Syntheses, spectroscopy, and electrochemistry of high-valent osmium(V) and -(VI) oxo complexes of macrocyclic tertiary amine ligands
作者:Chi-Ming Che、Wing-Kin Cheng、Vivian Wing-Wah Yam
DOI:10.1039/dt9900003095
日期:——
acetonitrile, trans-[OsVIL(O)2]2+ displays reversible OsVI–OsV and Os V–OsIV couples with E⊖ ranging from –0.67 to –0.73 and –1.48 to –1.74 V vs. ferrocenium–ferrocene, respectively. The complexes trans-[ OsVL(O)2]+ have been characterized by u.v.–visible spectroscopy and magnetic susceptibility measurements. In aqueous solutions, pH-dependent and reversible OsVI–OsIII couples have been observed. Thermally
has已插入大环叔胺配体[L = 1,4,8,11-四甲基-1,4,8,11-四氮杂环十四烷,1,4,8,12-四甲基-1,4,8, 12-四氮杂环十五烷,1,5,9,13-四甲基-1,5,9,13-四氮杂环十六烷和内消旋-2,3,7,11,12-五甲基-3,7,11,17 -四氮杂双环[11.3.1] heptadeca-1(17),13,15-三烯]生成反式-[Os III LCl 2 ] +,可以将其氧化为反式-[Os VI L(O)2 ] 2+通过H 2 O 2。的反式- [O的VI L(O)2 ] 2+配合物在870–880 cm –1处显示出一个强烈的ν不对称(OsO 2)拉伸。他们的紫外-可见光谱显示了两个振动结构的电子吸收带,其中心在ca左右。310和350纳米,可分配给自旋允许和自旋禁阻(d XY)2 →(d XY)1(d π *)1个转变(d π * = d XZ ' d