Monoribbed-functionalized (i.e. functionalization of only one of the three α-dioximate fragments) clathrochelate iron(II) tris-dioximates have been synthesized starting from the dichloride precursor FeBd2(Cl2Gm)(BF)2 (where Bd2â and Cl2Gm2â are α-benzyldioxime and dichloroglyoxime dianions, respectively), obtained by condensation of the macrocyclic iron(II) bis-α-benzyldioximate [FeBd2(BF2)2(MeCN)2] with H2Cl2Gm. Thioalkyl, alkylamine, oxo- and azaoxocrown ether clathrochelates, as well as the bis-clathrochelate with a 1,5-diaminopentane bridging fragment, have been characterized using elemental analysis, PD mass, IR, UV-vis, 57Fe Mössbauer and 1H, 13C and 11B NMR spectroscopies, and X-ray crystallography [for the FeBd2(Cl2Gm)(BF)2·2C6H6,
FeBd2(Et2N)ClGm}(BF)2·C6H6 and FeBd2(MeS)2Gm}(BF)2 complexes]. Configurations intermediate between trigonal prismatic and trigonal antiprismatic have been deduced for the low-spin iron(II) ion coordination polyhedra of the monoribbed-functionalized clathrochelates using 57Fe Mössbauer parameters. The products of de- and re-alkylation reactions of the methylthiol complex FeBd2(MeS)2Gm}(BF)2 have been identified. The correlation of E1/2 values for Fe3+/Fe2+ couples (from cyclic voltammograms) with Hammett Ïpara constants for substituents in the functionalized fragments is discussed.
从二
氯化物前体 FeBd2的三-二氧杂环
铁(II)的合成始于二
氯前体 FeBd2(Cl2Gm)(BF)2(其中 Bd2â 和 Cl2Gm2â 分别为δ-苄基二氧杂环
肟和二
氯二氧杂环
肟二离子)、),由大环双δ-苄基二氧杂环
铁[FeBd2(
BF2)2(MeCN)2]与 H2Cl2Gm 缩合而成。对于 FeBd2(Cl2Gm)(BF)2Â-2 、FeBd2(Et2N)ClGm}(BF)2Â-
C6H6 和 FeBd2(MeS)2Gm}(BF)2 复合物,则使用了元素分析、PD 质量、红外光谱、紫外-可见光谱、57Fe M¶ssbauer、1H、13C 和 11B NMR 光谱以及 X 射线晶体学对其进行了表征]。利用 57Fe M¶ssbauer参数,推导出了单
硼官能化螯合物的低自旋
铁(II)离子配位多面体介于三棱柱形和三棱柱形之间的构型。确定了
甲硫醇复合物 FeBd2(MeS)2Gm}(BF)2 的去烷基化和再烷基化反应产物。讨论了 Fe3+/Fe2+ 偶合的 E1/2 值(来自循环伏安图)与官能化片段中取代基的 Hammett Ïpara 常量的相关性。