Synthesis and characterization of a novel (E,E)-dioxime and its mono- and heterotrinuclear complexes containing a 21-membered trioxadithiadiaza macrocycle
作者:Halit Kantekin、Özden Hasançebi、Rıza Abbasoglu、Yaşar Gök
DOI:10.1039/b004623j
日期:——
A new (E,E)-dioxime (H4L) containing a 21-membered trioxadithiadiaza macrocycle was synthesized from the reaction of
2,3:17,18-dibenzo-4,16-dithia-7,10,13-trioxa-1,19-diazanonadecane (2), prepared from 3,6,9-trioxa-1,11-dibromoundecane (1) and 2-aminothiophenol, and cyanogendi-N-oxide. Only mononuclear Ni(II) and Co(III) complexes with a metal : ligand ratio of 1 : 2 were isolated. These hydrogen-bridged complexes were converted to their BF2+-bridged analogues by reaction with boron trifluoride etherate. The reaction of the BF2+-bridged complexes with Pd(II) and Ni(II) gave heterotrinuclear complexes. These compounds are significant in that they provide binding sites not only within but also outside the macrocycles. Structures for the dioxime and its complexes are proposed in accordance with the elemental analysis, 1H and 13C NMR, IR and mass spectral data, magnetic susceptibility measurements and semi-empirical quantum chemical calculations.
由 3,6,9- 三氧杂-1,11-二溴十一烷 (1) 和 2-氨基苯硫酚制备的 2,3:17,18-二苯并-4,16-二硫杂-7,10,13-三氧杂-1,19-二氮杂十一烷 (2) 与氰基二-N-氧化物反应合成了一种含有 21 元三氧二噻二氮杂大环的新 (E,E)-dioxime (H4L)。只分离出金属与配体比例为 1 : 2 的单核 Ni(II) 和 Co(III) 复合物。通过与三氟化硼醚酸盐反应,这些氢桥联配合物被转化为 BF2+桥联类似物。BF2+ 桥接络合物与钯(II)和镍(II)反应生成了异核络合物。这些化合物不仅在大环内,而且在大环外都提供了结合位点,因此意义重大。根据元素分析、1H 和 13C NMR、IR 和质谱数据、磁感应强度测量以及半经验量子化学计算,提出了二恶英及其配合物的结构。