,7,10-tetraazacyclododecane (S-THPC-12) are characterized by log K (dm3 mol−1)=12.6, 18.57 and 14.9, and 14.47, 18,63 and 14.74 where the first and second
在298.2 K下的0.10 mol dm -3 NEt 4 ClO 4水溶液中,Cd 2 +,Hg 2+和Pb 2+与异构体配体N,N ',N '',N '''-四(4)形成络合物(2 -甲氧基乙基)-1,4,7,10-四氮杂环十二烷(TMEC-12)和N,N ',N '',N '''-四((S)-2-羟基对乙酰基)-1,4,7 ,10-四氮杂环十二烷(S -THPC-12)的特征在于log K(dm 3 mol -1)= 12.6、18.57和14.9,以及14.47、18.63和14.74,其中第一个和第二个三项值分别是[M(TMEC-12)] 2+和[M(S -THPC-12)] 2+,K分别是每个络合物的稳定常数。在富含12 C的d 4-甲醇中,[M(TMEC-12)] 2+的13 C NMR光谱的温度依赖性聚结与其特征在于k(298.2 K)= 4130、4570和565 s -1