Metal Complexes with Macrocyclic Ligands. Part XL. Syntheses and silver(I) complexes of mono- and disubstituted dithiadiazamacrocycles
作者:Pascale C. Riesen、Thomas A. Kaden
DOI:10.1002/hlca.19950780522
日期:1995.8.9
A series of N2S2-macrocycles with ring sizes varying between 12 and 16, as well as two 12-membered N2S2-rings with a pendant carboxylic and amino group, respectively, were synthesized. Their complexation properties towards Ag+ were studied by pH titrations and by potentiometry with a silver electrode. The observation that 1:1 ([AgLH2]3+, [AgLH]2+, [AgL]+) and 1:2 species ([AgL2H2]3+, [AgL2H]2+, [AgL2]+)
合成了一系列环大小在12至16之间的N 2 S 2-大环,以及两个分别带有羧基和氨基侧基的12元N 2 S 2-环。通过pH滴定和银电极电位法研究了它们对Ag +的络合性能。1:1([AgLH 2 ] 3+,[AgLH] 2 +,[AgL] +)和1:2物种([AgL 2 H 2 ] 3+,[AgL 2 H] 2 +,[AgL 2 ] +)的形成是通过假设Ag +可以仅与S-供体结合,也可以与N-和S原子结合来解释的。对于12元N 2 S 2环3,发现了一系列非官能化大环化合物中最稳定的复合物[AgL] +。当将另外的供体基团引入侧链时,其稳定性增加。最高形成常数(logβ 110 = 14.43(1))与12元环得到12携带乙胺侧链。考虑到放射化学的应用,所有Ag +配合物都在血清中进行了稳定性测试,但对金属转移的稳定性不够。