Improved syntheses, structures, spectral and electrochemical properties of [Mn<sub>2</sub><sup>III</sup>(µ-O)(µ-O<sub>2</sub>CMe)<sub>2</sub>L<sub>2</sub>]<sup>2+</sup>and [Mn<sub>2</sub><sup>IV</sup>(µ-O)<sub>3</sub>L<sub>2</sub>]<sup>2+</sup>complexes. Two homologous series derived from eight N-substituted 1,4,7-triazacyclononanes
作者:Jean H. Koek、Stephen W. Russell、Lodewijk van der Wolf、Ronald Hage、Johann B. Warnaar、Anthony L. Spek、Judy Kerschner、Lisa DelPizzo
DOI:10.1039/dt9960000353
日期:——
A series of eight N-substituted 1,4,7-triazacyclononanes L has been prepared having combinations of hydrogen, methyl, ethyl or propyl substituents on the three nitrogens. From the monoprotonated macrocycles dinuclear manganese complexes [Mn2III(µ-O)(µ-O2CMe)2L2]X2(X = ClO4 or PF6) were prepared under anhydrous conditions in high yield. A relationship between the absorption bands and the electrochemical
已经制备了一系列八个N-取代的1,4,7-三氮杂环壬烷L,在三个氮原子上具有氢,甲基,乙基或丙基取代基的组合。从单质子化的大环化合物的双核锰配合物[锰2 III(μ-O)(μ-O 2 CME)2大号2 ] X 2(X = CLO 4或PF 6)以高收率无水的条件下制备。已经观察到含有各种甲基取代的L的配合物的吸收带与电化学性质之间的关系。从Me x Et 3– x-和Pr 3从L,锰(II)盐和抗衡离子开始,制备取代的大环三氧桥连的双核双锰锰配合物[Mn 2 IV(µ-O)3 L 2 ] 2+,然后用碱性过氧化氢处理。该反应的产率取决于大环上N处的取代基的大小。[Mn 2 IV(μ-O)3 L 2 ] [PF 6 ] 2 ·0.5KPF 6的晶体结构已确定(L = 1,4,7-三甲基-1,4,7-三氮杂环壬烷)。这揭示了该核几乎与已知的三乙基类似物的核相同,其中乙基取代基的甲基朝外指向以最小化空间相互作用。Mn-Mn距离为2