Structural characterization of cobalt(III), nickel(II), copper(II) and iron(III) complexes of tetraazamacrocycles with N-carboxymethyl arms
作者:Judite Costa、Rita Delgado、Michael G. B. Drew、Vitor Félix、Rui T. Henriques、João C. Waerenborgh
DOI:10.1039/a904263f
日期:——
molecule has a centrosymmetric structure with the centre of the core, Ca2O2, localised on a crystallographic inversion centre. Additionally, the complexes of H3L3 (3 and 4) have interesting superstructures based on several CO· · ·HO hydrogen interactions between the carboxylate pendant arms and water molecules. The Fe3+ complexes of H2L2 (3,11-bis(carboxymethyl)-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17)
[CoL 1 ] Br 0.5 ·[NO 3 ] 0.5 ·5H 2 O 1 [[Ni(HL 1)] Br·4H 2 O 2,Ca [CuL 3 ] NO 3 ·CH 3 CN·测定了2H 2 O 3和[CoL 3 ]·2H 2 O 4,其中H 2 L 1为3,11-双(羧甲基)-7-甲基-3,7,11,17-四氮杂双环[11.3.1] heptadeca-1(17),13,15-三烯和H 3 L 3是3,7,11-三(羧甲基)-3,7,11,17-四氮杂双环[11.3.1] heptadeca-1(17),13,15-三烯。在所有这些络合物中,金属中心被大环包裹在扭曲的八面体环境中,四氮杂环的四个氮原子定义了赤道面。在H 2 L 1的配合物中,轴向位置被与吡啶环相邻的两个羧甲基占据,而在H 3 L 3的配合物中这些位置之一被一个与吡啶环相邻的羧甲基臂占据,另一个被与吡啶部分相对的基团占据