【摘要】 用~1HNMR方法研究了溶液中大环化合物1,12-二氮杂-3,4:9,10-二本并-5,8-二氧杂环十五烷-N,N’-二乙酸盐的构象.NMR变温实验表明,在溶液中大环与Zn(Ⅱ)、Ni(Ⅱ)、Co(Ⅱ)的配合物环上醚氧不参与配位,其中Ni(Ⅱ)配合物为低自旋反磁性的平面四方形配位.更多还原

【Abstract】 The 1H NMR spectra of 1, 12-diaza-3, 4-: 9, 10-dibenzo-5, 8-dioxacy-clopentadencane-N, N’-diacetic acid (sodium salt) and its complexes in solution are reported. Two sets of three split peaks have been observed in the low temperature NMR spectra of the macrocycle, which is related to the nonequivalence of 1- and 2- protons on the conformation of the macrocyclic ligand. The 1H NMR spectra of the nickel complex is very similar to those of the zinc complex. This can be interpreted as a low-spin, square plannar molecular structure of the nickel complex. For all of the zinc, nickel and cobalt complexes, the ether oxygen atoms in the macrocyclic ligand do not coordinate to the central metal ion.更多还原