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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Counter-ligand control of the electronic structure in dinuclear copper-tetrakisguanidine complexes
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Counter-ligand control of the electronic structure in dinuclear copper-tetrakisguanidine complexes

机译:双核铜-四胍胍配合物中电子结构的反配体控制

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摘要

The redox-active GFA (Guanidino-Functionalized Aromatic compound) 1,4,5,8-tetrakis(tetramethyl-guanidino)-naphthalene (6) is used to synthesize new dinuclear copper complexes of the formula [6(CuX2)(2)] with different electronic structures. With X = OAc, a dinuclear Cu-II complex of the neutral GFA is obtained (electronic structure [Cu-II-GFA-Cu-II], two unpaired electrons), and with X = Br a diamagnetic dinuclear Cu-I complex of the dicationic GFA (electronic structure [Cu-I-GFA(2+)-Cu-II], closed-shell singlet state). The different electronic structures lead to significant differences in the optical, structural and magnetic properties of the complexes. Furthermore, the complex [6(CuI)(2)](2+) (electronic structure [Cu-I-GFA(2+)-Cu-I], closed-shell singlet state) is synthesized by reaction of 6(2+) with two equivalents of CuI. Slow decomposition of this complex in solution leads to the fluorescent dye 2,7-bis(dimethylamino)-1,3,6,8-tetraazapyrene. In an improved synthesis of this tetraazapyrene, 6 is reacted with CuBr in the presence of dioxygen. Quantum chemical calculations show that the addition of counter-ligands to the trigonal planar Cu-I atoms of [6(CuI)(2)](2+) favors or disfavors one of the electronic structures, depending on the nature of the counter-ligand.
机译:具有氧化还原活性的GFA(胍基官能化的芳族化合物)1,4,5,8-四(四甲基-胍基)-萘(6)用于合成新的式[6(CuX2)(2)的双核铜配合物]具有不同的电子结构。 X = OAc时,获得中性GFA的双核Cu-II配合物(电子结构[Cu-II-GFA-Cu-II],两个不成对的电子),X = Br时,获得抗磁性的双核Cu-I配合物。专用GFA(电子结构[Cu-I-GFA(2 +)-Cu-II],闭壳单重态)。不同的电子结构导致配合物的光学,结构和磁性性质显着不同。此外,复合物[6(CuI)(2)](2 +)(电子结构[Cu-I-GFA(2 +)-Cu-I],闭壳单线态)是通过6(2)的反应合成的+)和两个等价的CuI。该络合物在溶液中的缓慢分解产生荧光染料2,7-双(二甲基氨基)-1,3,6,8-四氮杂ap。在该四氮杂ap的改进的合成中,在双氧的存在下使6与CuBr反应。量子化学计算表明,根据反荷分子的性质,将反配体添加到[6(CuI)(2)](2+)的三角形平面Cu-I原子中会有利于或不利于一种电子结构。配体。

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