Synthesis, structural and magnetic properties of a series of copper(ii) complexes containing a monocarboxylated perchlorotriphenylmethyl radical as a coordinating open-shell ligand
pyridine) (5) were structurally characterized. In complexes 1, 2, 3 and 5, the copper(II) ion is coordinated to two PTMMC (or HPTMMC) units in a slightly distorted square planar surrounding, while 4 shows a paddle-wheel copper(II) dimer structure, where each Cu metal ion has four O atoms of different carboxylate groups, two of them belonging to two PTMMC radicals. The copper(II)–radical exchange couplings are
作为一系列新的含铜(II)的配合物,该配合物含有被羧基官能化的全氯三苯基甲基自由基配体被报道。化合物[Cu(PTMMC)2(L)3 ](PTMMC =(十四碳-4-羧基三苯基)甲基; L =(1)高氧2,(2)嘧啶 和 乙醇或(3)吡啶),[Cu 2(PTMMC)2(MeCOO)2(H 2 O)2 ](4)和[Cu(HPTMMC)2(L)3 ](HPTMMC =α- H-(十四氯三苯基)甲烷-4-羧酸酸; L =吡啶)(5)的结构特征。在配合物1,2,3和5中,铜(II)离子与两个PTMMC(或HPTMMC)单元中围绕稍微扭曲正方形平面,而4示出了桨轮铜(II)二聚物结构,其中每铜金属离子具有四个具有不同羧酸根基团的O原子,其中两个原子属于两个PTMMC自由基。铜(II) -基团交换耦合是反铁磁对配合物1,2和3。将线性三旋模型应用于复合物1,2和3分别给出J / k B = -24.9,-15
[60]Fullerene–perchlorotriphenylmethide anion triads. Synthesis and study of photoinduced intramolecular electron-transfer processes
作者:Stéphanie Chopin、Jack Cousseau、Eric Levillain、Concepció Rovira、Jaume Veciana、Atula S. D. Sandanayaka、Yasuyuki Araki、Osamu Ito
DOI:10.1039/b514882k
日期:——
For the first time an anionic donor, the perchlorotriphenylmethide anion (PTMâ), has been covalently bonded to C60, generating the C60â(PTMâ)2 triad that is reversibly oxidized to the corresponding C60âperchlorotriphenylmethyl radical triad C60â(PTMË)2. For the triad C60â(PTMâ)2, photoinduced charge-separation can be confirmed to occur via the excited singlet states of the C60 moiety and the PTM anion in polar and nonpolar solvents from quenching of their fluorescence intensities in the region of 700â750 nm and 560â630 nm, respectively. The charge-separation state was confirmed by the nanosecond transient absorption spectra in the visible and near-IR spectral regions. After charge-separation, back electron transfer takes place with a lifetime of about 80 ns. Steady-state concentration of the highly persistent PTM radical was observed after repeated laser light irradiation.